Weight calculation, a little modification can also be used for word segmentation, frequency statistics, full text and spam detection, etc.

Source: Internet
Author: User
The efficiency is very objective, if you change to other uses that efficiency I don't promise.
  1. /* Vim:set expandtab tabstop=4 shiftwidth=4: */
  2. // +------------------------------------------------------------------------
  3. Name: Weight Calculation
  4. Description: Slightly modified, can also be used for word segmentation, frequency statistics, full-text search and garbage detection
  5. DATE:2013/12/16 08:51
  6. Authors:latel
  7. // +------------------------------------------------------------------------
  8. //
  9. /* External Invocation example */
  10. /*
  11. $aItems = Array (
  12. ' Chinaisbig ',
  13. ' Whichisnot ',
  14. ' Totalyrightforme ',
  15. );
  16. $aTable = Array (
  17. ' China,is|small ',
  18. ' China,big|me ',
  19. ' China,is|big,which|not,me ',
  20. ' Totaly|right,for,me ',
  21. );
  22. $oWeight = new Ttrie;
  23. $oWeight->newitems ($aItems);
  24. $aResult = $oWeight->newtable ($aTable);
  25. */
  26. Class Weight {
  27. Protected $aDict = Array (array ());
  28. Protected $aItems = Array ();
  29. protected $sLastRule;
  30. Protected $aMatchs = Array ();
  31. Protected $aShow = Array ();
  32. Private Function init () {
  33. Clears the record's match table and output results
  34. unset ($this->ashow);
  35. }
  36. Public Function NewItems ($mItems) {
  37. Import a new project
  38. $this->aitems = (Is_array ($mItems))? $mItems: Array ($mItems);
  39. $this->init ();
  40. }
  41. Public Function newtable (array $aTable) {
  42. Import a new table and generate a dictionary
  43. foreach ($aTable as $iTableKey = = $sTableLine) {
  44. $aTableLine = Explode (', ', Str_replace (' | ', ', ', $sTableLine));
  45. $setter = function ($v, $k, $paraMeter) {
  46. $k 1 = $paraMeter [0]; $oWeight = $paraMeter [1];
  47. $oWeight->gendict ($v, $k 1);
  48. };
  49. Array_walk ($aTableLine, $setter, Array ($iTableKey, $this));
  50. }
  51. $this->init ();
  52. }
  53. Public Function getshow ($sRule = ' Max ') {
  54. Get the final display result
  55. if (Empty ($this->aitems) | | empty ($this->adict))
  56. return Array ();
  57. if (Empty ($this->ashow) | | $sRule! = $this->slastrule)
  58. return $this->genshow ($sRule);
  59. return $this->ashow;
  60. }
  61. Public Function Genshow ($sRule) {
  62. $aShow = Array ();
  63. $aMatchs = Array ();
  64. $getter = function ($v, $k, $oWeight) use (& $aShow, & $aMatchs, $sRule) {
  65. $t = Array_count_values ($oWeight->matchword ($v));
  66. $aMatchs [] = $t;
  67. Switch ($sRule) {
  68. Case ' Max ':
  69. $aShow [$k] = Array_keys ($t, Max ($t));
  70. Break
  71. }
  72. };
  73. Array_walk ($this->aitems, $getter, $this);
  74. $this->ashow = $aShow;
  75. $this->amatchs = $aMatchs;
  76. return $aShow;
  77. }
  78. Private Function Gendict ($mWord, $iKey = ") {
  79. $iInsertPonit = count ($this->adict);
  80. $iCur = 0; Current node number
  81. foreach (Str_split ($mWord) as $iChar) {
  82. if (Isset ($this->adict[$iCur [$iChar])) {
  83. $iCur = $this->adict[$iCur] [$iChar];
  84. Continue
  85. }
  86. $this->adict[$iInsertPonit] = array ();
  87. $this->adict[$iCur] [$iChar] = $iInsertPonit;
  88. $iCur = $iInsertPonit;
  89. $iInsertPonit + +;
  90. }
  91. $this->adict[$iCur [' ACC '] [] = $iKey;
  92. }
  93. function Matchword ($sLine) {
  94. $iCur = $iOffset = $iPosition = 0;
  95. $sLine. = "n";
  96. $iLen = strlen ($sLine);
  97. $aReturn = Array ();
  98. while ($iOffset < $iLen) {
  99. $sChar = $sLine {$iOffset};
  100. if (Isset ($this->adict[$iCur [$sChar])) {
  101. $iCur = $this->adict[$iCur] [$sChar];
  102. if (Isset ($this->adict[$iCur [' ACC '])) {
  103. $aReturn = Array_merge ($aReturn, $this->adict[$iCur [' acc ']);
  104. $iPosition = $iOffset + 1;
  105. $iCur = 0;
  106. }
  107. } else {
  108. $iCur = 0;
  109. $iOffset = $iPosition;
  110. $iPosition = $iOffset + 1;
  111. }
  112. + + $iOffset;
  113. }
  114. return $aReturn;
  115. }
  116. }
  117. ?>
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