IdnaEncoder::to_ascii( string $text )

Convert a UTF-8 text string to an ASCII string using Punycode


Parameters

$text

(Required) ASCII or UTF-8 string (max length 64 characters)


Return

(string) ASCII string


Source

File: wp-includes/Requests/src/IdnaEncoder.php

	public static function to_ascii($text) {
		// Step 1: Check if the text is already ASCII
		if (self::is_ascii($text)) {
			// Skip to step 7
			if (strlen($text) < self::MAX_LENGTH) {
				return $text;
			}

			throw new Exception('Provided string is too long', 'idna.provided_too_long', $text);
		}

		// Step 2: nameprep
		$text = self::nameprep($text);

		// Step 3: UseSTD3ASCIIRules is false, continue
		// Step 4: Check if it's ASCII now
		if (self::is_ascii($text)) {
			// Skip to step 7
			/*
			 * As the `nameprep()` method returns the original string, this code will never be reached until
			 * that method is properly implemented.
			 */
			// @codeCoverageIgnoreStart
			if (strlen($text) < self::MAX_LENGTH) {
				return $text;
			}

			throw new Exception('Prepared string is too long', 'idna.prepared_too_long', $text);
			// @codeCoverageIgnoreEnd
		}

		// Step 5: Check ACE prefix
		if (strpos($text, self::ACE_PREFIX) === 0) {
			throw new Exception('Provided string begins with ACE prefix', 'idna.provided_is_prefixed', $text);
		}

		// Step 6: Encode with Punycode
		$text = self::punycode_encode($text);

		// Step 7: Prepend ACE prefix
		$text = self::ACE_PREFIX . $text;

		// Step 8: Check size
		if (strlen($text) < self::MAX_LENGTH) {
			return $text;
		}

		throw new Exception('Encoded string is too long', 'idna.encoded_too_long', $text);
	}