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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($name) ) ); } function convert_case2($in) { $len = strlen($in); if ($len < 2) { return strtolower($in); } // no state $upper = function ($c) { return 'A' <= $c && $c <= 'Z'; }; $lower = function ($c) { return 'a' <= $c && $c <= 'z'; }; $alpha = function ($c) use ($upper, $lower) { return $upper($c) || $lower($c); }; $num = function ($c) { return '0' <= $c && $c <= '9'; }; $alpha_num = function ($c) use ($alpha, $num) { return $alpha($c) || $num($c); }; // stream state $pos = 0; $char = $in[0]; $peek = function() use ($in, &$pos, $len) { if ($pos+1 >= $len) { return null; } return $in[$pos+1]; }; $next = function() use ($peek, &$pos, &$char) { $char = $peek(); $pos++; return $char !== null; }; // lex state $out = ''; $find_start = function () use (&$char, $alpha_num, $next) { while (!$alpha_num($char)) { if (!$next()) { return null; } } echo "START: $char"; return null; }; $state = $find_start; while ($state !== null) { $state = $state(); } return strtolower($out); } convert_case2('FooBARbar0123'); $samples = array( 'FooBar', 'FooBAR', 'FOOBar', 'foo_bar', 'FOO_bar', 'FOO_Bar', 'foo_BAR', 'foo_Bar', 'Foo_bar', ); print_r(array_map(function ($name) { return array( 'name' => $name, 'converted' => convert_case2($name), // 'converted' => convert_case($name), ); }, $samples));
based on L3FDk
Output for 5.3.0 - 7.1.0
START: FSTART: FSTART: FSTART: FSTART: fSTART: FSTART: FSTART: fSTART: fSTART: FArray ( [0] => Array ( [name] => FooBar [converted] => ) [1] => Array ( [name] => FooBAR [converted] => ) [2] => Array ( [name] => FOOBar [converted] => ) [3] => Array ( [name] => foo_bar [converted] => ) [4] => Array ( [name] => FOO_bar [converted] => ) [5] => Array ( [name] => FOO_Bar [converted] => ) [6] => Array ( [name] => foo_BAR [converted] => ) [7] => Array ( [name] => foo_Bar [converted] => ) [8] => Array ( [name] => Foo_bar [converted] => ) )
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/l49l2 on line 24
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 in /in/l49l2 on line 24
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/l49l2 on line 24
Process exited with code 255.