(PHP 5 >= 5.1.0, PHP 7)
SplFileObject::key — Get line number
public SplFileObject::key ( ) : 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.
This function has no parameters.
Returns the current line number.
Example #1 SplFileObject::key() example
<?php $file = new SplFileObject("lipsum.txt"); foreach ($file as $line) { echo $file->key() . ". " . $line; } ?>
The above example will output something similar to:
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.
Example #2 SplFileObject::key() example with SplFileObject::setMaxLineLen()
<?php $file = new SplFileObject("lipsum.txt"); $file->setMaxLineLen(20); foreach ($file as $line) { echo $file->key() . ". " . $line . "\n"; } ?>
The above example will output something similar to:
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.
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https://www.php.net/manual/en/splfileobject.key.php