Punycode

An implementation of RFC 3492 Punycode in PHP, based on the sample implementation in Appendix C. This is NOT a substitue for idn_to_ascii and idn_to_utf8.

Requirements

• PHP 7.1+

Installation

composer require rowbot/punycode

API

Punycode::decode(string $input, int $outLength = null, array &$caseFlags = [])

The Punycode::decode() method takes an ASCII encoded string and decodes it to a UTF-8 encoded string. Optionally, the second parameter can be specified to place a limit on the size of the returned string.

Parameters

• $input - An ASCII encoded punycode string to convert to a UTF-8 encoded string.
• $outLength - A positive integer representing the maximum length, in code points, of the resulting output string. Defaults to 2,147,483,647.
• $caseFlags - An array, which will have the case flag of each character inserted into it.

Throws

• \Rowbot\Punycode\Exception\OutputSizeExceededException - If the size of the output string exceeds the maximum size specified.
• \Rowbot\Punycode\Exception\OverflowException - If integer overflow occurs.
• \Rowbot\Punycode\Exception\InvalidInputException - If input contains non-ASCII bytes or mapping a code point to a digit fails.

use Rowbot\Punycode\Punycode;

try {
    echo Punycode::decode('Hello-Another-Way--fc4qua05auwb3674vfr0b'); // Hello-Another-Way-それぞれの場所
} catch (\Rowbot\Punycode\Exception\PunycodeException $e) {
    echo 'An error occured!';
}

Punycode::encode(string $input, int $outLength = null, array $caseFlags = [])

The Punycode::encode() method takes a UTF-8 encoded string and converts it into an ASCII encoded punycode string. Optionally, the second parameter can be specified to place a limit on the size of the returned string.

Parameters

• $input - A UTF-8 encoded string to convert to punycode.
• $outLength - A positive integer representing the maximum length, in code points, of the resulting output string. Defaults to 2,147,483,647.
• $caseFlags - An array of bools where true indicates that the character should be uppercase and false indicates that it should be lowercase. This only affects ASCII characters [a-zA-Z].

Throws

• \Rowbot\Punycode\Exception\OutputSizeExceededException - If the size of the output string exceeds the maximum size specified.
• \Rowbot\Punycode\Exception\OverflowException - If integer overflow occurs.

use Rowbot\Punycode\Punycode;

try {
    echo Punycode::encode('Hello-Another-Way-それぞれの場所'); // Hello-Another-Way--fc4qua05auwb3674vfr0b
} catch (\Rowbot\Punycode\Exception\PunycodeException $e) {
    echo 'An error occured!';
}