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<?php echo is_mumeric(null) ? 'yes' : 'no';
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.22, 7.4.0 - 7.4.10, 8.0.0alpha1 - beta3
Fatal error: Uncaught Error: Call to undefined function is_mumeric() in /in/X4o3t:3 Stack trace: #0 {main} thrown in /in/X4o3t on line 3
Process exited with code 255.