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mb_ereg_replace_callback — Perform a regular expresssion seach and replace with multibyte support using a callback
$pattern , callable $callback , string $string [, string $option = "msr" ] ) Scans string for matches to pattern, then replaces the matched text with the output of callback function.
The behavior of this function is almost identical to mb_ereg_replace(), except for the fact that instead of replacement parameter, one should specify a callback.
This function is available in PHP 5.4.1 or later.
patternThe regular expression pattern.
Multibyte characters may be used in pattern.
callback A callback that will be called and passed an array of matched elements in the subject string. The callback should return the replacement string.
You'll often need the callback function for a mb_ereg_replace_callback() in just one place. In this case you can use an anonymous function (since PHP 5.3.0) or create_function() to declare an anonymous function as callback within the call to mb_ereg_replace_callback(). By doing it this way you have all information for the call in one place and do not clutter the function namespace with a callback function's name not used anywhere else.
stringThe string being checked.
option Matching condition can be set by option parameter. If i is specified for this parameter, the case will be ignored. If x is specified, white space will be ignored. If m is specified, match will be executed in multiline mode and line break will be included in '.'. If p is specified, match will be executed in POSIX mode, line break will be considered as normal character. Note that e cannot be used for mb_ereg_replace_callback().
The resultant string on success, or FALSE on error.
Note:
The internal encoding or the character encoding specified by mb_regex_encoding() will be used as the character encoding for this function.
Example #1 mb_ereg_replace_callback() example
<?php
// this text was used in 2002
// we want to get this up to date for 2003
$text = "April fools day is 04/01/2002\n";
$text.= "Last christmas was 12/24/2001\n";
// the callback function
function next_year($matches)
{
// as usual: $matches[0] is the complete match
// $matches[1] the match for the first subpattern
// enclosed in '(...)' and so on
return $matches[1].($matches[2]+1);
}
echo mb_ereg_replace_callback(
"(\d{2}/\d{2}/)(\d{4})",
"next_year",
$text);
?> The above example will output:
April fools day is 04/01/2003 Last christmas was 12/24/2002
Example #2 mb_ereg_replace_callback() using anonymous function supported in PHP 5.3.0 or later
<?php
// this text was used in 2002
// we want to get this up to date for 2003
$text = "April fools day is 04/01/2002\n";
$text.= "Last christmas was 12/24/2001\n";
echo mb_ereg_replace_callback(
"(\d{2}/\d{2}/)(\d{4})",
function ($matches) {
return $matches[1].($matches[2]+1);
},
$text);
?>