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mb_ereg_replace_callback

(PHP 5 >= 5.4.1)

mb_ereg_replace_callbackPerform 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.

callback

A 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.

option

Matching 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
// 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 );

?>

以上例程会输出:

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 );
?>

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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