php关键字过滤类

1. <?php
2. class fillter{
3. private $keyword_file;
4. private $dict;
5. public $result;
6. public function __construct($file){
7. if(!is_file($file)){
8. trigger_error("$file not exists!");
9. }
10. $this->keyword_file=$file;
11. }
12. public function fill($resource){
13. $this->dict = $this->getDict();
14. $len = strlen($resource);
15. for($i=0; $i<$len; ++$i){
16. $key=substr($resource,$i,2);
17. if(array_key_exists($key,$this->dict)){
18. $this->deal(substr($resource,$i,$this->dict[$key]['max']),$key,$af);
19. $i+=$af;
20. }
21. else{
22. $this->result .=substr($resource,$i,1);
23. }
24. }
25. return $this->result;
26. }
27. public function deal($res,$key,&$af){
28. $af=0;
29. foreach($this->dict[$key]['list'] as $keyword){
30. if(strpos($res,$keyword) !==false){
31. $len=strlen($keyword);
32. $af=$len-1;
33. $this->result .=str_repeat("*",$len);
34. return;
35. }
36. }
37. $this->result .= substr($res,0,1);
38. }
39. private function getKeyWordList(){
40. $keywords = file_get_contents($this->keyword_file);
41. return array_unique(explode("\r\n",$keywords));
42. }
43. public function getDict(){
44. $keywords=$this->getKeyWordList();
45. $dict=array();
46. foreach($keywords as $keyword){
47. if(empty($keyword)){
48. continue;
49. }
50. $key = substr($keyword,0,2);
51. $dict[$key]['list'][]=$keyword;
52. $dict[$key]['max']=max($dict[$key]['max'],strlen($keyword));
53. }
54. return $dict;
55. }
56. }
57. //测试用demo 结果比直接用正则提高了３倍效率
58. $res = $text = file_get_contents("test.txt");
59. $t1 = microtime(true);
60. $fil = new fillter("banwords.txt");
61. $res = $fil->fill($text);
62. //$res = $fil->getDict();
63. //$keywords = explode("\r\n",file_get_contents("banwords.txt"));
64. //foreach($keywords as $keyword){
65. // if(empty($keyword)){
66. // continue;
67. // }
68. // $res = preg_replace("/$keyword/","***",$res);
69. //}
70. $t2 = microtime(true);
71. echo $t2-$t1;
72. echo $text,"<br/>";
73. echo "<pre>";
74. print_r( $res);
75. echo "</pre>";
76. ?>

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