php的敏感词过滤

谁践踏了优雅 2022-03-06 04:06 266阅读 0赞

**fiter类：**

class Fiter
    { 
        private $dict;
        private $dictPath;
     
        public function __construct($dictPath)
        { 
            $this->dict = array();
            $this->dictPath = $dictPath;
            $this->initDict();
        }
     
        private function initDict()
        { 
            $handle = fopen($this->dictPath, 'r');
            if (!$handle) { 
                throw new BadRequestHttpException('未找到敏感词过滤文件');
            }
            while (!feof($handle)) { 
                $word = trim(fgets($handle, 128));
                if (empty($word)) { 
                    continue;
                }
                $uWord = $this->unicodeSplit($word);
                $pdict = &$this->dict;
                $count = count($uWord);
                for ($i = 0; $i < $count; $i++) { 
                    if (!isset($pdict[$uWord[$i]])) { 
                        $pdict[$uWord[$i]] = array();
                    }
                    $pdict = &$pdict[$uWord[$i]];
                }
                $pdict['end'] = true;
            }
            fclose($handle);
        }
     
        public function filter($str, $maxDistance = 5)
        { 
            if ($maxDistance < 1) { 
                $maxDistance = 1;
            }
            $uStr = $this->unicodeSplit($str);
            $count = count($uStr);
            for ($i = 0; $i < $count; $i++) { 
                if (isset($this->dict[$uStr[$i]])) { 
                    $pdict = &$this->dict[$uStr[$i]];
                    $matchIndexes = array();
                    for ($j = $i + 1, $d = 0; $d < $maxDistance && $j < $count; $j++, $d++) { 
                        if (isset($pdict[$uStr[$j]])) { 
                            $matchIndexes[] = $j;
                            $pdict = &$pdict[$uStr[$j]];
                            $d = -1;
                        }
                    }
                    if (isset($pdict['end'])) { 
                       // $uStr[$i] = '*';
                        $uStr[$i] = "<font color='red'>{$uStr[$i]}</font>";
                        foreach ($matchIndexes as $k) { 
                            if ($k - $i == 1) { 
                                $i = $k;
                            }
                            //$uStr[$k] = '*';
                            $uStr[$k] = "<font color='red'>{$uStr[$i]}</font>";
                        }
                    }
                }
            }
            return implode($uStr);
        }
     
        public function unicodeSplit($str)
        { 
            $str = strtolower($str);
            $ret = array();
            $len = strlen($str);
            for ($i = 0; $i < $len; $i++) { 
                $c = ord($str[$i]);
                if ($c & 0x80) { 
                    if (($c & 0xf8) == 0xf0 && $len - $i >= 4) { 
                        if ((ord($str[$i + 1]) & 0xc0) == 0x80 && (ord($str[$i + 2]) & 0xc0) == 0x80 && (ord($str[$i + 3]) & 0xc0) == 0x80) { 
                            $uc = substr($str, $i, 4);
                            $ret[] = $uc;
                            $i += 3;
                        }
                    } else if (($c & 0xf0) == 0xe0 && $len - $i >= 3) { 
                        if ((ord($str[$i + 1]) & 0xc0) == 0x80 && (ord($str[$i + 2]) & 0xc0) == 0x80) { 
                            $uc = substr($str, $i, 3);
                            $ret[] = $uc;
                            $i += 2;
                        }
                    } else if (($c & 0xe0) == 0xc0 && $len - $i >= 2) { 
                        if ((ord($str[$i + 1]) & 0xc0) == 0x80) { 
                            $uc = substr($str, $i, 2);
                            $ret[] = $uc;
                            $i += 1;
                        }
                    }
                } else { 
                    $ret[] = $str[$i];
                }
            }
            return $ret;
        }
    }

直接调用类就可使用

例如

$fiter=new Fiter(要过滤的文件);

$fiter->filter(要过滤的字符串,0);