highlight_string

(PHP 4, PHP 5, PHP 7, PHP 8)

highlight_string — Syntax highlighting of a string

Description

highlight_string(string $string, bool $return = false): string|bool

Outputs or returns html markup for a syntax highlighted version of the given PHP code using the colors defined in the built-in syntax highlighter for PHP.

Parameters

string: The PHP code to be highlighted. This should include the opening tag.
return: Set this parameter to true to make this function return the highlighted code.

Return Values

If return is set to true, returns the highlighted code as a string instead of printing it out. Otherwise, it will return true on success, false on failure.

Changelog

Version	Description
8.3.0	The resulting HTML has changed.

Examples

Example #1 highlight_string() example

<?php
highlight_string('<?php phpinfo(); ?>');
?>

The above example will output:

<code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php phpinfo</span><span style="color: #007700">(); </span><span style="color: #0000BB">?&gt;</span>
</span>
</code>

Output of the above example in PHP 8.3:

<pre><code style="color: #000000"><span style="color: #0000BB">&lt;?php phpinfo</span><span style="color: #007700">(); </span><span style="color: #0000BB">?&gt;</span></code></pre>

Notes

Note:
When the return parameter is used, this function uses internal output buffering so it cannot be used inside an ob_start() callback function.

The HTML markup generated is subject to change.

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User Contributed Notes 29 notes

down

stanislav dot eckert at vizson dot de ¶

8 years ago

You can change the colors of the highlighting, like this: 

<?php
ini_set("highlight.comment", "#008000");
ini_set("highlight.default", "#000000");
ini_set("highlight.html", "#808080");
ini_set("highlight.keyword", "#0000BB; font-weight: bold");
ini_set("highlight.string", "#DD0000");
?>

Like you see in the example above, you can even add additional styles like bold text, since the values are set directly to the DOM attribute "style".

Also, this function highlights only text, if it begins with the prefix "<?php". But this function can highlight other similar formats too (not perfectly, but better than nothing), like HTML, XML, C++, JavaScript, etc. I use following function to highlight different file types and it works quite good:

<?php
function highlightText($text)
{
    $text = trim($text);
    $text = highlight_string("<?php " . $text, true);  // highlight_string() requires opening PHP tag or otherwise it will not colorize the text
    $text = trim($text);
    $text = preg_replace("|^\\<code\\>\\<span style\\=\"color\\: #[a-fA-F0-9]{0,6}\"\\>|", "", $text, 1);  // remove prefix
    $text = preg_replace("|\\</code\\>\$|", "", $text, 1);  // remove suffix 1
    $text = trim($text);  // remove line breaks
    $text = preg_replace("|\\</span\\>\$|", "", $text, 1);  // remove suffix 2
    $text = trim($text);  // remove line breaks
    $text = preg_replace("|^(\\<span style\\=\"color\\: #[a-fA-F0-9]{0,6}\"\\>)(&lt;\\?php&nbsp;)(.*?)(\\</span\\>)|", "\$1\$3\$4", $text);  // remove custom added "<?php "

    return $text;
}
?>

Note, that it will remove the <code> tag too, so you get the formatted text directly, which gives you more freedom to work with the result.

I personally suggest to combine both things to have a nice highlighting function for different file types with different highlight coloring sets:

<?php
function highlightText($text, $fileExt="")
{
    if ($fileExt == "php")
    {
        ini_set("highlight.comment", "#008000");
        ini_set("highlight.default", "#000000");
        ini_set("highlight.html", "#808080");
        ini_set("highlight.keyword", "#0000BB; font-weight: bold");
        ini_set("highlight.string", "#DD0000");
    }
    else if ($fileExt == "html")
    {
        ini_set("highlight.comment", "green");
        ini_set("highlight.default", "#CC0000");
        ini_set("highlight.html", "#000000");
        ini_set("highlight.keyword", "black; font-weight: bold");
        ini_set("highlight.string", "#0000FF");
    }
    // ...

    $text = trim($text);
    $text = highlight_string("<?php " . $text, true);  // highlight_string() requires opening PHP tag or otherwise it will not colorize the text
    $text = trim($text);
    $text = preg_replace("|^\\<code\\>\\<span style\\=\"color\\: #[a-fA-F0-9]{0,6}\"\\>|", "", $text, 1);  // remove prefix
    $text = preg_replace("|\\</code\\>\$|", "", $text, 1);  // remove suffix 1
    $text = trim($text);  // remove line breaks
    $text = preg_replace("|\\</span\\>\$|", "", $text, 1);  // remove suffix 2
    $text = trim($text);  // remove line breaks
    $text = preg_replace("|^(\\<span style\\=\"color\\: #[a-fA-F0-9]{0,6}\"\\>)(&lt;\\?php&nbsp;)(.*?)(\\</span\\>)|", "\$1\$3\$4", $text);  // remove custom added "<?php "

    return $text;
}
?>

down

will at lolcat dot ca ¶

1 year ago

Here is the best way to highlight code if you want classes instead of inline styles:

<?php
function highlightcode($text){
    
    ini_set("highlight.comment", "c-comment");
    ini_set("highlight.default", "c-default");
    ini_set("highlight.html", "c-default");
    ini_set("highlight.keyword", "c-keyword");
    ini_set("highlight.string", "c-string");
    
    $text =
        trim(
            str_replace(
                '<br />',
                "\n", // replace <br> with newlines
                str_replace(
                    [
                        // leading <?php garbage
                        "<span style=\"color: c-default\">\n&lt;?php&nbsp;",
                        "<code>",
                        "</code>"
                    ],
                    "",
                    highlight_string("<?php " . $text, true)
                )
            )
        );
    
    // replace colors
    $classes = ["c-comment", "c-default", "c-keyword", "c-string"];
    
    foreach($classes as $class){
        
        $text = str_replace('<span style="color: ' . $class . '">', '<span class="' . $class . '">', $text);
    }
    
    return $text;
}
?>

Generates output that looks like this:

<span class="c-keyword">if(</span>condition<span class="c-keyword">){
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span class="c-string">"HTML&nbsp;here"</span><span class="c-keyword">;
}</span>

Hope this helps.

down

pyetrosafe at gmail dot com ¶

5 years ago

I read the note from "stanislav dot eckert at vizson dot de" and I really enjoyed the function he created.
For my use I made some adaptations leaving the function more practical and allowing the passage and multiple parameters at a time, I also modified the style of the <code> element with a black background and margins.

<?php

// Combined of the highlight_string and var_export
function hl_export()
{
    try {
        ini_set("highlight.comment", "#008000");
        ini_set("highlight.default", "#FFFFFF");
        ini_set("highlight.html", "#808080");
        ini_set("highlight.keyword", "#0099FF; font-weight: bold");
        ini_set("highlight.string", "#99FF99");

        $vars = func_get_args();

        foreach ( $vars as $var ) {
            $output = var_export($var, true);
            $output = trim($output);
            $output = highlight_string("<?php " . $output, true);  // highlight_string() requires opening PHP tag or otherwise it will not colorize the text
            $output = preg_replace("|\\<code\\>|", "<code style='background-color: #000000; padding: 10px; margin: 10px; display: block; font: 12px Consolas;'>", $output, 1);  // edit prefix
            $output = preg_replace("|(\\<span style\\=\"color\\: #[a-fA-F0-9]{0,6}\"\\>)(&lt;\\?php&nbsp;)(.*?)(\\</span\\>)|", "\$1\$3\$4", $output);  // remove custom added "<?php "
            echo $output;
        }
    } catch (Exception $e) {
        echo $e->getMessage();
    }
}

// Debug multiple vars at once.
$var1 = 'Example String';
$var2 = 1987;
$var3 = null;
$var4 = true;
$var5 = array('Array', '05', 05, false, null);

hl_export( $var1, $var2, $var3, $var4, $var5 );
?>

down

www.phella.net ¶

17 years ago

When you quote highlighted PHP code in your website you need to escape quotes. If you quote a lot it may be annoyning. Here is tiny snippet how to make quoting tidy and clean. Write your code like this:

<?code()?>
  $string = 'Here I put my code';
<?code()?>

And somewhere else define the function:

<?
  function code()
  {
    static $on=false;
    if (!$on) ob_start();
    else
    {
      $buffer= "<?\n".ob_get_contents()."?>";
      ob_end_clean();
      highlight_string($buffer);
    }
    $on=!$on;
  }
?>

down

vouksh at vouksh dot info ¶

19 years ago

Fully working, XHTML 1.1 ready xhtml_highlight function. I included the stripslashes, because of some problems I had with out it. It should be safe to leave it in there, but if you experience problems, feel free to take it out.

<?
function xhtml_highlight($str) {
    $hlt = highlight_string(stripslashes($str), true);
    $fon = str_replace(array('<font ', '</font>'), array('<span ', '</span>'), $hlt);
    $ret = preg_replace('#color="(.*?)"#', 'style="color: \\1"', $fon);
    echo $ret;
    return true;
}
?>

down

admin [at] develogix [dot] com ¶

19 years ago

I've been working on a good replacement for the highlight_string() function; and here is what I've come up with so far:

<?
function get_sourcecode_string($str, $return = false, $counting = true, $first_line_num = '1', $font_color = '#666'){
    $str = highlight_string($str, TRUE);
    $replace = array(
        '<font' => '<span',
        'color="' => 'style="color: ',
        '</font>' => '</span>',
        '<code>' => '',
        '</code>' => '',
        '<span style="color: #FF8000">' =>
            '<span style="color: '.$font_color.'">'
        );
    foreach ($replace as $html => $xhtml){
        $str = str_replace($html, $xhtml, $str);
    }
    // delete the first <span style="color:#000000;"> and the corresponding </span>
    $str = substr($str, 30, -9);
                
    $arr_html      = explode('<br />', $str);
    $total_lines   = count($arr_html);    
    $out           = '';
    $line_counter  = 0;
    $last_line_num = $first_line_num + $total_lines;
    
    foreach ($arr_html as $line){
        $line = str_replace(chr(13), '', $line);
        $current_line = $first_line_num + $line_counter;
        if ($counting){
            $out .= '<span style="color:'.$font_color.'">'
                  . str_repeat('&nbsp;', strlen($last_line_num) - strlen($current_line))
                  . $current_line
                  . ': </span>';
        }
        $out .= $line
              . '<br />'."\n";
        $line_counter++;
    }
    $out = '<code>'."\n".$out.'</code>."\n"';

    if ($return){return $out;}
    else {echo $out;}
}
?>

This function outputs valid XHTML 1.1 code by replacing font tags with span tags. You can also specify whether you want it to return or echo, output a line-count, the color of the line-count, and the starting line-count number.

Usage:
<?
// $str = string with php
// $return = true (return) / false (echo)
//    default of false
// $counting = true (count) / false (don't count)
//    default of true
// $start = starting count number
//    default of '1'
// $color = count color with preceding #
//    defalut of '#666'
get_sourcecode_string($str, $return,   $counting, $start, $color);
?>

down

Dmitry S ¶

16 years ago

Alternative XML syntax highlighting.

<?php
function xml_highlight($s)
{        
    $s = htmlspecialchars($s);
    $s = preg_replace("#&lt;([/]*?)(.*)([\s]*?)&gt;#sU",
        "<font color=\"#0000FF\">&lt;\\1\\2\\3&gt;</font>",$s);
    $s = preg_replace("#&lt;([\?])(.*)([\?])&gt;#sU",
        "<font color=\"#800000\">&lt;\\1\\2\\3&gt;</font>",$s);
    $s = preg_replace("#&lt;([^\s\?/=])(.*)([\[\s/]|&gt;)#iU",
        "&lt;<font color=\"#808000\">\\1\\2</font>\\3",$s);
    $s = preg_replace("#&lt;([/])([^\s]*?)([\s\]]*?)&gt;#iU",
        "&lt;\\1<font color=\"#808000\">\\2</font>\\3&gt;",$s);
    $s = preg_replace("#([^\s]*?)\=(&quot;|')(.*)(&quot;|')#isU",
        "<font color=\"#800080\">\\1</font>=<font color=\"#FF00FF\">\\2\\3\\4</font>",$s);
    $s = preg_replace("#&lt;(.*)(\[)(.*)(\])&gt;#isU",
        "&lt;\\1<font color=\"#800080\">\\2\\3\\4</font>&gt;",$s);
    return nl2br($s);
}
?>

down

manithu at fahr-zur-hoelle dot org ¶

20 years ago

This function will return highlighted, xhtml 1.1 valid code (replaces <font> with <span> elements and color with style attributes):

<?php

function xhtml_highlight($str) {
    $str = highlight_string($str, true);
    //replace <code><font color=""></font></code>
    $str = preg_replace('#<font color="([^\']*)">([^\']*)</font>#', '<span style="color: \\1">\\2</span>', $str);
    //replace other <font> elements
    return preg_replace('#<font color="([^\']*)">([^\']*)</font>#U', '<span style="color: \\1">\\2</span>', $str);
}

?>

down

gaggge at gmail dot com ¶

19 years ago

This is a little function for highlighting bbcode-stylish PHP code from a mysql database.
(Like this: [php]<?php echo "test"; ?>[/php])

<?php
function bbcode($s)
{
    $s = str_replace("]\n", "]", $s);
    $match = array('#\[php\](.*?)\[\/php\]#se');
    $replace = array("'<div>'.highlight_string(stripslashes('$1'), true).'</div>'");
    return preg_replace($match, $replace, $s);
}
?>

down

Pyerre ¶

17 years ago

This fonction replaces every space with the html code &nbsp; (non-breaking space)
this is not very good because text will not go to the line and causes a big width
for example in a bordered div, text will go across the border

my solution : 
echo str_replace("&nbsp;", " ",highlight_string("Arise, you children of the fatherland",true));
echo str_replace("&nbsp;", " ",highlight_file("test.php",true));

down

stalker at ruun dot de ¶

18 years ago

to vouksh: I expanded your functions a bit:

<?php
function xhtmlHighlightString($str,$return=false) {
   $hlt = highlight_string(stripslashes($str), true);
   $fon = str_replace(array('<font ', '</font>'), array('<span ', '</span>'), $hlt);
   $ret = preg_replace('#color="(.*?)"#', 'style="color: \\1"', $fon);
   if($return)
     return $ret;
   echo $ret;
   return true;
}
function xhtmlHighlightFile($path,$return=false) {
   $hlt = highlight_file($path, true);
   $fon = str_replace(array('<font ', '</font>'), array('<span ', '</span>'), $hlt);
   $ret = preg_replace('#color="(.*?)"#', 'style="color: \\1"', $fon);
   if($return)
     return $ret;
   echo $ret;
   return true;
}
?>

down

Dobromir Velev ¶

16 years ago

Here is an improved version of Dimitry's xml_highlight function.
I fixed a bug which replaced the first character of the tags name,
and added a line to replace the tabs and spaces with
non-breaking space symbols to keep the identation.

<?
function xml_highlight($s){
  $s = preg_replace("|<([^/?])(.*)\s(.*)>|isU", "[1]<[2]\\1\\2[/2] [5]\\3[/5]>[/1]", $s);
  $s = preg_replace("|</(.*)>|isU", "[1]</[2]\\1[/2]>[/1]", $s);
  $s = preg_replace("|<\?(.*)\?>|isU","[3]<?\\1?>[/3]", $s);
  $s = preg_replace("|\=\"(.*)\"|isU", "[6]=[/6][4]\"\\1\"[/4]",$s);
  $s = htmlspecialchars($s);
  $s = str_replace("\t","&nbsp;&nbsp;",$s);
  $s = str_replace(" ","&nbsp;",$s);
  $replace = array(1=>'0000FF', 2=>'0000FF', 3=>'800000', 4=>'FF00FF', 5=>'FF0000', 6=>'0000FF');
  foreach($replace as $k=>$v) {
    $s = preg_replace("|\[".$k."\](.*)\[/".$k."\]|isU", "<font color=\"#".$v."\">\\1</font>", $s);
  }

  return nl2br($s);
}
?>

down

stanislav dot eckert at vizson dot de ¶

9 years ago

The documentation says for the first parameter "The PHP code to be highlighted. This should include the opening tag. ". But it seems that the code should not only but *must* start with PHP's opening tag or otherwise the function will still modify but will not highlight the code.

down

Mean^_^ ¶

15 years ago

[EDIT BY danbrown AT php DOT net: The following note contains a user-supplied version of a syntax highlighter.]



<style type="text/css">

.linenum{

    text-align:right;

    background:#FDECE1;

    border:1px solid #cc6666;

    padding:0px 1px 0px 1px;

    font-family:Courier New, Courier;

    float:left;

    width:17px;

    margin:3px 0px 30px 0px;

    }



code    {/* safari/konq hack */

    font-family:Courier New, Courier;

}



.linetext{

    width:700px;

    text-align:left;

    background:white;

    border:1px solid #cc6666;

    border-left:0px;

    padding:0px 1px 0px 8px;

    font-family:Courier New, Courier;

    float:left;

    margin:3px 0px 30px 0px;

    }



br.clear    {

    clear:both;

}



</style>

<?php



 function printCode($code, $lines_number = 0)    {

               

         if (!is_array($code)) $codeE = explode("\n", $code);

        $count_lines = count($codeE);

        

        $r1 = "Code:<br />";



         if ($lines_number){            

                $r1 .= "<div class=\"linenum\">";

                foreach($codeE as $line =>$c) {     

                    if($count_lines=='1')

                        $r1 .= "1<br>";

                    else

                        $r1 .= ($line == ($count_lines - 1)) ? "" :  ($line+1)."<br />"; 

                 } 

                 $r1 .= "</div>";

         }



         $r2 = "<div class=\"linetext\">";

         $r2 .= highlight_string($code,1);

         $r2 .= "</div>";



        $r .= $r1.$r2;



        echo "<div class=\"code\">".$r."</div>\n";

    }



    printCode('<?php echo "PHP Code" ?>    ',1);

?>



by mean

Share idea.

good luck ^_^

down

fsx dot nr01 at gmail dot com ¶

16 years ago

Here is an improved version of the code highlighter w/ linenumbers from 'vanessaschissato at gmail dot com' - http://nl.php.net/manual/en/function.highlight-string.php#70456

<?php

    function printCode($source_code)
    {

        if (is_array($source_code))
            return false;
       
        $source_code = explode("\n", str_replace(array("\r\n", "\r"), "\n", $source_code));
        $line_count = 1;

        foreach ($source_code as $code_line)
        {
            $formatted_code .= '<tr><td>'.$line_count.'</td>';
            $line_count++;
           
            if (ereg('<\?(php)?[^[:graph:]]', $code_line))
                $formatted_code .= '<td>'. str_replace(array('<code>', '</code>'), '', highlight_string($code_line, true)).'</td></tr>';
            else
                $formatted_code .= '<td>'.ereg_replace('(&lt;\?php&nbsp;)+', '', str_replace(array('<code>', '</code>'), '', highlight_string('<?php '.$code_line, true))).'</td></tr>';
        }

        return '<table style="font: 1em Consolas, \'andale mono\', \'monotype.com\', \'lucida console\', monospace;">'.$formatted_code.'</table>';
    }

?>

down

Daniel ¶

16 years ago

Well, Just a little something I wrote which highlights an HTML code...It'll be going through many changes in the next few days.... until then =) enjoy

<?php
/*************************************\
 CODE PANE 1.0 - SILVERWINGS - D. Suissa
\*************************************/

class HTMLcolorizer{
    private $pointer = 0; //Cursor position.
    private $content = null; //content of document.
    private $colorized = null;
    function __construct($content){
        $this->content = $content;
    }
    function colorComment($position){
        $buffer = "&lt;<span class='HTMLComment'>";
        for($position+=1;$position < strlen($this->content) && $this->content[$position] != ">" ;$position++){
            $buffer.= $this->content[$position];
        }
        $buffer .= "</span>&gt;";
        $this->colorized .= $buffer;
        return $position;
    }
    function colorTag($position){
        $buffer = "&lt;<span class='tagName'>";
        $coloredTagName = false;
        //As long as we're in the tag scope
        for($position+=1;$position < strlen($this->content) && $this->content[$position] != ">" ;$position++){
            if($this->content[$position] == " " && !$coloredTagName){
                $coloredTagName = true;
                $buffer.="</span>";
            }else if($this->content[$position] != " " && $coloredTagName){
                //Expect attribute
                $attribute = "";
                //While we're in the tag
                for(;$position < strlen($this->content) && $this->content[$position] != ">" ;$position++){
                    if($this->content[$position] != "="){
                        $attribute .= $this->content[$position];
                    }else{
                        $value="";
                        $buffer .= "<span class='tagAttribute'>".$attribute."</span>=";
                        $attribute = ""; //initialize it
                        $inQuote = false;
                        $QuoteType = null;
                        for($position+=1;$position < strlen($this->content) && $this->content[$position] != ">" && $this->content[$position] != " "  ;$position++){
                            if($this->content[$position] == '"' || $this->content[$position] == "'"){
                                $inQuote = true;
                                $QuoteType = $this->content[$position];
                                $value.=$QuoteType;
                                //Read Until next quotation mark.
                                for($position+=1;$position < strlen($this->content) && $this->content[$position] != ">" && $this->content[$position] != $QuoteType  ;$position++){
                                    $value .= $this->content[$position];
                                }    
                                $value.=$QuoteType;
                            }else{//No Quotation marks.
                                $value .= $this->content[$position];
                            }                            
                        }
                        $buffer .= "<span class='tagValue'>".$value."</span>";
                        break;            
                    }
                    
                }
                if($attribute != ""){$buffer.="<span class='tagAttribute'>".$attribute."</span>";}
            }
            if($this->content[$position] == ">" ){break;}else{$buffer.= $this->content[$position];}
            
        }
        //In case there were no attributes.
        if($this->content[$position] == ">" && !$coloredTagName){
            $buffer.="</span>&gt;";
            $position++;
        }
        $this->colorized .= $buffer;
        return --$position;
    }
    function colorize(){
        $this->colorized="";
        $inTag = false;
        for($pointer = 0;$pointer<strlen($this->content);$pointer++){
            $thisChar = $this->content[$pointer];
            $nextChar = $this->content[$pointer+1];
            if($thisChar == "<"){
                if($nextChar == "!"){
                    $pointer = $this->colorComment($pointer);
                }else if($nextChar == "?"){
                    //colorPHP();
                }else{
                    $pointer = $this->colorTag($pointer);
                }
            }else{
                $this->colorized .= $this->content[$pointer];
            }
        }
        return $this->colorized;
    }
}
$curDocName = $_REQUEST['doc'];
$docHandle = fopen($curDocName,"r");
$docStrContent = fread($docHandle,filesize($curDocName));
fclose($docHandle);
$HTMLinspector = new HTMLcolorizer($docStrContent);
$document = $HTMLinspector->colorize();
?>

<html>
    <head>
        <style type="text/css">
        /**********************\
         * MOZILLA FIREFOX STYLE
        \**********************/
        /*pre{font-family:Tahoma;font-size:px;}*/
        .tagName{color:purple;}
        .tagAttribute{color:red;}
        .tagValue{color:blue;}
        .HTMLComment{font-style:italic;color:green;}
        </style>
    </head>
    <body>
    <?php
        echo "<pre>".$document."</pre>";
    ?>
    </body>
</html>

down

wm at tellinya dot com ¶

16 years ago

I wanted to build a better function and exclude operators {}=- from keywords span class. I also wanted to link functions used in my PHP code directly to the PHP site.
A lot more changes and tweaks have been made and the output is much better!

Find the function here :
http://www.tellinya.com/art2/262/highligh-php-syntax/
and ditch the old PHP one permanently.
Tested and built on PHP 5.2.0.

Looking forward to any input.

down

zer0 ¶

19 years ago

Concerning my code below:

I'm sorry, I completely forgot about str_ireplace being for PHP 5 for some reason. Also, there was another error I missed (too many late nights ;)). Here's the corrected code:

<?php
    function highlight_code($code, $inline=false, $return=false) // Pre php 4 support for capturing highlight
    {
        (string) $highlight = "";
        if ( version_compare(PHP_VERSION, "4.2.0", "<") === 1 )
        {
            ob_start(); // start output buffering to capture contents of highlight
            highlight_string($code);
            $highlight = ob_get_contents(); // capture output
            ob_end_clean(); // clear buffer cleanly
        }
        else
        {
            $highlight=highlight_string($code, true);
        }
        
        # Using preg_replace will allow PHP 4 in on the fun
        if ( $inline === true )
            $highlight=preg_replace("/<code>/i","<code class=\"inline\">",$highlight);
        else
            $highlight=preg_replace("/<code>/i","<code class=\"block\">",$highlight);            
        
        if ( $return === true )
        {
            return $highlight;
        }
        else
        {
            echo $highlight;
        }
    }
?>

down

Sam Wilson ¶

19 years ago

manithu at fahr-zur-hoelle dot org forgot only one thing:  to fix the break tags.  The addidtion of the following should do it.

<?php
$str = str_replace("<br>", "<br />", $str);
?>

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bpgordon at gmail dot com ¶

19 years ago

On dleavitt AT ucsc DOT edu's comment:

You might want to use md5($html_string) instead of "piggusmaloy" as a generally good programming practice. Just in case "piggusmaloy" is actually in $html_string.

down

trixsey at animania dot nu ¶

19 years ago

A neat function I made. Syntax coloring, row numbers, varying background colors per row in the table.

<?
function showCode($code) {
    $html = highlight_string($code, true);
    $html = str_replace("\n", "", $html);
    $rows = explode("<br />", $html);

    $row_num = array();
    $i = 1;

    foreach($rows as $row) {
        if($i < 10) {
            $i = "0".$i;
        }

        if($i==1) {
            $row_num[] = "<tr><td><code><font color=\"#000000\"><code>$i</code></font>\t$row</code></td></tr>";
        }

        if($i!=1) {
            if(is_int($i/2)) {
                $row_num[] = "<tr bgcolor=\"#F9F9F9\"><td><code><font color=\"#000000\">$i</font>\t$row</code></td></tr>";
            } else {
                $row_num[] = "<tr><td><code><font color=\"#000000\">$i</font>\t$row</code></td></tr>";
            }
        }

        $i++;
    }
    return "<pre>\nFilename: <b>$_GET[file]</b>\n<table
    style=\"border:1px #000000 solid\">".implode($row_num)."</table></pre>";
}
?>

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support at superhp dot de ¶

19 years ago

With this function you can highlight php code with line numbers:

<?php
function highlight_php($string)
{
  $Line = explode("\n",$string);

  for($i=1;$i<=count($Line);$i++)
  {
    $line .= "&nbsp;".$i."&nbsp;<br>";
  }
    
  ob_start();
  highlight_string($string);
  $Code=ob_get_contents();
  ob_end_clean();
  
  $header='<table border="0" cellpadding="0" cellspacing="0" width="95%" style="border-style: solid; border-width:1px; border-color: white black black white">
    <tr>
      <td width="100%" colspan="2"  style="border-style: solid; border-width:1px; border-color: white; background-color: #99ccff; font-family:Arial; color:white; font-weight:bold;">Php-Code:</td>
    </tr>
    <tr>
      <td width="3%" valign="top" style="background-color: #99ccff; border-style: solid; border-width:1px; border-color: white;"><code>'.$line.'</code></td>
      <td width="97%" valign="top" style="background-color: white;"><div style="white-space: nowrap; overflow: auto;"><code>';

  $footer=$Code.'</div></code></td>
    </tr>
  </table>';

  return $header.$footer;
} ?>

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admin at bwongar dot com ¶

19 years ago

I didn't get the expected results from the other XHTML_highlight function, so I developed my own and it is much more efficient. The older one uses a preg_replace to replace the contents of the tag to within a span tag. The only preg_replace in my function pulls the color attribute, and puts it within a str_replace'd span tag.

<?php
function xhtml_highlight($str) {
    $str = highlight_string($str, true);
    $str = str_replace(array('<font ', '</font>'), array('<span ', '</span>'), $str);
    return preg_replace('#color="(.*?)"#', 'style="color: \\1"', $str);
}

?>

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-1

peter at int8 dot com ¶

18 years ago

This hasn't been mentioned, but it appears that PHP opening and closing tags are required to be part of the code snippet.
<?php highlight_string("<? \$var = 15; ?>"); ?>
works, while
<?php highlight_string("\$var = 15;"); ?>
does not. This is unforunate for those of use who want to show tiny code snippets, but there you go. Earlier versions of this function did not have this requirement, if I remember correctly.

down

-1

supremacy2k at gmail dot com ¶

17 years ago

A simplification of functions vanessaschissato at gmail dot com at 17-Oct-2006 05:04.

Since it had trouble keeping the code intact. (It removed /* )

function showCode($code) {
 $code = highlight_string($code, true);
 $code = explode("<br />", $code);
 
 $i = "1";
 foreach ($code as $line => $syntax) {
  echo "<font color='black'>".$i."</font> ".$syntax."<br>";
  $i++;
 }
}

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-1

tyler dot reed at brokeguysinc dot com ¶

18 years ago

This is a little chunk of code that i use to show the source of a file, i took part of the idea from a example i found on another php function page.

This code takes a php file and highlights it and places a line number next to it.  Great for on the fly debugging.

<?php
// Get a file into an array
$lines = file('index.php');

// Loop through our array, show HTML source as HTML source; and line numbers too.
echo('<table border=0 cellpadding=0 cellspacing=0>');
foreach ($lines as $line_num => $line) {
    echo('<tr>');
    echo('<td bgcolor = "#cccccc">');
    echo('<code>' . ($line_num + 1) . '</code>');
    echo('</td>');
    echo('<td>');          
    highlight_string($line);
    echo('</td>');
    echo('</tr>');
}

?>

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-2

zero ¶

19 years ago

In some cases, I found that it's useful to have highlight_string format <code>...</code> inline as part of a paragraph, and other times, as a block for demonstrating multiple lines of code. I made this function to help out.

<?php
    function highlight_code($code, $inline=false, $return=false) // Pre php 4 support for capturing highlight
    {
        (string) $highlight = "";
        if ( version_compare(phpversion(), "4.2.0", "<") === 1 )
        {
            ob_start(); // start output buffering to capture contents of highlight
            highlight_string($code);
            $highlight = ob_get_contents(); // capture output
            ob_end_clean(); // clear buffer cleanly
        }
        else
        {
            $highlight=highlight_string($data, true);
        }
        
        ## The classes below need to correspond to a stylesheet!
        if ( $inline === true )
          $highlight=str_ireplace("<code>","<code class=\"inline\">",$highlight);
        else
          $highlight=str_ireplace("<code>","<code class=\"block\">",$highlight);
            
        
        if ( $return === true )
        {
            return $highlight;
        }
        else
        {
            echo $highlight;
        }
    }
?>

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-3

joshuaeasy4u at gmail dot com ¶

11 years ago

<?php
function printCode($source_code)
{
if ( is_array($source_code))
return false;
$source_code=explode("\n",str_replace(array("\r\n","\r"),"\n",$source_code));
$line_count=1;
foreach ( $source_code as $code_line)
{
$formatted_code .='<tr><td>'.$line_count.'</td>';
$line_count++;
if ( ereg('<\?(php)?[^[:graph:]]',$code_line))
$formatted_code.='<td>'.str_replace(array('<code>','</code>'),'',highlight_string($code_line,true)).'</td></tr>';
else
$formatted_code .='<td>'.ereg_replace('(&lt;\?php&nbsp;)+','',str_replace(array('<code>','</code>'),'',highlight_string('<?php '.$code_line,true))).'</td></tr>';
}
return '<table style="font: 1em Consolas, \'andale mono\', \' monotype.com\', \'lucida console\', monospace;">'.$formatted_code.'</table>';
}
?>

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-5

Dmitry S ¶

16 years ago

The simple XML syntax highlighting.

<?php
function xml_highlight($s)
{
     $s = preg_replace("|<[^/?](.*)\s(.*)>|isU","[1]<[2]\\1[/2] [5]\\2[/5]>[/1]",$s);
     $s = preg_replace("|</(.*)>|isU","[1]</[2]\\1[/2]>[/1]",$s);
     $s = preg_replace("|<\?(.*)\?>|isU","[3]<?\\1?>[/3]",$s);
     $s = preg_replace("|\=\"(.*)\"|isU","[6]=[/6][4]\"\\1\"[/4]",$s);
     $s = htmlspecialchars($s);
     $replace = array(1=>'0000FF', 2=>'808000', 3=>'800000', 4=>'FF00FF', 5=>'FF0000', 6=>'0000FF');
     foreach($replace as $k=>$v)
     {
          $s = preg_replace("|\[".$k."\](.*)\[/".$k."\]|isU","<font color=\"".$v."\">\\1</font>",$s);
     }
    return nl2br($s);
}
?>

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