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Bugs & Features
<?php array_flip( array( 0=> NULL ) );
Output for 4.3.2 - 7.2.0
Warning: array_flip(): Can only flip STRING and INTEGER values! in /in/34rai on line 2
Output for 4.3.0 - 4.3.1
Warning: array_flip() [http://www.php.net/function.array-flip]: Can only flip STRING and INTEGER values! in /in/34rai on line 2