簡単です：
function clean($string) {
$string = str_replace(' ', '-', $string); // Replaces all spaces with hyphens.
return preg_replace('/[^A-Za-z0-9\-]/', '', $string); // Removes special chars.
}
使用法：
echo clean('a|"[email protected]£de^&$f g');
出力されます：abcdef-g
編集 ：
Hey, just a quick question, how can I prevent multiple hyphens from being next to each other? and have them replaced with just 1? Thanks in advance!
function clean($string) {
$string = str_replace(' ', '-', $string); // Replaces all spaces with hyphens.
$string = preg_replace('/[^A-Za-z0-9\-]/', '', $string); // Removes special chars.
return preg_replace('/-+/', '-', $string); // Replaces multiple hyphens with single one.
}