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php怎么读取文件内容

May 28, 2016 am 11:50 AM
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php怎么读取文件内容

php中读取文件内容的方法

fread

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string fread ( int $handle , int $length )

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  fread() 从 handle 指向的文件中读取最多 length 个字节。该函数在读取完最多 length 个字节数,或到达 EOF 的时候,或(对于网络流)当一个包可用时,或(在打开用户空间流之后)已读取了 8192 个字节时就会停止读取文件,视乎先碰到哪种情况。

  fread() 返回所读取的字符串,如果出错返回 FALSE。

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<?php

    $filename = "/usr/local/something.txt";

    $handle = fopen($filename, "r");//读取二进制文件时,需要将第二个参数设置成&#39;rb&#39;

     

    //通过filesize获得文件大小,将整个文件一下子读到一个字符串中

    $contents = fread($handle, filesize ($filename));

    fclose($handle);

?>

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  如果所要读取的文件不是本地普通文件,而是远程文件或者流文件,就不能用这种方法,因为,filesize不能获得这些文件的大小。此时,你需要通过feof()或者fread()的返回值判断是否已经读取到了文件的末尾。

  例如:

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<?php

    $handle = fopen(&#39;http://www.baidu.com&#39;, &#39;r&#39;);

    $content = &#39;&#39;;

    while(!feof($handle)){

        $content .= fread($handle, 8080);

    }

    echo $content;

    fclose($handle);

?>

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或者:

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<?php

    $handle = fopen(&#39;http://www.baidu.com&#39;, &#39;r&#39;);

    $content = &#39;&#39;;

    while(false != ($a = fread($handle, 8080))){//返回false表示已经读取到文件末尾

        $content .= $a;

    }

    echo $content;

    fclose($handle);

?>

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