如何在PHP中替换字符串中的非ASCII字符？

Question

I need to replace characters in a string which are not represented with a single byte.

My string is like this

$inputText="centralkøkkenet kliniske diætister"; 

In that string there are characters like ø and æ . These characters should be replaced. How do I mention these in a regular expression that I can use for replacement?

Answer 1

If you want to replace everything other than alphanumeric and space character then try it.

[^a-zA-Z0-9 ]

Here is demo

Sample code:

$re = "/[^a-zA-Z0-9 ]/";
$str = "centralkøkkenet kliniske diætister";
$subst = '';

$result = preg_replace($re, $subst, $str);

---

Better use [^\\w\\s] or [\\W\\S] to make it short and simple as suggested by @hjpotter92 as well in comments.

Pattern explanation:

[^\w\s]                any character except: word characters:
                        (a-z, A-Z, 0-9, _), whitespace (\n, \r, \t,\f, and " ")

[\W\S]                 any character of: 
                         non-word characters (all but a-z, A-Z, 0-9, _), 
                         non-whitespace (all but \n, \r, \t, \f, and " ")

Answer 2

If you want to keep also punctation ie.: -'"! ..., use this one:

$text = 'central-køkkenet "kliniske" diætister!';
$new = preg_replace('/[\x7F-\xFF]/ui', '', $text);
echo $new,"\n";

output:

central-kkkenet "kliniske" ditister!