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run code in 300+ PHP versions simultaneously
<?php $a[1]=''; $b = isset($a[1]); $c = isset($a[2]); echo 'a='.$a; echo 'b='.$b;
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Array to string conversion in /in/ra0l8 on line 6 a=Arrayb=1

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