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run code in 300+ PHP versions simultaneously
<?php $str = 'The quick brown fox jumps over the lazy dog'; echo preg_replace_callback('/fox|dog/', function($matches){ $a = $matches[0]; return '=>'.$a[0].'...'.$a[strlen($a)-1].'<='; }, $str);

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37.74 ms | 402 KiB | 5 Q