highlight_string

You can change the colors of the highlighting, like this: <?phpini_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:<?phpfunction 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 $text;}?>Note, that it will remove the <code> tag too, so you get the formatted text directly, which gives you more freedom to work with the result.I personally suggest to combine both things to have a nice highlighting function for different file types with different highlight coloring sets:<?phpfunction highlightText($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;}?>

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

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_exportfunction 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 );?>

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;  }?>

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;}?>

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);?>

Alternative XML syntax highlighting.<?phpfunction 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);}?>

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

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

This fonction replaces every space with the html code   (non-breaking space)this is not very good because text will not go to the line and causes a big widthfor example in a bordered div, text will go across the bordermy solution : echo str_replace(" ", " ",highlight_string("Arise, you children of the fatherland",true));echo str_replace(" ", " ",highlight_file("test.php",true));

to vouksh: I expanded your functions a bit:<?phpfunction 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;}?>

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 withnon-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);}?>

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.

[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 ^_^

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>';    }?>

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>

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.

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;        }    }?>

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);?>

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.

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>";}?>

With this function you can highlight php code with line numbers:<?phpfunction 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;} ?>

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.<?phpfunction 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);}?>

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.

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++; }}

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>');}?>

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;        }    }?>

<?phpfunction 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>';}?>

The simple XML syntax highlighting.<?phpfunction 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);}?>