PHP：替换字符串中的外来字符

Question

$fileSyntax = strtolower(preg_replace('~&([a-z]{1,2})(acute|cedil|circ|grave|lig|orn|ring|slash|th|tilde|uml);~i', '$1', htmlentities($fileSyntax, ENT_QUOTES, 'UTF-8'))); // remove foreign character accents
$fileSyntax = preg_replace("/[^a-zA-Z0-9\s]/", "", $fileSyntax); // remove anything that's not alphanumeric, or a space
$fileSyntax = preg_replace("/\s+/", "-", $fileSyntax); // replace space with hyphen     
$fileSyntax = trim($fileSyntax, "-"); // removes prefixing and trailing hyphen

The above code will produce the following:

Pokémon = pokemon
YO MAN! = yo-man

I want to rewrite this for efficiency and convert it into a function soon thereafter.

How can I utilize more than one preg_replace() so this will not be a multi-line code?

Answer 1

just so you know, this line:

$fileSyntax = preg_replace("/[^a-zA-Z0-9\s]/", "", $fileSyntax);

should include hyphens, or you're going to stop people being able to type ice-skate and it'll become iceskate, for instance.

$fileSyntax = preg_replace("/[^a-zA-Z0-9\s-]/", "", $fileSyntax);

spaces should really be replaced with underscores (in my opinion) since hyphens can be used in words.

also you could do this for your function:

function replace_chars($fileSyntax){
    return strtolower(
        preg_replace(
            array(
                "/&([a-z]{1,2})(acute|cedil|circ|grave|lig|orn|ring|slash|th|tilde|uml);/i",
                "/[^a-zA-Z0-9\s-]/i",
                "/\s+/"
            ),
            array(
                "$1", // remove foreign character accents
                "", // remove anything that's not alphanumeric, hyphen or a space
                "_" // replace space with underscore 
            ), htmlentities($fileSyntax, ENT_QUOTES, 'UTF-8')
        )
    );
}

It's all technically one line of code, just spaced so that it's easy to read and understand what is going on. You'd call it by going replace_chars("TeRríbLé(!) STRinG :)"); which should return terrible_string