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run code in 200+ php & hhvm versions
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<?php $a = "1234567890"; $a .= "a"; var_dump($a["010"], isset($a["010"])); // true
Output for 5.6.0 - 5.6.30, 7.0.0 - 7.3.0alpha1
string(1) "a" bool(true)
Output for hhvm-3.15.4
string(1) "a" bool(false)