将字符串转换为它的对应实体

Question

So I have this annonymous function that converts every character of my string into entity.

var myStr = myStr.replace(/[\u0022\u0027\u0080-\FFFF]/g, function(a) {
   return '&#' + a.charCodeAt(0) + ';';
});  

I need to do the same with PHP.
I'll have a normal string and transform it it's equivalent entity code.
e.g:

Have --> Want: Képzeld el PDF ------->Képzeld el PDF

I was reading about preg_replace_callback

Perform a regular expression search and replace using a callback

But I don't know how to apply the same thing in PHP.
I could also use the annonymous function within preg_replace, like so:

 $line = preg_replace_callback(
        '/[\u0022\u0027\u0080-\FFFF]/g',
        function ($matches) {
            return '&#' + a.charCodeAt(0) + ';';
        },
    );

I couldn't make it work or find an equivalence for charCodeAt. Even the regex range of characters are not supported by preg_replace function.

Answer 1

You could use IntlChar::ord() to find the codepoint of a character. Below is a transpiled version:

$myStr = preg_replace_callback('~[\x{0022}\x{0027}\x{0080}-\x{ffff}]~u', function ($c) {
    return '&#' . IntlChar::ord($c[0]) . ';';
}, $myStr);

See live demo