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思路一:
<?php function shorturl($url=‘‘) { $base = 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" , "6" , "7" , "8" , "9" , "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"); $hex = md5($url); $hexLen = strlen($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 = 0x0000003D & $int;//因为6个字符的每个字符有26+26+10个组合 $out .= $base[$val]; $int = $int >> 5;//取$int30位长度,每次右移5位,正好可以得到6个组 } $output[] = $out; } return $output; } $urls = shorturl(‘http://www.php100.com‘); echo "<pre>";var_dump($urls);exit(); ?>
思路二:
另一种是存数据库中,取自增ID,进行10=》62进制转换,结果为短网址,访问时再从数据库取得真实地址。
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原文地址:http://www.cnblogs.com/thinksasa/p/4248941.html