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run code in 200+ php & hhvm versions
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<?php $foo = [1]; foreach ($foo as $bar) { if ($bar === 1) $foo[] = 2; } var_dump($foo);
based on tsrTj
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0beta1
array(2) { [0]=> int(1) [1]=> int(2) }