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PHP:mb_ereg_replace_callback()的用法_mbstring函数
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(PHP 5 >= 5.4.1)
mb_ereg_replace_callback — Perform a regular expresssion seach and replace with multibyte support using a callback
说明 string mb_ereg_replace_callback ( string $pattern , callable $callback , string $string [, string $option = "msr" ] )Scans string for matches to pattern, then replaces the matched text with the output of callback function.
The behavior of this function is almost identical to mb_ereg_replace(), except for the fact that instead of replacement parameter, one should specify a callback.
参数pattern
The regular expression pattern.
Multibyte characters may be used in pattern.
callbackA callback that will be called and passed an array of matched elements in the subject string. The callback should return the replacement string.
You&#;ll often need the callback function for a mb_ereg_replace_callback() in just one place. In this case you can use an anonymous function to declare the callback within the call to mb_ereg_replace_callback(). By doing it this way you have all information for the call in one place and do not clutter the function namespace with a callback function&#;s name not used anywhere else.
string
The string being checked.
optionMatching condition can be set by option parameter. If i is specified for this parameter, the case will be ignored. If x is specified, white space will be ignored. If m is specified, match will be executed in multiline mode and line break will be included in &#;.&#;. If p is specified, match will be executed in POSIX mode, line break will be considered as normal character. Note that e cannot be used for mb_ereg_replace_callback().
返回值The resultant string on success, or FALSE on error.
注释Note:
mb_regex_encoding()指定的内部编码或字符编码将会当作此函数用的字符编码。
范例
Example #1 mb_ereg_replace_callback() example
<?php//thistextwasusedin//wewanttogetthisuptodatefor$text="Aprilfoolsdayis//n";$text.="Lastchristmaswas//n";//thecallbackfunctionfunctionnext_year($matches){//asusual:$matches[0]isthecompletematch//$matches[1]thematchforthefirstsubpattern//enclosedin'(...)'andsoonreturn$matches[1].($matches[2]+1);}echomb_ereg_replace_callback("(d{2}/d{2}/)(d{4})","next_year",$text);?>以上例程会输出：
Example #2 mb_ereg_replace_callback() using anonymous function supported in PHP 5.3.0 or later
<?php//thistextwasusedin//wewanttogetthisuptodatefor$text="Aprilfoolsdayis//n";$text.="Lastchristmaswas//n";echomb_ereg_replace_callback("(d{2}/d{2}/)(d{4})",function($matches){return$matches[1].($matches[2]+1);},$text);?> 参见mb_regex_encoding() - Set/Get character encoding for multibyte regex mb_ereg_replace() - Replace regular expression with multibyte support Anonymous functions callback 类型的信息
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