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    str_ireplace

    (PHP 5, PHP 7, PHP 8)

    str_ireplace — Case-insensitive version of str_replace()

    Description

    str_ireplace(
        array|string $search,
        array|string $replace,
        string|array $subject,
        int &$count = null
    ): string|array

    This function returns a string or an array with all occurrences of search in subject (ignoring case) replaced with the given replace value.

    To replace text based on a pattern rather than a fixed string, use preg_replace() with the i pattern modifier.

    Parameters

    If search and replace are arrays, then str_ireplace() takes a value from each array and uses them to search and replace on subject. If replace has fewer values than search, then an empty string is used for the rest of replacement values. If search is an array and replace is a string, then this replacement string is used for every value of search. The converse would not make sense, though.

    If search or replace are arrays, their elements are processed first to last.

    search

    The value being searched for, otherwise known as the needle. An array may be used to designate multiple needles.

    replace

    The replacement value that replaces found search values. An array may be used to designate multiple replacements.

    subject

    The string or array being searched and replaced on, otherwise known as the haystack.

    If subject is an array, then the search and replace is performed with every entry of subject, and the return value is an array as well.

    count

    If passed, this will be set to the number of replacements performed.

    Return Values

    Returns a string or an array of replacements.

    Changelog

    Version Description
    8.2.0 Case folding no longer depends on the locale set with setlocale(). Only ASCII case folding will be done. Non-ASCII bytes will be compared by their byte value.

    Examples

    Example #1 str_ireplace() example

    <?php
    $bodytag     = str_ireplace("%body%", "black", "<body text=%BODY%>");
    echo     $bodytag; // <body text=black>
    ?>

    Notes

    Note: This function is binary-safe.

    Caution

    Replacement order gotcha

    Because str_ireplace() replaces left to right, it might replace a previously inserted value when doing multiple replacements. Example #2 in the str_replace() documentation demonstrates how this may affect you in practice.

    See Also

    • str_replace() - Replace all occurrences of the search string with the replacement string
    • preg_replace() - Perform a regular expression search and replace
    • strtr() - Translate characters or replace substrings

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    User Contributed Notes 11 notes

    up
    5
    Tom
    7 months ago
    Attention! str_ireplace does not destroy multibyte characters. But multibyte characters are not replaced case-insensitively.

    <?php
    echo str_ireplace('Ä', 'Ae_', 'Ägypten'); // Ae_gypten
    echo str_ireplace('ä', 'ae_', 'ägypten'); // ae_gypten
    echo str_ireplace('ä', 'ae_', 'Ägypten'); // Ägypten
    echo str_ireplace('Ä', 'ae_', 'ägypten'); // ägypten
    echo str_ireplace('E', 'e_', 'egypt'); // e_gypt
    echo str_ireplace('e', 'e_', 'Egypt'); // e_gypt
    echo str_ireplace('ä', 'ae_', mb_strtolower('Ägypten')); // ae_gypten
    up
    26
    sawdust
    15 years ago
    Here's a different approach to search result keyword highlighting that will match all keyword sub strings in a case insensitive manner and preserve case in the returned text. This solution first grabs all matches within $haystack in a case insensitive manner, and the secondly loops through each of those matched sub strings and applies a case sensitive replace in $haystack. This way each unique (in terms of case) instance of $needle is operated on individually allowing a case sensitive replace to be done in order to preserve the original case of each unique instance of $needle.

    <?php
    function highlightStr($haystack, $needle, $highlightColorValue) {
    // return $haystack if there is no highlight color or strings given, nothing to do.
    if (strlen($highlightColorValue) < 1 || strlen($haystack) < 1 || strlen($needle) < 1) {
    return     $haystack;
    }
    preg_match_all("/$needle+/i", $haystack, $matches);
    if (    is_array($matches[0]) && count($matches[0]) >= 1) {
    foreach (    $matches[0] as $match) {
    $haystack = str_replace($match, '<span style="background-color:'.$highlightColorValue.';">'.$match.'</span>', $haystack);
    }
    }
    return     $haystack;
    }
    ?>
    up
    17
    daevid at daevid dot com
    19 years ago
    here's a neat little function I whipped up to do HTML color coding of SQL strings.

    <?php
    /**
    * Output the HTML debugging string in color coded glory for a sql query
    * This is very nice for being able to see many SQL queries
    * @access public
    * @return void. prints HTML color coded string of the input $query.
    * @param string $query The SQL query to be executed.
    * @author Daevid Vincent [daevid@LockdownNetworks.com]
    * @version 1.0
    * @date 04/05/05
    * @todo highlight SQL functions.
    */
    function SQL_DEBUG( $query )
    {
    if(     $query == '' ) return 0;

    global     $SQL_INT;
    if( !isset(    $SQL_INT) ) $SQL_INT = 0;

    //[dv] this has to come first or you will have goofy results later.
    $query = preg_replace("/['\"]([^'\"]*)['\"]/i", "'<FONT COLOR='#FF6600'>$1</FONT>'", $query, -1);

    $query = str_ireplace(
    array (
    '*',
    'SELECT ',
    'UPDATE ',
    'DELETE ',
    'INSERT ',
    'INTO',
    'VALUES',
    'FROM',
    'LEFT',
    'JOIN',
    'WHERE',
    'LIMIT',
    'ORDER BY',
    'AND',
    'OR ', //[dv] note the space. otherwise you match to 'COLOR' ;-)
    'DESC',
    'ASC',
    'ON '
    ),
    array (
    "<FONT COLOR='#FF6600'><B>*</B></FONT>",
    "<FONT COLOR='#00AA00'><B>SELECT</B> </FONT>",
    "<FONT COLOR='#00AA00'><B>UPDATE</B> </FONT>",
    "<FONT COLOR='#00AA00'><B>DELETE</B> </FONT>",
    "<FONT COLOR='#00AA00'><B>INSERT</B> </FONT>",
    "<FONT COLOR='#00AA00'><B>INTO</B></FONT>",
    "<FONT COLOR='#00AA00'><B>VALUES</B></FONT>",
    "<FONT COLOR='#00AA00'><B>FROM</B></FONT>",
    "<FONT COLOR='#00CC00'><B>LEFT</B></FONT>",
    "<FONT COLOR='#00CC00'><B>JOIN</B></FONT>",
    "<FONT COLOR='#00AA00'><B>WHERE</B></FONT>",
    "<FONT COLOR='#AA0000'><B>LIMIT</B></FONT>",
    "<FONT COLOR='#00AA00'><B>ORDER BY</B></FONT>",
    "<FONT COLOR='#0000AA'><B>AND</B></FONT>",
    "<FONT COLOR='#0000AA'><B>OR</B> </FONT>",
    "<FONT COLOR='#0000AA'><B>DESC</B></FONT>",
    "<FONT COLOR='#0000AA'><B>ASC</B></FONT>",
    "<FONT COLOR='#00DD00'><B>ON</B> </FONT>"
    ),
    $query
    );

    echo     "<FONT COLOR='#0000FF'><B>SQL[".$SQL_INT."]:</B> ".$query."<FONT COLOR='#FF0000'>;</FONT></FONT><BR>\n";

    $SQL_INT++;

    }     //SQL_DEBUG
    ?>
    up
    6
    Anteaus
    9 years ago
    If you follow the instructions given here you will end up with code which works in php5.3 but which bugs-out in php5.4. Reason is that '&$count' (explicit pass by reference) is now an illegal construct.
    Nasty, especially it leads to unreliable code which may work on test but not in production. Manual needs corrected!
    up
    5
    stepanic dot matija at gmail dot com
    14 years ago
    FIX-ed problem with highlighting second 'o' OR 'a', in this string

    <?php
    function highlight_string ($haystack, $needle, $highlight_class) {
    // return $haystack if there is no highlight color or strings given, nothing to do.

    $first_encode='XXXXXXXXXXXXXXX'; //ENCODE string

    $second_encode='YYYYYYYYYYYYYYY';

    preg_match_all("/$needle+/i", $haystack, $matches);
    if (    is_array($matches[0]) && count($matches[0]) >= 1) {
    foreach (    $matches[0] as $match) {
    $haystack = str_replace($match, $first_encode.$match.$second_encode, $haystack);
    }
    }

    $haystack=str_replace(array($first_encode,$second_encode),
    array(    '<font class="'.$highlight_class.'" >','</font>'),$haystack);

    return     $haystack;
    }
    ?>
    up
    4
    aidan at php dot net
    20 years ago
    This functionality is now implemented in the PEAR package PHP_Compat.

    More information about using this function without upgrading your version of PHP can be found on the below link:

    http://pear.php.net/package/PHP_Compat
    up
    3
    ishutko at gmail dot com
    15 years ago
    For function work with cirilic

    setlocale (LC_ALL, 'ru_RU');
    up
    4
    Psudo - thepsudo at gmail dot com
    13 years ago
    For highlighting without the overhead of regex and without destroying capitalization, try this:

    <?php
    function highlight($needle, $haystack){
    $ind = stripos($haystack, $needle);
    $len = strlen($needle);
    if(    $ind !== false){
    return     substr($haystack, 0, $ind) . "<b>" . substr($haystack, $ind, $len) . "</b>" .
    highlight($needle, substr($haystack, $ind + $len));
    } else return     $haystack;
    }
    ?>

    This example uses HTML bold tags, but you can easily change the highlighting method.
    up
    -1
    Michael dot Bond at mail dot wvu dot edu
    16 years ago
    This function will highlight search terms (Key Words in Context).

    The difference between this one and the ones below is that it will preserve the original case of the search term as well. So, if you search for "american" but in the original string it is "American" it will retain the capital "A" as well as the correct case for the rest of the string.

    <?php
    function kwic($str1,$str2) {

    $kwicLen = strlen($str1);

    $kwicArray = array();
    $pos = 0;
    $count = 0;

    while(    $pos !== FALSE) {
    $pos = stripos($str2,$str1,$pos);
    if(    $pos !== FALSE) {
    $kwicArray[$count]['kwic'] = substr($str2,$pos,$kwicLen);
    $kwicArray[$count++]['pos'] = $pos;
    $pos++;
    }
    }

    for(    $I=count($kwicArray)-1;$I>=0;$I--) {
    $kwic = '<span class="kwic">'.$kwicArray[$I]['kwic'].'</span>';
    $str2 = substr_replace($str2,$kwic,$kwicArray[$I]['pos'],$kwicLen);
    }

    return(    $str2);
    }
    ?>
    up
    -2
    hfuecks at nospam dot org
    19 years ago
    Note that character case is being defined by your server's locale setting, which effects strings containing non-ASCII characters.

    See strtolower() - http://www.php.net/strtolower and comments - internally str_ireplace converts $search and $replace to lowercase to find matches.
    up
    -4
    holblin at holblin dot com
    13 years ago
    Warning with highlighting ...

    I used :

    <?php
    $text     = preg_replace('/('.$q.')/i','<span class=highlighting "">$1</span>' , $text);
    ?>

    Because this line do not allow to highlight uppercase and lowercase correctly (transform uppercase to lowercase for exemple)

    <?php
    $text     = str_ireplace( $q , '<span class=highlighting "">'.$q.'</span>', $text);
    ?>

    But when $q contain some regex you have some problems ... for exemple :
    <?php $q = '('; ?>

    So you must use preg_replace to highlight correctly the text and you must create a function for escape bad regex caracters !

    I think that a better function can be found but this works I guess :

    <?php
    function regex_escape( $q )
    {
    return     preg_replace('/([\[\]\(\)\{\}\-\.\*\?\|\^\$])/', '\$1', $q);
    }
    ?>
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