Based on some tests, I found these important traits of the function. (These would
be nice to see documented as part of its spec, e.g. for confirmation. Without that,
this is just experimental curiosity. Still better than guesswork, though! ;) )
1. Changes cascade over a subject across callbacks, i.e. a change made to a
subject by a callback will be seen by the next callback, if its pattern matches
the changed subject.
(But a change made by a previous call of the *same* callback (on any subject)
will not be seen by that callback again.)
2. The pattern + callback pairs will be applied in the order of their appearance
in $patterns_and_callbacks.
3. The callback can't be null (or '') for a quick shortcut for empty replacements.
4. Overall, the algorithm starts iterating over $patterns_and_callbacks, and then
feeds each $subject to the current callback, repeatedly for every single match
of its pattern on the current subject (unlike "preg_match_all", that is, which
can do the same in one go, returning the accumulated results in an array).
This basically means that the "crown jewel", an even more efficient function:
"preg_replace_all_callback_array" is still missing from the collection.
(Of course, that would better fit a new design of the regex API, where one
API could flexibly handle various different modes via some $flags = [] array.)
5. (This last one is not specific to this function, but inherent to regexes, OTOH,
it's probably more relevant here than anywhere else in PHP's regex support.)
Even apparently simple cases can generate a crazy (and difficult-to-predict)
number of matches, and therefore callback invokations, so remember the set
$limit, where affordable. But, of course, try to sharpen your patterns first!
E.g. use ^...$ anchoring to avoid unintended extra calls on matching substrings
of a subject, (I.e. '/.*/', without anchoring, would match twice: once for the
whole subject, and then for a trailing empty substring -- but I'm not quite sure
this should actually be correct behavior, though.)
preg_replace_callback_array
(PHP 7, PHP 8)
preg_replace_callback_array — Perform a regular expression search and replace using callbacks
Description
preg_replace_callback_array(
array
string|array
int
int
int
): string|array|null
array
$pattern,string|array
$subject,int
$limit = -1,int
&$count = null,int
$flags = 0): string|array|null
The behavior of this function is similar to preg_replace_callback(), except that callbacks are executed on a per-pattern basis.
Parameters
-
pattern -
An associative array mapping patterns (keys) to callables (values).
-
subject -
The string or an array with strings to search and replace.
-
limit -
The maximum possible replacements for each pattern in each
subjectstring. Defaults to-1(no limit). -
count -
If specified, this variable will be filled with the number of replacements done.
-
flags -
flagscan be a combination of thePREG_OFFSET_CAPTUREandPREG_UNMATCHED_AS_NULLflags, which influence the format of the matches array. See the description in preg_match() for more details.
Return Values
preg_replace_callback_array() returns an array if the
subject parameter is an array, or a string
otherwise. On errors the return value is null
If matches are found, the new subject will be returned, otherwise
subject will be returned unchanged.
Errors/Exceptions
If the regex pattern passed does not compile to a valid regex, an E_WARNING is emitted.
Changelog
| Version | Description |
|---|---|
| 7.4.0 |
The flags parameter was added.
|
Examples
Example #1 preg_replace_callback_array() example
<?php
$subject = 'Aaaaaa Bbb';
preg_replace_callback_array(
[
'~[a]+~i' => function ($match) {
echo strlen($match[0]), ' matches for "a" found', PHP_EOL;
},
'~[b]+~i' => function ($match) {
echo strlen($match[0]), ' matches for "b" found', PHP_EOL;
}
],
$subject
);
?>The above example will output:
6 matches for "a" found 3 matches for "b" found
See Also
- PCRE Patterns
- preg_replace_callback() - Perform a regular expression search and replace using a callback
- preg_quote() - Quote regular expression characters
- preg_replace() - Perform a regular expression search and replace
- preg_last_error() - Returns the error code of the last PCRE regex execution
- Anonymous functions
add a note
User Contributed Notes 3 notes
Sz. ¶
6 years ago
drevilkuko at gmail dot com ¶
8 years ago
finally!!!
before (<=php5.6):
<?php
$htmlString = preg_replace_callback(
'/(href="?)(\S+)("?)/i',
function (&$matches) {
return $matches[1] . urldecode($matches[2]) . $matches[3];
},
$htmlString
);
$htmlString = preg_replace_callback(
'/(href="?\S+)(%24)(\S+)?"?/i', // %24 = $
function (&$matches) {
return urldecode($matches[1] . '$' . $matches[3]);
},
$htmlString
);
?>
php7
<?php
$htmlString = preg_replace_callback_array(
[
'/(href="?)(\S+)("?)/i' => function (&$matches) {
return $matches[1] . urldecode($matches[2]) . $matches[3];
},
'/(href="?\S+)(%24)(\S+)?"?/i' => function (&$matches) {
return urldecode($matches[1] . '$' . $matches[3]);
}
],
$htmlString
);
?>
jfcherng at NOSPAM dot gmail dot com ¶
8 years ago
Here's a possible alternative in older PHP.
<?php
// if (!function_exists('preg_replace_callback_array')) {
function preg_replace_callback_array (array $patterns_and_callbacks, $subject, $limit=-1, &$count=NULL) {
$count = 0;
foreach ($patterns_and_callbacks as $pattern => &$callback) {
$subject = preg_replace_callback($pattern, $callback, $subject, $limit, $partial_count);
$count += $partial_count;
}
return preg_last_error() == PREG_NO_ERROR ? $subject : NULL;
}
// }
?>
