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run code in 300+ PHP versions simultaneously
<?php $_ = array(); for($i=0;$i<10;$i++) $_[$s?:(key($_)+1)] = "lol"; var_dump($_);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $s in /in/aP1os on line 4 Warning: Undefined variable $s in /in/aP1os on line 4 Warning: Undefined variable $s in /in/aP1os on line 4 Warning: Undefined variable $s in /in/aP1os on line 4 Warning: Undefined variable $s in /in/aP1os on line 4 Warning: Undefined variable $s in /in/aP1os on line 4 Warning: Undefined variable $s in /in/aP1os on line 4 Warning: Undefined variable $s in /in/aP1os on line 4 Warning: Undefined variable $s in /in/aP1os on line 4 Warning: Undefined variable $s in /in/aP1os on line 4 array(2) { [1]=> string(3) "lol" [2]=> string(3) "lol" }

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