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<?php $test = array( "contentIds" => array( ), "locationIds" => array( ) ); var_dump( array_flip( $test ) );
Output for git.master, git.master_jit, rfc.property-hooks
Warning: array_flip(): Can only flip string and integer values, entry skipped in /in/AmvPO on line 9 Warning: array_flip(): Can only flip string and integer values, entry skipped in /in/AmvPO on line 9 array(0) { }

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