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                            [TOC]

## 格式
```
flock ( resource $handle , int $operation , int &$wouldblock = ? ) : bool

operation 可以是以下值之一：

    LOCK_SH取得共享鎖定（讀取的程序）。
    LOCK_EX 取得獨占鎖定（寫入的程序。
    LOCK_UN 釋放鎖定（無論共享或獨占）
```


## 實例
```
$file = fopen("test.txt","w+");
if (flock($file,LOCK_EX)){
    fwrite($file,"Write something");
    flock($file,LOCK_UN);
}else{
    echo "Error locking file!";
}
 
fclose($file);

```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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