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run code in 150+ php & hhvm versions
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<?php function do_split($name) { return preg_split('/(([A-Z])[^A-Z]*)/', $name, null, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY); } function convert_case($name) { return implode( '_', array_map( 'strtolower', do_split($name) ) ); } $samples = array( 'FooBar', 'FooBAR', 'FOObar', ); print_r(array_map(function ($name) { return array( 'name' => $name, 'split' => do_split($name), 'converted' => convert_case($name), ); }, $samples));
based on ogc6b
Output for 5.3.0 - 5.6.28, hhvm-3.10.0, 7.0.0 - 7.1.0
Array ( [0] => Array ( [name] => FooBar [split] => Array ( [0] => Foo [1] => F [2] => Bar [3] => B ) [converted] => foo_f_bar_b ) [1] => Array ( [name] => FooBAR [split] => Array ( [0] => Foo [1] => F [2] => B [3] => B [4] => A [5] => A [6] => R [7] => R ) [converted] => foo_f_b_b_a_a_r_r ) [2] => Array ( [name] => FOObar [split] => Array ( [0] => F [1] => F [2] => O [3] => O [4] => Obar [5] => O ) [converted] => f_f_o_o_obar_o ) )
Output for hhvm-3.12.0 - 3.13.2
Warning: preg_split() expects parameter 3 to be integer, null given in /in/17C19 on line 4 Warning: preg_split() expects parameter 3 to be integer, null given in /in/17C19 on line 4 Warning: array_map(): Argument #2 should be an array or collection Warning: Invalid operand type was used: implode() expects a container as one of the arguments in /in/17C19 on line 14 Warning: preg_split() expects parameter 3 to be integer, null given in /in/17C19 on line 4 Warning: preg_split() expects parameter 3 to be integer, null given in /in/17C19 on line 4 Warning: array_map(): Argument #2 should be an array or collection Warning: Invalid operand type was used: implode() expects a container as one of the arguments in /in/17C19 on line 14 Warning: preg_split() expects parameter 3 to be integer, null given in /in/17C19 on line 4 Warning: preg_split() expects parameter 3 to be integer, null given in /in/17C19 on line 4 Warning: array_map(): Argument #2 should be an array or collection Warning: Invalid operand type was used: implode() expects a container as one of the arguments in /in/17C19 on line 14 Array ( [0] => Array ( [name] => FooBar [split] => [converted] => ) [1] => Array ( [name] => FooBAR [split] => [converted] => ) [2] => Array ( [name] => FOObar [split] => [converted] => ) )
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION, expecting ')' in /in/17C19 on line 25
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION, expecting ')' in /in/17C19 on line 25
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/17C19 on line 25
Process exited with code 255.