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<?php var_export( call_user_func_array( 'array_merge', [['a', 'b'], 'c'] ) );
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13
Fatal error: Uncaught TypeError: array_merge(): Argument #2 must be of type array, string given in /in/8M1Lt:6 Stack trace: #0 /in/8M1Lt(6): array_merge(Array, 'c') #1 {main} thrown in /in/8M1Lt on line 6
Process exited with code 255.
Output for 7.4.0 - 7.4.33
Warning: array_merge(): Expected parameter 2 to be an array, string given in /in/8M1Lt on line 6 NULL

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