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php過濾特殊字符,僅保留中文、字母、數字、下劃線的函數
```
function match_chinese($chars,$encoding='utf8')
{
    $pattern = ($encoding=='utf8')?'/[\x{4e00}-\x{9fa5}a-zA-Z0-9_]/u':'/[\x80-\xFF]/';
    preg_match_all($pattern,$chars,$result);
    $temp = join('',$result[0]);
    return $temp;
}

//使用方法
$nickname='qipa250.com';
$nickname = match_chinese($nickname);

```

php如何用正則表達式匹配中文

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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