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run code in 200+ php & hhvm versions
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<?php $x = "you’re mistaken"; var_dump(str_replace("’", "'", $x));
Output for 4.3.0 - 5.6.30, hhvm-3.10.1 - 3.22.0, 7.0.0 - 7.3.0rc3
string(15) "you're mistaken"