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Requests_IDNAEncoder::is_ascii( string $string )

Check whether a given string contains only ASCII characters

Parameters

$string

(string) (Required)

Return

(bool) Is the string ASCII-only?

Source

File: wp-includes/Requests/IDNAEncoder.php 

protected static function is_ascii($string) {
		return (preg_match('/(?:[^\x00-\x7F])/', $string) !== 1);
	}

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Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/classes/requests_idnaencoder/is_ascii