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
$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
- 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