Definition and Usage
定义和用法

The fpassthru() function reads all data from the current position in an open file, until EOF, and writes the result to the output buffer.
fpassthru()函数的作用是：读取一个文件从当前位置开始的所有数据，直到EOF，并把结果写进输出缓冲器[output buffer]里。

This function returns the number of characters passed or FALSE on failure.
这个函数返回了传递的字符数量；如果执行失败将返回False。

Syntax
语法

fpassthru(file)

Tips and Notes
提示和注意点

Note: When using fpassthru() on a binary file on Windows, remember to open the file in binary mode.
注意：当在Windows的二进制文件中使用fpassthru()函数时，请牢记，必须以二进制的模式打开文件。

Tip: Call rewind() to set the file pointer to the beginning of the file if you have already written to the file.
提示：如果你已将内容写进文件，那么你可以使用rewind()函数将文件指针设置在文件的开头。

Tip: If you just want to dump the contents of a file to the output buffer, without first modifying it, use the readfile() function instead.
提示：如果你想将文件的内容输出到输出缓冲器[out buffer]，而对它进行修改，那么，你可以使用readfile()函数代替fpassthru()函数。

Example 1
案例1

<?php
$file = fopen("test.txt","r");

// Read first line
fgets($file);

// Send rest of the file to the output buffer
echo fpassthru($file);

fclose($file);
?> 

The output of the code above could be:
上述代码将输出下面的结果：

There are three lines in this file.
This is the last line.59

59 indicates the number of characters passed.
数字“59”表示总共传递的字符数量

Example 2
案例2

Dump index page of a www server:
清除www服务器的索引页：

<?php
$file = fopen("http://www.example.com","r");
fpassthru($file);
?>

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