A sleek way of counting the number of lines in a file can be like below
$file = new \SplFileObject('file.extension', 'r');
$file->seek(PHP_INT_MAX);
echo $file->key() + 1;
SplFileObject::seek
(PHP 5 >= 5.1.0, PHP 7, PHP 8)
SplFileObject::seek — Seek to specified line
说明
public SplFileObject::seek(int
$line_pos): voidSeek 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
示例 #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
add a note
User Contributed Notes 1 note
ahmad_maqsood at waku-2 dot com ¶
6 years ago
