PHP short URL algorithm example code sharing_PHP tutorial

The short URL algorithm implemented by PHP theoretically supports 1,073,741,824 short URLs.

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.

<span>function</span> shorturl(<span>$input</span><span>) {
</span><span>$base32</span> = <span>array</span><span> (
</span>'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'<span>
);

</span><span>$hex</span> = <span>md5</span>(<span>$input</span><span>);
</span><span>$hexLen</span> = <span>strlen</span>(<span>$hex</span><span>);
</span><span>$subHexLen</span> = <span>$hexLen</span> / 8<span>;
</span><span>$output</span> = <span>array</span><span>();

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

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

</span><span>$output</span>[] = <span>$out</span><span>;
}

</span><span>return</span> <span>$output</span><span>;
}</span>

Test code:

<span>$input</span> = 'http://www.jbxue.com/1'<span>;
</span><span>$output</span> = shorturl(<span>$input</span><span>);

</span><span>echo</span> "Input : <span>$input</span>\n"<span>;
</span><span>echo</span> "Output : {<span>$output</span>[0]}\n"<span>;
</span><span>echo</span> " {<span>$output</span>[1]}\n"<span>;
</span><span>echo</span> " {<span>$output</span>[2]}\n"<span>;
</span><span>echo</span> " {<span>$output</span>[3]}\n"<span>;
</span><span>echo</span> "\n"<span>;

</span><span>$input</span> = 'http://www.jbxue.com/2'<span>;
</span><span>$output</span> = shorturl(<span>$input</span><span>);

</span><span>echo</span> "Input : <span>$input</span>\n"<span>;
</span><span>echo</span> "Output : {<span>$output</span>[0]}\n"<span>;
</span><span>echo</span> " {<span>$output</span>[1]}\n"<span>;
</span><span>echo</span> " {<span>$output</span>[2]}\n"<span>;
</span><span>echo</span> " {<span>$output</span>[3]}\n"<span>;
</span><span>echo</span> "\n";

Output:

Input : http://www.jbxue.com/1
Output : h0xg4r
bdr3tw
osk2d3
4azfqa

Input : http://www.jbxue. com/2
Output : tm5kxb
ceoj2s
yw3dvl
nrmrxl

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http://www.bkjia.com/PHPjc/815970.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/815970.htmlTechArticleThe short URL algorithm implemented by PHP theoretically supports 1,073,741,824 short URLs. Each URL is replaced with 6 characters, (6^32), and you can have up to 1,073,741,824 short URLs. Of course, you can also remember...