mb_ereg_replace_callback
(PHP 5 >= 5.4.1, PHP 7, PHP 8)
mb_ereg_replace_callback — Perform a regular expression search and replace with multibyte support using a callback
说明
string
$pattern,callable
$callback,string
$string,?string
$options = null): string|false|null
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.
参数
-
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
stringstring. 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.
-
options -
The search option. See mb_regex_set_options() for explanation.
返回值
The resultant string on success, or false on error.
If string is not valid for the current encoding, null
is returned.
更新日志
| 版本 | 说明 |
|---|---|
| 8.0.0 |
options is nullable now.
|
| 7.1.0 |
The function checks whether string is valid for the
current encoding.
|
示例
示例 #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);
?>以上示例会输出：
April fools day is 04/01/2003 Last christmas was 12/24/2002
示例 #2 mb_ereg_replace_callback() using anonymous function
<?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);
?>注释
注意:
mb_regex_encoding() 指定的内部编码或字符编码将会当作此函数用的字符编码。
参见
- mb_regex_encoding() - Set/Get character encoding for multibyte regex
- mb_ereg_replace() - Replace regular expression with multibyte support
- Anonymous functions
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