mb_ereg_replace_callback

(PHP 5 >= 5.4.1, PHP 7)

mb_ereg_replace_callback — Perform a regular expression search and replace with multibyte support using a callback

说明

mb_ereg_replace_callback ( string $pattern , callable $callback , string $string [, string $option = "msr" ] ) : string

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

The search option. See mb_regex_set_options() for explanation.

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

相关文章
php 多字节字符串 函数 转换字符的编码php 多字节字符串 函数 convert kana one from another zen kaku han kaku and more php 多字节字符串 函数 regular expression match for multibyte stringphp 多字节字符串 函数 perform a regular expression search and replace with multibyte support using a callbackphp 多字节字符串 函数 replace regular expression with multibyte supportphp 多字节字符串 函数 returns start point for next regular expression matchphp 多字节字符串 函数 retrieve the result from the last multibyte regular expression matchphp 多字节字符串 函数 setup string and regular expression for a multibyte regular expression matchphp 多字节字符串 函数 returns position and length of a matched part of the multibyte regular expression for a predefined multibyte stringphp 多字节字符串 函数 returns the matched part of a multibyte regular expressionphp 多字节字符串 函数 set start point of next regular expression matchphp 多字节字符串 函数 multibyte regular expression match for predefined multibyte stringphp 多字节字符串 函数 regular expression match with multibyte supportphp 多字节字符串 函数 replace regular expression with multibyte support ignoring casephp 多字节字符串 函数 regular expression match ignoring case with multibyte supportphp 多字节字符串 函数 获取 mime 字符串php 多字节字符串 函数 set/get character encoding for multibyte regexphp 多字节字符串 函数 查找字符串在另一个字符串里的首次出现php 字符串 函数 转换字符串第一个字节为 0 255 之间的值php pcre 函数 perform a regular expression search and replace using callbacks
关注编程学问公众号