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run code in 200+ php & hhvm versions
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<?php var_dump( array_combine(['re', 're', 're'], [1, 2]) );
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.1
Warning: array_combine(): Both parameters should have an equal number of elements in /in/nUQTX on line 4 bool(false)