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@ 2014-08-08T17:23:45Z

<?php

$array = array( 'Foo' => NULL );

for( $i = 0; $i <= 10000; $i += 1 ) {

    var_dump( isset( $array['Foo'] ) );
}

Output
Performance
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var_dump: documentation ( source)

preferences:dark modelive preview

41.93 ms | 402 KiB | 5 Q