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run code in 150+ php & hhvm versions
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<?php $r = array(3, 7, 2); shuffle(array_merge(array(), $r)); var_dump($r);
based on 1BTop
Output for 7.0.0 - 7.1.0
Notice: Only variables should be passed by reference in /in/YsEsm on line 4 array(3) { [0]=> int(3) [1]=> int(7) [2]=> int(2) }
Output for 5.1.0 - 5.6.28
Strict Standards: Only variables should be passed by reference in /in/YsEsm on line 4 array(3) { [0]=> int(3) [1]=> int(7) [2]=> int(2) }
Output for 5.0.5
Fatal error: Only variables can be passed by reference in /in/YsEsm on line 4
Process exited with code 255.
Output for 4.3.0 - 5.0.4
array(3) { [0]=> int(3) [1]=> int(7) [2]=> int(2) }