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run code in 150+ php & hhvm versions
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<?php $string = 'äëïöü'; $len = strlen($string); $mbLen = mb_strlen($string); var_dump($len, $mbLen);
Output for 5.6.7 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(10) int(5)
Output for 4.3.0 - 5.5.35
int(10) int(10)