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How to create a short address (var_export) in php

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Release： 2016-07-25 09:04:28
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处理页面 show.php：

  2. include 'functions.php';
  3. include 'shorturls.php';
  5. $entry = $_POST['submit'];
  6. $url = $_POST['url'];
  7. $output = '';
  9. if($entry == 'Shorten Url' AND $url)
  10. {
  11. if(!in_array($url,$shortUrls))
  12. {
  13. $uif = alphaID(count($shortUrls),false,6);
  15. if(!array_key_exists($uif,$shortUrls))
  16. {
  17. $shortUrls[$uif] = $url;
  19. $file = fopen('shorturls.php','w');
  20. fwrite($file,'');
  21. fclose($file);
  22. $output = 'Original Url : '.$url.'
    Shorten Ulr : http://www.yourdomain.com/api/s='.$uif.'';
  23. }
  24. else $output = 'access error';
  25. }
  26. else
  27. {
  28. $uif = array_search($url,$shortUrls);
  29. $output = 'Original Url : '.$url.'
    Shorten Ulr : http://www.yourdomain.com/api/s='.$uif.'';
  30. }
  32. echo $output.'

    Back';
  33. }
  34. ?>
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关联页面 functions.php

  2. function alphaID($in, $to_num = false, $pad_up = false, $passKey = null)
  3. {
  4. $index = "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
  5. if ($passKey !== null) {
  6. // Although this function's purpose is to just make the
  7. // ID short - and not so much secure,
  8. // with this patch by Simon Franz (http://blog.snaky.org/)
  9. // you can optionally supply a password to make it harder
  10. // to calculate the corresponding numeric ID
  12. for ($n = 0; $n
  13. $passhash = hash('sha256',$passKey);
  14. $passhash = (strlen($passhash) < strlen($index))
  15. ? hash('sha512',$passKey)
  16. : $passhash;
  18. for ($n=0; $n < strlen($index); $n++) $p[] = substr($passhash, $n ,1);
  20. array_multisort($p, SORT_DESC, $i);
  21. $index = implode($i);
  22. }
  24. $base = strlen($index);
  26. if ($to_num) {
  27. // Digital number <<-- alphabet letter code
  28. $in = strrev($in);
  29. $out = 0;
  30. $len = strlen($in) - 1;
  31. for ($t = 0; $t <= $len; $t++) {
  32. $bcpow = bcpow($base, $len - $t);
  33. $out = $out + strpos($index, substr($in, $t, 1)) * $bcpow;
  34. }
  36. if (is_numeric($pad_up)) {
  37. $pad_up--;
  38. if ($pad_up > 0) $out -= pow($base, $pad_up);
  39. }
  40. $out = sprintf('%F', $out);
  41. $out = substr($out, 0, strpos($out, '.'));
  42. }
  43. else
  44. {
  45. // Digital number -->> alphabet letter code
  46. if (is_numeric($pad_up)) {
  47. $pad_up--;
  48. if ($pad_up > 0) $in += pow($base, $pad_up);
  49. }
  51. $out = "";
  52. for ($t = floor(log($in, $base)); $t >= 0; $t--) {
  53. $bcp = bcpow($base, $t);
  54. $a = floor($in / $bcp) % $base;
  55. $out = $out . substr($index, $a, 1);
  56. $in = $in - ($a * $bcp);
  57. }
  58. $out = strrev($out); // reverse
  59. }
  61. return $out;
  62. }
  63. ?>
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关联页面 shorturls.php

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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

  2. include 'shorturls.php';
  3. $uid = $_GET['uid'];
  4. $addr = ($uid AND array_key_exists($uid,$shortUrls)) ? $shortUrls[$uid]: '/';
  5. header('location:'.$addr);
  6. ?>
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此页面需要结合 .htaccess or .waccess 使用：

  2. RewriteEngine On
  3. RewriteRule ^s=(.*)$ /redirect.php?uid=$1 [R=301,L]
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Related labels：
php 创建短地址 (var_export)的方法
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