PHP preg_filter()代替PHP <5.3？

Question

不得不将PHP代码部署到只有PHP5.2.8的共享服务器上.对于preg_filter()在5.3+中添加的调用,所有代码的工作都是EXCEPT (代码编写时也是如此).

任何人都可以preg_filter()在PHP5.2中推荐一个简单的替代品吗？

Answer 1

PHP手册说它preg_filter()是相同的,preg_replace()只是它只返回匹配.

因此,您可以结合使用preg_replace和array_diff获取结果,如PHP 5.2.x中的preg_filter.像这样做:

<?php
$subject = array('1', 'a', '2', 'b', '3', 'A', 'B', '4'); 
$pattern = array('/\d/', '/[a-z]/', '/[1a]/'); 
$replace = array('A:$0', 'B:$0', 'C:$0'); 

$result = preg_replace($pattern, $replace, $subject);
var_dump($result);

//take difference of preg_replace result and subject
$preg_filter_similar = array_diff($result, $subject);

var_dump($preg_filter_similar);
?>

这给出了输出(安装了xDebug):

array
  0 => string 'A:C:1' (length=5)
  1 => string 'B:C:a' (length=5)
  2 => string 'A:2' (length=3)
  3 => string 'B:b' (length=3)
  4 => string 'A:3' (length=3)
  5 => string 'A' (length=1)
  6 => string 'B' (length=1)
  7 => string 'A:4' (length=3)
array
  0 => string 'A:C:1' (length=5)
  1 => string 'B:C:a' (length=5)
  2 => string 'A:2' (length=3)
  3 => string 'B:b' (length=3)
  4 => string 'A:3' (length=3)
  7 => string 'A:4' (length=3)

与preg_filter()输出相同:

Array
(
    [0] => A:C:1
    [1] => B:C:a
    [2] => A:2
    [3] => B:b
    [4] => A:3
    [7] => A:4
)