Delete a Specific Line?

I have a flat file database, and I'm wondering if I could enter a line, say, on a regular form, and have a PHP script find and delete that line in the flat file?

Anyone know if this is possible?

Thanks,
Peter

 

function delete_line($line, $file)
{
	if (!$lines = @file($file))
	{
		trigger_error("File <i>{$file}</i> does not exists or can't be opened");	
		return false;
	}

	unset($lines[$line]);
	
	$fp = fopen($file, 'w');
	fwrite($fp, implode("\n", array_map('trim', $lines)));
	fclose($fp);
	
	return true;
}

PHP:

Usage:

if (delete_line(5, 'test.txt'))
{
	echo 'Line deleted';
}
else
{
	echo 'Line not deleted';
}

?>

PHP:

Note that the first line starts with 0, and not 1.

 

Wow, thanks a lot!

I take it you don't mind if I use that code verbatim? (Just in case.)

 

It's all yours. You can keep, sell, or eat it.

 

I've set it up with a form, and added some simple validation.

Also added redirects for successful or unsuccessful attempts.

Thanks again!