Php/docs/splfileobject.seek

• PHP Manual
• SplFileObject
• Seek to specified line

SplFileObject::seek

(PHP 5 >= 5.1.0, PHP 7)

SplFileObject::seek — Seek to specified line

说明

public SplFileObject::seek ( int $line_pos ) : void

Seek to specified line in the file.

参数

line_pos

The zero-based line number to seek to.

返回值

没有返回值。

错误／异常

Throws a LogicException if the line_pos is negative.

范例

Example #1 SplFileObject::seek() example

This example outputs the third line of the script which is found at position 2.

<?php$file = new SplFileObject(__FILE__);$file->seek(2);echo $file->current();?>

以上例程的输出类似于：

$file->seek(2);

参见

• SplFileObject::current() - Retrieve current line of file
• SplFileObject::key() - Get line number
• SplFileObject::next() - Read next line
• SplFileObject::rewind() - Rewind the file to the first line
• SplFileObject::valid() - Not at EOF