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run code in 150+ php & hhvm versions
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<?php $la_prueba=array('codest'=>'001','codnomdes'=>'0001','codest2'=>'001','codnomdes2'=>'0001','codest3'=>'001','codnomdes3'=>'0001','codest4'=>'001','codnomdes4'=>'0001','codest5'=>'001','codnomdes6'=>'0001','codest7'=>'001','codnomdes7'=>'0001','codest8'=>'001','codnomdes8'=>'0001','codnominas'=>'0001-0004-0005')?>; var_dump(array_key_exists("codnominas",$la_prueba));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
; var_dump(array_key_exists("codnominas",$la_prueba));