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run code in 200+ php & hhvm versions
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<?php var_dump(str_getcsv(null));
based on j4BrV
Output for 5.6.30, hhvm-3.21.3 - 3.22.0, 7.0.30 - 7.3.0beta1
array(1) { [0]=> NULL }
Output for hhvm-3.18.5
Warning: str_getcsv() expects parameter 1 to be string, null given in /in/1ZNoX on line 3 NULL