每个网址用6个字符代替,(32^6) 最多可以拥有1,073,741,824个短网址,当然,你还可以记录更详细的信息,如访问记录,创建时间等,如果真不够用了,还可以删掉很久不用的,代码如下:
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function shorturl($input) {
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$base32 = array (
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'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
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'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p',
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'q', 'r', 's', 't', 'u', 'v', 'w', 'x',
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'y', 'z', '0', '1', '2', '3', '4', '5'
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);
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$hex = md5($input);
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$hexLen = strlen($hex);
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$subHexLen = $hexLen / 8;
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$output = array();
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for ($i = 0; $i < $subHexLen; $i++) {
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$subHex = substr ($hex, $i * 8, 8);
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$int = 0x3FFFFFFF & (1 * ('0x'.$subHex));
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$out = '';
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for ($j = 0; $j < 6; $j++) {
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$val = 0x0000001F & $int;
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$out .= $base32[$val];
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$int = $int >> 5;
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}
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$output[] = $out;
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}
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return $output;
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}
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Sample code to test/use the above function:
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$input = 'http://www.最模板zuimoban.com /1';
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$output = shorturl($input);
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echo "Input : $inputn";
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echo "Output : {$output[0]}n";
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echo " {$output[1]}n";
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echo " {$output[2]}n";
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echo " {$output[3]}n";
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echo "n";
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$input = 'http://www.最模板zuimoban.com /2';
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$output = shorturl($input);
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echo "Input : $inputn";
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echo "Output : {$output[0]}n";
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echo " {$output[1]}n";
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echo " {$output[2]}n";
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echo " {$output[3]}n";
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echo "n";
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Output:
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Input : http:
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Output : h0xg4r
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bdr3tw
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osk2d3
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4azfqa
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Input : http:
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Output : tm5kxb
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ceoj2s
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yw3dvl
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nrmrxl
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(责任编辑:最模板) |