Online PHP editor | output for bXnMo

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 Error: Undefined constant "’a’" in /in/bXnMo:4 Stack trace: #0 {main} thrown in /in/bXnMo on line 4
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33: Warning: Use of undefined constant ’a’ - assumed '’a’' (this will throw an Error in a future version of PHP) in /in/bXnMo on line 4 array(4) { [0]=> int(1) [1]=> int(2) [2]=> int(3) ["’a’"]=> int(1) }
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, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20: Notice: Use of undefined constant ’a’ - assumed '’a’' in /in/bXnMo on line 4 array(4) { [0]=> int(1) [1]=> int(2) [2]=> int(3) ["’a’"]=> int(1) }