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Find the relative paths of two directories

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Release： 2016-07-25 08:48:34
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Find the relative paths of two directories without limiting the path depth
  1. /**
  3. * Output the relative path of $b relative to $a ($a)
  5. * No limit on path depth, no optimization, just implementation of the function
  7. */
  9. function getPath($a, $b)
  11. {
  13. $aArr = explode('/', dirname($a));
  15. $bArr = explode ('/', dirname($b));
  19. $aLen = count($aArr);
  21. $bLen = count($bArr);
  25. $len = max($aLen, $bLen );
  29. $k = 0;
  33. for($i = 0; $i < $len; $i++)
  35. {
  37. if($k == 0)
  39. {
  41. if(isset($aArr[$i]) && ($aArr[$i] != $bArr[$i]))
  43. {
  45. $d .= '../';
  49. if( isset($bArr[$i]))
  51. {
  53. $nP[$i] = $bArr[$i];
  55. }
  59. $k = $k + 1;
  61. }
  63. }
  65. else
  67. {
  69. if(isset($aArr[$i]))
  71. {
  73. $d .= '../';
  75. }
  77. if(isset($bArr[$i] ))
  79. {
  81. $nP[$i] = $bArr[$i];
  83. }
  85. }
  87. }
  91. echo $d.implode('/', $nP);
  93. }
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求两个目录的相对路径
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