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run code in 150+ php & hhvm versions
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<?php print_r(preg_split("/[[:alpha:]]+/u", "histórica"));
Output for 5.3.4 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => [1] => )
Output for 4.3.0 - 5.3.3
Array ( [0] => [1] => ó [2] => )