PHP filter string function example

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Release: 2016-07-25 08:53:35
Original
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  1. class request

  2. {
  3. public function __construct()
  4. {
  5. if(!get_magic_quotes_gpc())
  6. {
  7. if(!empty($_POST))
  8. {
  9. foreach ($_POST as $k => &$v)
  10. {
  11. if(is_array($v))
  12. {
  13. @array_walk($v, 'urldecode');
  14. @array_walk($v, 'addslashes');
  15. }
  16. else
  17. {
  18. $v = addslashes(urldecode($v));
  19. }
  20. $p[$k] = $v;
  21. }
  22. $_POST = $p;
  23. unset($p);
  24. }
  25. if(!empty($_GET))
  26. {
  27. foreach ($_GET as $k => &$v)
  28. {
  29. if(is_array($v))
  30. {
  31. @array_walk($v, 'urldecode');
  32. @array_walk($v, 'addslashes');
  33. }
  34. else
  35. {
  36. $v = addslashes(urldecode($v));
  37. }
  38. $g[$k] = $v;
  39. }
  40. $_GET = $g;
  41. unset($g);
  42. }
  43. }
  44. }
  45. public static function getQuery( $key )
  46. {
  47. if( isset( $_GET[$key]) )
  48. {
  49. return self::xss_clean($_GET[$key]);
  50. }
  51. else
  52. {
  53. return false;
  54. }
  55. }
  56. public static function getPost( $key )
  57. {
  58. if( isset( $_POST[$key]) )
  59. {
  60. return self::xss_clean($_POST[$key]);
  61. }
  62. else
  63. {
  64. return false;
  65. }
  66. }
  67. public static function getServer($key)
  68. {
  69. $key = strtoupper($key);
  70. if(isset($_SERVER[$key]))
  71. {
  72. return self::xss_clean($_SERVER[$key]);
  73. }
  74. return false;
  75. }
  76. public static function getSession( $key )
  77. {
  78. if( isset( $_SESSION[$key]) )
  79. {
  80. return self::xss_clean($_SESSION[$key]);
  81. }
  82. else
  83. {
  84. return false;
  85. }
  86. }
  87. public static function getCookie( $key )
  88. {
  89. if( isset( $_COOKIE[$key]) )
  90. {
  91. return $_COOKIE[$key];
  92. }
  93. else
  94. {
  95. return false;
  96. }
  97. }
  98. /**
  99. * Filter illegal characters (distribution)
  100. */
  101. private static function xss_clean($str) {
  102. if (is_array($str) && !empty($str)) {
  103. $str = self::xss_clean_arr($str);
  104. } else {
  105. $str = self::xss_clean_str($str);
  106. }
  107. return $str;
  108. }

  109. /**

  110. * Filter illegal characters (array)
  111. */
  112. private static function xss_clean_arr($str) {
  113. foreach ($str as $key => $val) {
  114. if (is_array($val)) {
  115. $val = self::xss_clean_arr($val);
  116. } else {
  117. $val = self::xss_clean_str($val);
  118. }
  119. $arr[$key] = $val;
  120. }
  121. return $arr;
  122. }

  123. /**

  124. * Filter illegal characters (string)
  125. */
  126. private static function xss_clean_str($str) {
  127. $str = preg_replace('#(alert|cmd|passthru|eval|exec|expression|system|fopen|fsockopen|file|file_get_contents|readfile|unlink)(s*)((.*?))#si', "\1\2(\3)", $str);
  128. if (get_magic_quotes_gpc()) {
  129. return $str;
  130. } else {
  131. return addslashes($str);
  132. }
  133. }
  134. }

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