Detailed explanation of word filtering principle in ucenter

This article mainly introduces the principle of word filtering in ucenter, and analyzes the related SQL field definitions and filtering functions of words in ucenter in the form of examples. It involves PHP regular replacement and related operation skills of strings and arrays. Friends in need You can refer to it. I hope to be helpful.

This article analyzes the word filtering principle in ucenter. Share it with everyone for your reference, the details are as follows:

Filter word list:

##1UCenterAdministAccess大/visit/is2UCenterAdminist465545/4655/is##34

id	admin	find	replacement	findpattern
UCenterAdminist	fdsaf	dfsa	/fdsaf /is
UCenterAdminist	有chances	at	/有chances/is

Building cache data:

//private
function _get_badwords() {
  $data = $this->db->fetch_all("SELECT * FROM ".UC_DBTABLEPRE."badwords");
  $return = array();
  if(is_array($data)) {
    foreach($data as $k => $v) {
      $return['findpattern'][$k] = $v['findpattern'];
      $return['replace'][$k] = $v['replacement'];
    }
  }
  return $return;
}

Calling method:

$_CACHE['badwords'] = $this->base->cache('badwords');
if($_CACHE['badwords']['findpattern']) {
  $subject = @preg_replace($_CACHE['badwords']['findpattern'], $_CACHE['badwords']['replace'], $subject);
  $message = @preg_replace($_CACHE['badwords']['findpattern'], $_CACHE['badwords']['replace'], $message);
}

preg_replace() Each parameter (except limit) can be an array. If both pattern and replacement are arrays, their keys will be processed in the order in which they appear in the array. This is not necessarily the same as the numerical order of the index. If an index is used to identify which pattern is to be replaced by which replacement, the array should be sorted with ksort() before calling preg_replace().

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