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<?php echo preg_replace_callback('/(_?[a-z])/', function($u) { var_dump($u); return str_replace('', '_', strtoupper($u)); } , 'rob_tr');
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(2) { [0]=> string(1) "r" [1]=> string(1) "r" } Fatal error: Uncaught TypeError: strtoupper(): Argument #1 ($string) must be of type string, array given in /in/chhcs:12 Stack trace: #0 /in/chhcs(12): strtoupper(Array) #1 [internal function]: {closure}(Array) #2 /in/chhcs(6): preg_replace_callback('/(_?[a-z])/', Object(Closure), 'rob_tr') #3 {main} thrown in /in/chhcs on line 12
Process exited with code 255.
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28
array(2) { [0]=> string(1) "r" [1]=> string(1) "r" } Fatal error: Uncaught TypeError: strtoupper(): Argument #1 ($string) must be of type string, array given in /in/chhcs:12 Stack trace: #0 /in/chhcs(12): strtoupper(Array) #1 [internal function]: {closure}(Array) #2 /in/chhcs(15): preg_replace_callback('/(_?[a-z])/', Object(Closure), 'rob_tr') #3 {main} thrown in /in/chhcs on line 12
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
array(2) { [0]=> string(1) "r" [1]=> string(1) "r" } Warning: strtoupper() expects parameter 1 to be string, array given in /in/chhcs on line 12 array(2) { [0]=> string(1) "o" [1]=> string(1) "o" } Warning: strtoupper() expects parameter 1 to be string, array given in /in/chhcs on line 12 array(2) { [0]=> string(1) "b" [1]=> string(1) "b" } Warning: strtoupper() expects parameter 1 to be string, array given in /in/chhcs on line 12 array(2) { [0]=> string(2) "_t" [1]=> string(2) "_t" } Warning: strtoupper() expects parameter 1 to be string, array given in /in/chhcs on line 12 array(2) { [0]=> string(1) "r" [1]=> string(1) "r" } Warning: strtoupper() expects parameter 1 to be string, array given in /in/chhcs on line 12
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/chhcs on line 6
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/chhcs on line 6
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/chhcs on line 6
Process exited with code 255.
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