Fetch short URL using git.io

GitHub_URL.php

<?php

class GitHub_URL {
	protected $long;

	public function __construct( $url ) {
		$this->long = $url;
	}

	public function long() {
		return $this->long;
	}

	public function short() {
		$ch = curl_init( 'http://git.io/' );

		curl_setopt( $ch, CURLOPT_RETURNTRANSFER, true );
		curl_setopt( $ch, CURLOPT_POSTFIELDS, array( 'url' => $this->long() ) );
		curl_setopt( $ch, CURLOPT_HEADER, true );

		$response = curl_exec( $ch );
		$headers = explode( "\r\n", $response );

		foreach( $headers as $header ) {
			if( false === strpos( $header, ': ' ) ) {
				continue;
			}

			list( $key, $value ) = explode( ': ', $header, 2 );

			if( 'Location' === $key ) {
				return $value;
			}
		}
	}

	public function __toString() {
		return $this->long();
	}
}