mb-ereg-replace-callback

mb_ereg_replace_callback

Perform a regular expression search and replace with multibyte support using a callback

ENTITY

string

false

null

mb_ereg_replace_callback

string

pattern

callable

callback

string

string

string

null

options

ENTITY

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.

ENTITY

pattern
The 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 string 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 to declare the 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.

string
The string being checked.

options
The search option. See mb_regex_set_options for explanation.

ENTITY

The resultant string on success, or ENTITY on error. If string is not valid for the current encoding, ENTITY is returned.

ENTITY

ENTITY

<?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);

?>

    

April fools day is 04/01/2003
Last christmas was 12/24/2002

<?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);
?>

    

ENTITY ENTITY

ENTITY

mb_regex_encoding, mb_ereg_replace, Anonymous functions