SplFileObject::key()
(PHP 5 >= 5.1.0, PHP 7)
Get line number
说明
public SplFileObject::key(void): int
Gets the current line number.
Note:This number may not reflect the actual line number in the file if SplFileObject::setMaxLineLen() is used to read fixed lengths of the file.
参数
此函数没有参数。
返回值
Returns the current line number.
范例
SplFileObject::key() example
<?php $file = new SplFileObject("lipsum.txt"); foreach ($file as $line) { echo $file->key() . ". " . $line; } ?>
以上例程的输出类似于:
0. Lorem ipsum dolor sit amet, consectetur adipiscing elit. 1. Duis nec sapien felis, ac sodales nisl. 2. Lorem ipsum dolor sit amet, consectetur adipiscing elit.
SplFileObject::key() example with SplFileObject::setMaxLineLen()
<?php $file = new SplFileObject("lipsum.txt"); $file->setMaxLineLen(20); foreach ($file as $line) { echo $file->key() . ". " . $line . "\n"; } ?>
以上例程的输出类似于:
0. Lorem ipsum dolor s 1. it amet, consectetu 2. r adipiscing elit. 3. 4. Duis nec sapien fel 5. is, ac sodales nisl 6. . 7. Lorem ipsum dolor s 8. it amet, consectetu 9. r adipiscing elit.
参见
- SplFileObject::current() Retrieve current line of file
- SplFileObject::seek() Seek to specified line
- SplFileObject::next() Read next line
- SplFileObject::rewind() Rewind the file to the first line
- SplFileObject::valid() Not at EOF