mb_ereg_replace_callback
(PHP 5 >= 5.4.1, PHP 7)
mb_ereg_replace_callback — Perform a regular expression search and replace with multibyte support using a callback
Description
$pattern
, callable $callback
, string $string
[, string $option = "msr"
] ) : string
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.
Parameters
-
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
subjectstring. The callback should return the replacement string.You'll often need the
callbackfunction 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.
-
option -
The search option. See mb_regex_set_options() for explanation.
Notes
Note:
The internal encoding or the character encoding specified by mb_regex_encoding() will be used as the character encoding for this function.
Examples
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);
?>
See Also
- mb_regex_encoding() - Set/Get character encoding for multibyte regex
- mb_ereg_replace() - Replace regular expression with multibyte support
- Anonymous functions
- information about the callback type
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Document created the 30/01/2003, last modified the 26/10/2018
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References
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