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(PHP 7, PHP 8)
preg_replace_callback_array — Perform a regular expression search and replace using callbacks
$pattern,$subject,$limit = -1,&$count = null,$flags = 0The behavior of this function is similar to preg_replace_callback(), except that callbacks are executed on a per-pattern basis.
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
subject string. Defaults to
-1 (no limit).
count
If specified, this variable will be filled with the number of replacements done.
flags
flags can be a combination of the
PREG_OFFSET_CAPTURE and
PREG_UNMATCHED_AS_NULL flags, which influence the
format of the matches array.
See the description in preg_match() for more details.
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.
如果传递的正则表达式无法正常解析，会发出 E_WARNING。
| 版本 | 说明 |
|---|---|
| 7.4.0 |
The flags parameter was added.
|
示例 #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
);
?>
以上例程会输出：
6 matches for "a" found 3 matches for "b" found
