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run code in 200+ php & hhvm versions
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<?php print_r(preg_split("/\W+/u", "tétât"));
Output for 5.3.4 - 7.2.0
Array ( [0] => tétât )
Output for 4.3.0 - 5.3.3
Array ( [0] => t [1] => t [2] => t )