Php url Shortening code (generate short url)

Each URL is replaced by 6 characters, and (32 ^ 6) can have up to 1,073,741,824 short URLs. Of course, you can also record more detailed information, such as access records and creation time. If it is not enough, you can delete it for a long time.

The code is as follows:

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Function compute URL ($ input ){ $ Base32 = array ( 'A', 'B', 'C', 'D', 'e', '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 ($ input ); $ HexLen = strlen ($ hex ); $ SubHexLen = $ hexLen/8; $ Output = 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;     } $ Output [] = $ out;   } Return $ output; } Sample code to test/use the above function: $ Input = 'http: // www.111cn.net/1 '; $ Output = response URL ($ input ); Echo "Input: $ inputn "; Echo "Output: {$ output [0]} n "; Echo "{$ output [1]} n "; Echo "{$ output [2]} n "; Echo "{$ output [3]} n "; Echo "n "; $ Input = 'http: // www.111cn.net/2 '; $ Output = response URL ($ input ); Echo "Input: $ inputn "; Echo "Output: {$ output [0]} n "; Echo "{$ output [1]} n "; Echo "{$ output [2]} n "; Echo "{$ output [3]} n "; Echo "n "; Output: Input: http://www.111cn.net/1 Output: h0xg4r Bdr3tw Osk2d3 4 azfqa Input: http://www.111cn.net/2 Output: tm5kxb Ceoj2s Yw3dvl Nrmrxl