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<?php var_dump(implode(array('a', 'b'), array('c', 'd')));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught TypeError: implode(): Argument #1 ($separator) must be of type string, array given in /in/BQrJ9:3 Stack trace: #0 /in/BQrJ9(3): implode(Array, Array) #1 {main} thrown in /in/BQrJ9 on line 3
Process exited with code 255.
Output for 7.4.0 - 7.4.33
Notice: Array to string conversion in /in/BQrJ9 on line 3 Deprecated: implode(): Passing glue string after array is deprecated. Swap the parameters in /in/BQrJ9 on line 3 string(7) "aArrayb"
Output for 7.3.32 - 7.3.33
string(7) "aArrayb"
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31
Notice: Array to string conversion in /in/BQrJ9 on line 3 string(7) "aArrayb"

preferences:
325.18 ms | 405 KiB | 458 Q