IdnaEncoder::is_ascii( string $text )
Check whether a given text string contains only ASCII characters
Parameters
- $text
-
(Required) Text to examine.
Return
(bool) Is the text string ASCII-only?
Source
File: wp-includes/Requests/src/IdnaEncoder.php
protected static function is_ascii($text) {
return (preg_match('/(?:[^\x00-\x7F])/', $text) !== 1);
}