3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function do_split($name) { return preg_split('/([A-Z]{2,}|([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) ) ); } $samples = array( 'FooBar', 'FooBAR', 'FOObar', 'foo_bar', 'foo_bar', ); print_r(array_map(function ($name) { return array( 'name' => $name, 'split' => do_split($name), 'converted' => convert_case($name), ); }, $samples));
based on 8ihbN
Output for 5.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Array ( [0] => Array ( [name] => FooBar [split] => Array ( [0] => Foo [1] => Foo [2] => Bar [3] => Bar ) [converted] => foo_foo_bar_bar ) [1] => Array ( [name] => FooBAR [split] => Array ( [0] => Foo [1] => Foo [2] => BAR ) [converted] => foo_foo_bar ) [2] => Array ( [name] => FOObar [split] => Array ( [0] => FOO [1] => bar ) [converted] => foo_bar ) [3] => Array ( [name] => foo_bar [split] => Array ( [0] => foo_bar ) [converted] => foo_bar ) [4] => Array ( [name] => foo_bar [split] => Array ( [0] => foo_bar ) [converted] => foo_bar ) )
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION, expecting ')' in /in/M3SVS on line 27
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/M3SVS on line 27
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/M3SVS on line 27
Process exited with code 255.