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                            # Coroutine::fread
協程方式讀取文件。

`function Coroutine::fread(resource $handle, int $length = 0);`

>需要2.0.11或更高版本

## 參數
* $handle文件句柄，必須是fopen打開的文件類型stream資源
* $length讀取的長度，默認為0，表示讀取文件的全部內容
## 返回值
* 讀取成功返回字符串內容，讀取失敗返回false

## 示例
```
use Swoole\Coroutine as co;
$fp = fopen(__DIR__ . "/defer_client.php", "r");
co::create(function () use ($fp)
{
    fseek($fp, 256);
    $r =  co::fread($fp);
    var_dump($r);
});
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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