3v4l.org

run code in 300+ PHP versions simultaneously
<?php function fromCamelCaseToUnderscores($str) { $str[0] = strtolower($str[0]); // Just in case first character is uppercase. $str = str_replace('ID', 'Id', $str); // Hack for the way CATS defies camelCase convention return preg_replace_callback('/([A-Z])/', function($char) { return '_' . strtolower($char[1]); }, $str); } var_dump(fromCamelCaseToUnderscores(null));
Output for 8.3.0 - 8.3.6
Warning: Trying to access array offset on null in /in/o50mS on line 5 Deprecated: strtolower(): Passing null to parameter #1 ($string) of type string is deprecated in /in/o50mS on line 5 array(1) { [0]=> string(0) "" }
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18
Warning: Trying to access array offset on value of type null in /in/o50mS on line 5 Deprecated: strtolower(): Passing null to parameter #1 ($string) of type string is deprecated in /in/o50mS on line 5 array(1) { [0]=> string(0) "" }
Output for 8.0.0 - 8.0.30
Warning: Trying to access array offset on value of type null in /in/o50mS on line 5 array(1) { [0]=> string(0) "" }
Output for 7.4.0 - 7.4.33
Notice: Trying to access array offset on value of type null in /in/o50mS on line 5 array(1) { [0]=> string(0) "" }
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33
array(1) { [0]=> string(0) "" }
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/o50mS on line 9
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/o50mS on line 9
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/o50mS on line 9
Process exited with code 255.
preferences:
297.74 ms | 401 KiB | 459 Q