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run code in 150+ php & hhvm versions
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<?php $config['debug'] = array( 'type' => array( 'remote_specific' => true, 'remote_addr' => '1.2.3.4', ) , 'mode' => array( 'PHP' => $config ) );
Output for 5.0.4 - 5.0.5, 7.0.0 - 7.1.0
Notice: Undefined variable: config in /in/StIfu on line 8
Output for 5.1.0 - 5.6.28
Notice: Undefined variable: config in /in/StIfu on line 9
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: config in /in/StIfu on line 8