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copied!<p>PHP manual says that <code>preg_filter()</code> is identical to <code>preg_replace()</code> except it only returns the matches.</p> <p>So, you can use a combination of <a href="http://php.net/preg_replace" rel="noreferrer"><code>preg_replace</code></a> and <a href="http://php.net/array_diff" rel="noreferrer"><code>array_diff</code></a> to get results like preg_filter in PHP 5.2.x. Do it like this:</p> <pre><code><?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); ?> </code></pre> <p>This gives the output (with xDebug installed):</p> <pre><code>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) </code></pre> <p>Which is same as <a href="http://php.net/manual/en/function.preg-filter.php" rel="noreferrer"><code>preg_filter()</code> output</a>:</p> <pre><code>Array ( [0] => A:C:1 [1] => B:C:a [2] => A:2 [3] => B:b [4] => A:3 [7] => A:4 ) </code></pre>

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