Online PHP editor | output for sLGA8

Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: Fatal error: Uncaught Error: [] operator not supported for strings in /in/sLGA8:6 Stack trace: #0 [internal function]: {closure}(Array) #1 /in/sLGA8(5): preg_replace_callback('/\\[(.*?)\\]/', Object(Closure), '[1,1x,1x,1x][2,...') #2 {main} thrown in /in/sLGA8 on line 6
Process exited with code 255.
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28: Fatal error: Uncaught Error: [] operator not supported for strings in /in/sLGA8:6 Stack trace: #0 [internal function]: {closure}(Array) #1 /in/sLGA8(7): preg_replace_callback('/\\[(.*?)\\]/', Object(Closure), '[1,1x,1x,1x][2,...') #2 {main} thrown in /in/sLGA8 on line 6
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.37, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20: Array ( [0] => Array ( [0] => [1] [1] => [1x] [2] => [1x] [3] => [1x] ) [1] => Array ( [0] => [2] [1] => [2x] [2] => [2x] [3] => [2x] ) ) array(2) { [0]=> array(4) { [0]=> string(3) "[1]" [1]=> string(4) "[1x]" [2]=> string(4) "[1x]" [3]=> string(4) "[1x]" } [1]=> array(4) { [0]=> string(3) "[2]" [1]=> string(4) "[2x]" [2]=> string(4) "[2x]" [3]=> string(4) "[2x]" } }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17: Parse error: syntax error, unexpected T_FUNCTION in /in/sLGA8 on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5: Parse error: parse error, unexpected T_FUNCTION in /in/sLGA8 on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error in /in/sLGA8 on line 5
Process exited with code 255.