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run code in 150+ php & hhvm versions
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<?php echo preg_replace('/[¤]/u', 'Found!', 'ä') . "\n"; echo preg_match('/[¤]/u', 'ä');
Output for 4.3.3 - 7.1.0
ä 0
Output for 4.3.0 - 4.3.2
�Found! 1