SplFileObject::fgets()

(PHP 5 >= 5.1.0, PHP 7)

Gets line from file

说明

publicSplFileObject::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

SplFileObject::fgets() example

This example simply outputs the contents offile.txtline-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

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.