Sharing of short URL algorithm implemented in PHP_PHP tutorial

Replace each URL with 6 characters, (6^32) and you can have up to 1,073,741,824 short URLs.
Of course, you can also record more detailed information, such as access records, creation time, etc.
If you really don’t have enough, you can delete the ones you haven’t used for a long time.

Copy code The code is as follows:

function shorturl($input) {
$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'
);

$hex = md5($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;
}

Test code:

Copy code The code is as follows:

$input = 'http://www.jb51.net/1';
$output = shorturl($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.jb51.net/2';
$output = shorturl($input);

echo "Input : $inputn";
echo "Output : {$output[0]}n";
echo " {$output[1]}n";
echo " {$output[2]}n";
echo " {$output[3]}n";
echo "n";

Output:

Copy code The code is as follows:

Input: http://www.jb51.net/1
Output: h0xg4r
bdr3tw
osk2d3
4azfqa

Input: http://www.jb51.net/2
Output: tm5kxb
ceoj2s
yw3dvl
nrmrxl

http://www.bkjia.com/PHPjc/825414.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/825414.htmlTechArticleReplace each URL with 6 characters, (6^32) and you can have up to 1,073,741,824 short URLs. Of course, you can also record more detailed information, such as access records, creation time, etc. If true...