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run code in 200+ php & hhvm versions
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<?php $a=[];$a[6]=&$a; var_dump([$a,$a]);
based on j0ZQK
Output for 7.0.0 - 7.2.0
array(2) { [0]=> array(1) { [6]=> *RECURSION* } [1]=> array(1) { [6]=> *RECURSION* } }
Output for 5.4.12 - 5.6.28
array(2) { [0]=> array(1) { [6]=> &array(1) { [6]=> *RECURSION* } } [1]=> array(1) { [6]=> &array(1) { [6]=> *RECURSION* } } }
Output for 5.3.22 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/mTvKM on line 3
Process exited with code 255.