SplFileObject::fgets

(PHP 5 >= 5.1.0, PHP 7)

SplFileObject::fgets — Gets line from file

说明

public SplFileObject::fgets ( void ) : string

Gets a line from the file.

参数

此函数没有参数。

返回值

Returns a string containing the next line from the file, or FALSE on error.

错误／异常

Throws a RuntimeException if the file cannot be read.

范例

Example #1 SplFileObject::fgets() example

This example simply outputs the contents of file.txt line-by-line.


<?php
$file = new SplFileObject("file.txt");
while (!$file->eof()) {
    echo $file->fgets();
}
?>

参见

fgets() - 从文件指针中读取一行
SplFileObject::fgetss() - Gets line from file and strip HTML tags
SplFileObject::fgetc() - Gets character from file
SplFileObject::current() - Retrieve current line of file

User Contributed Notes

Chris Johnson 22-Jan-2018 09:45


Note that this method will cause a PHP fatal error if the file being read contains no recognizable line termination characters and is larger than the allowable memory size for PHP to allocate, i.e. memory_limit set in php.ini or similar.  In other words, PHP keeps reading until it finds a line termination, if it runs out of memory first, it will throw a fatal error.



This is different from the file resource fread() function, which allows an optional maximum length argument to be passed to limit this behavior.