在PHP中，如何使用各种字符的字符串并将其转换为只有A-Z和0-9个字符的字符串？ [重复]

Question

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how to replace special characters with the ones they’re based on in PHP?

I have a string that looks like this:

ABCÇĆDEFGHÎIïJ123450086

In PHP how can I make it appear as:

ABCDEFGHIJ123450086

without having to manually replace each character not needed. Can I use some kind of RegEx for this? How?

I just want A-Z and 0-9, no other foreign characters (as in, remove them).

Answer 1

Use character classes:

$string = preg_replace('/[^\w\d]/', '', $string);

Replaces all occurences of characters which are not ([^]) alphabetic (\w), nor a digit (\d) with an empty string.