-
处理页面 show.php:
- include 'functions.php';
- include 'shorturls.php';
-
- $entry = $_POST['submit'];
- $url = $_POST['url'];
- $output = '';
-
- if($entry == 'Shorten Url' AND $url)
- {
- if(!in_array($url,$shortUrls))
- {
- $uif = alphaID(count($shortUrls),false,6);
-
- if(!array_key_exists($uif,$shortUrls))
- {
- $shortUrls[$uif] = $url;
-
- $file = fopen('shorturls.php','w');
- fwrite($file,'');
- fclose($file);
- $output = 'Original Url : '.$url.'
Shorten Ulr : http://www.yourdomain.com/api/s='.$uif.''; - }
- else $output = 'access error';
- }
- else
- {
- $uif = array_search($url,$shortUrls);
- $output = 'Original Url : '.$url.'
Shorten Ulr : http://www.yourdomain.com/api/s='.$uif.''; - }
-
- echo $output.'
Back'; - }
- ?>
关联页面 functions.php
- function alphaID($in, $to_num = false, $pad_up = false, $passKey = null)
- {
- $index = "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
- if ($passKey !== null) {
- // Although this function's purpose is to just make the
- // ID short - and not so much secure,
- // with this patch by Simon Franz (http://blog.snaky.org/)
- // you can optionally supply a password to make it harder
- // to calculate the corresponding numeric ID
-
- for ($n = 0; $n
- $passhash = hash('sha256',$passKey);
- $passhash = (strlen($passhash) < strlen($index))
- ? hash('sha512',$passKey)
- : $passhash;
-
- for ($n=0; $n < strlen($index); $n++) $p[] = substr($passhash, $n ,1);
-
- array_multisort($p, SORT_DESC, $i);
- $index = implode($i);
- }
-
- $base = strlen($index);
-
- if ($to_num) {
- // Digital number <<-- alphabet letter code
- $in = strrev($in);
- $out = 0;
- $len = strlen($in) - 1;
- for ($t = 0; $t <= $len; $t++) {
- $bcpow = bcpow($base, $len - $t);
- $out = $out + strpos($index, substr($in, $t, 1)) * $bcpow;
- }
-
- if (is_numeric($pad_up)) {
- $pad_up--;
- if ($pad_up > 0) $out -= pow($base, $pad_up);
- }
- $out = sprintf('%F', $out);
- $out = substr($out, 0, strpos($out, '.'));
- }
- else
- {
- // Digital number -->> alphabet letter code
- if (is_numeric($pad_up)) {
- $pad_up--;
- if ($pad_up > 0) $in += pow($base, $pad_up);
- }
-
- $out = "";
- for ($t = floor(log($in, $base)); $t >= 0; $t--) {
- $bcp = bcpow($base, $t);
- $a = floor($in / $bcp) % $base;
- $out = $out . substr($index, $a, 1);
- $in = $in - ($a * $bcp);
- }
- $out = strrev($out); // reverse
- }
-
- return $out;
- }
- ?>
关联页面 shorturls.php
-
原理: 将提交的网址存放数组里面,同时为之产生一个唯一的键,之后将该数组存放文本中,当然你也可以存放到数据库中,此实例为存放到文本中。
有关的函数
1. array_search() 函数
array_search(value,array,strict)
array_search() 函数与 in_array() 一样,在数组中查找一个键值。如果找到了该值,匹配元素的键名会被返回。如果没找到,则返回 false。
2. var_export() 函数
此函数返回关于传递给该函数的变量的结构信息,它和 var_dump() 类似,不同的是其返回的表示是合法的 PHP 代码。
您可以通过将函数的第二个参数设置为 TRUE,从而返回变量的表示。
比较 var_export() 和 var_dump().
最后是 接受页面 redirect.php
- include 'shorturls.php';
- $uid = $_GET['uid'];
- $addr = ($uid AND array_key_exists($uid,$shortUrls)) ? $shortUrls[$uid]: '/';
- header('location:'.$addr);
- ?>
此页面需要结合 .htaccess or .waccess 使用:
- RewriteEngine On
- RewriteRule ^s=(.*)$ /redirect.php?uid=$1 [R=301,L]
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