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php feof 函数

Jun 13, 2016 am 11:17 AM
phpunderfunctionaccomplishTutorialdocumentyeshavetestofFinish

下面是一个专门讲述feof 教程,有实现等。  

下面是一个专门讲述feof 教程,有实现等。

feof
( PHP 4中, PHP 5中)

feof -测试文件结束的文件指针

描述
布尔feof (资源$处理)
试验结束时的档案文件指针。

参数

把柄
文件指针必须有效,必须指向一个文件成功打开fopen ( )或者fsockopen ( ) (和尚未关闭fclose ( ) ) 。


返回值
返回TRUE ,如果文件指针是EOF分析或发生错误(包括套接字超时) ,否则返回FALSE 。


警告
如果一个连接开幕fsockopen ( )不关闭服务器, feof ( )将等到超时已达到返回值TRUE 。默认的超时值为60秒。您可以使用stream_set_timeout ( )来改变这个值。

警告
如果通过文件指针是无效的,您会得到一个无限循环,因为feof ( )没有返回值TRUE 。

看看实例:

// if file can not be read or doesn't exist fopen function returns FALSE
$file = @fopen("no_such_file", "r");

// FALSE from fopen will issue warning and result in infinite loop here
while (!feof($file)) {
}

fclose($file);
?>


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