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run code in 200+ php & hhvm versions
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<?php $foo = array(1, 2, 3, 4, 5); unset($foo[2]); var_dump($foo);
Output for 4.3.0 - 7.1.10
array(4) { [0]=> int(1) [1]=> int(2) [3]=> int(4) [4]=> int(5) }