長連接轉短連接

<?php
namespace Common\Common\ShortUrl;
/**
 長連接轉換短連接
 */
class ShortUrl
{
    #字符表
    public static $charset = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";

    public static function shortUrl($url) {
        $base32 = array (
            'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
            'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p',
            'q', 'r', 's', 't', 'u', 'v', 'w', 'x',
            'y', 'z', '0', '1', '2', '3', '4', '5'
        );

        $hex = md5($url);
        $hexLen = strlen($hex);
        $subHexLen = $hexLen / 8;
        $short_url_list = array();

        for ($i = 0; $i < $subHexLen; $i++) {
            $subHex = substr ($hex, $i * 8, 8);
            $int = 0x3FFFFFFF & (1 * ('0x'.$subHex));
            $out = '';

            for ($j = 0; $j < 6; $j++) {
                $val = 0x0000001F & $int;
                $out .= $base32[$val];
                $int = $int >> 5;
            }

            $short_url_list[] = $out;
        }

        return $short_url_list;
    }
}

 

 

參考：http://www.voidcn.com/article/p-ydjqllgt-ed.html

 

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