Online PHP editor | output for JI7vJ

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: strrev(): Argument #1 ($string) must be of type string, array given in /in/JI7vJ:4 Stack trace: #0 [internal function]: strrev(Array) #1 /in/JI7vJ(4): preg_replace_callback('#([A-Za-z]+)#', 'strrev', 'word,!pineapple...') #2 {main} thrown in /in/JI7vJ on line 4
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33: Warning: strrev() expects parameter 1 to be string, array given in /in/JI7vJ on line 4 Warning: strrev() expects parameter 1 to be string, array given in /in/JI7vJ on line 4 Warning: strrev() expects parameter 1 to be string, array given in /in/JI7vJ on line 4 string(4) ",!--"
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: Notice: Array to string conversion in /in/JI7vJ on line 4 Notice: Array to string conversion in /in/JI7vJ on line 4 Notice: Array to string conversion in /in/JI7vJ on line 4 string(19) "yarrA,!yarrA--yarrA"