Definition and Usage
定义和用法

The fgets() function returns a line from an open file.
fgets()函数的作用是：从文件指针中读取一行。

The fgets() function stops returning on a new line, at the specified length, or at EOF, whichever comes first.
fgetcsv()函数可以对是否输出新的一行词段作出设置，具体见下面的语法；当到达文档段落末尾[EOF]时，该函数将停止运行。

This function returns FALSE on failure.
如果运行失败，函数将返回False。

Syntax
语法

fgets(file,length)

Example 1
案例1

<?php

$file = fopen("test.txt","r");
echo fgets($file);
fclose($file);

?> 

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

Hello, this is a test file.

Example 2
案例2

Read file line by line:
逐行读取文件：

<?php

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

while(! feof($file)) { echo fgets($file). "<br />"; }

fclose($file);
?>

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

Hello, this is a test file.
There are three lines here.
This is the last line.

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