don't overwrite a line

robertaccettura

I have a script that saves it's certain settings, and such to a file periodically. I want to use this function that I wrote, but it doesn't work right.

The theory is as follows:

Each line is an entry

In the format of:
$config=yes/no;
or
$config="this is a string"

Should update a line if it finds $config somewhere in the file...

If it doesn't, it should write a new line on the bottom.

        $writeval = "";
		$filename = "$this->configfile";
        $fp = fopen($filename, "r");
        $maildatabase = fread($fp, filesize($filename));
        fclose($fp);
        $line = explode("\n", $maildatabase);
        while ($i <= sizeof($line)) {
            $data_pair = explode("=", $line[$i]);
            if ($config == $data_pair[0]) {
				if ($type == "string") {
					print "a";
					$writeval .= "$config=\"$value\"\n";                

                } else {
					print "b";
					$writeval .= "$config=$value;\n";
				}

        } else {
            	print "c....$line[$i],...";
				$writeval .= $line[$i];
		} 
       $i++;
	}

Problem is it always overwrites the file. Any ideas why? How can I get this working? It's driving me nuts.

robertaccettura

Anyone?

diego25

I don't understand your problem. You'll always have to overwrite the file -- there's no way to edit just one line of the file.

Diego

robertaccettura

I know that.

But I need to preserve what's there....

So my plan was to read, then write the new information, and copy back what is unchanged... that's what the script should do, but doesn't.

diego25

What does it currently do?

Diego

robertaccettura

right now, it only writes the line created.

It should take

$config and $value, check to see if $config already exists, overwrite the line if it exists, then write the rest of the file back.

Right now, it only writes the one line, not the rest of the file as it should.

diego25

You're not initializing any of the variables that you're using. i.e. $i and $writeval.
When you do $writeval .= $line[$i], you need to add a newline character at the end.

Diego