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<?php $test = array(); $test[5] = 'test'; if(array_key_exists(5,$test)){ echo '5 exists<br>'; } if(array_key_exists(2,$test)){ echo '2 exists<br>'; } if(array_key_exists(10,$test)){ echo '10 exists <br>'; }
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
5 exists<br>