SplFileObject::key
(PHP 5 >= 5.1.0, PHP 7, PHP 8)
SplFileObject::key — Get line number
Description
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.
Parameters
This function has no parameters.
Return Values
Returns the current line number.
Examples
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.
See Also
- 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
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