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<?php preg_match_all('/[\x{0080}-\x{ffff}]/u', 'café', $matches, PREG_OFFSET_CAPTURE); var_dump($matches);
based on sajNA
Output for 4.3.3 - 7.2.0
array(1) { [0]=> array(1) { [0]=> array(2) { [0]=> string(2) "é" [1]=> int(3) } } }
Output for 4.3.0 - 4.3.2
Warning: Wrong value for parameter 4 in call to preg_match_all() in /in/0h8hn on line 4 NULL