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run code in 200+ php & hhvm versions
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<?php $e = 'één boterham'; $s = htmlspecialchars($e); var_dump($s); // string '' (length=0)
Output for 4.3.0 - 5.0.5, 5.1.1 - 7.2.0
string(14) "één boterham"
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/9Pbd5 on line 6
Process exited with code 255.