Removing a Line

ashtar

Hello.

I did a search and found some similar solutions to my problem, but none that would do what I need.

I have written a script that writes FORM data to a file. Each time the Form is submitted, a new line is created. What I want to do, is after a line is created, give the user the ability to delete that exact same line.

I am going to use this as sort of a "Who's Online" type thing. When someone logs in to the game, they click a button which writes their username to a file. Then when they are done with the game, they click another button and it deletes their username from the file. Writing the data has been no problem, but I cannot figure out how to find a specific line and deleting that line.

Any help would be nice. Below is what I am using to write the file if it helps. Ad the Form is just a simple POST form that POST's to this script(saveResults.php).

Thanks,
Brandon


<?
//Open the results.txt file where you want to write this information
$myFile = fopen("82nd.dat", "a");

//If it can't be opened quit
if (!($myFile)) {
print("file could not be opened");
exit;
}

//Build the string we want to write to the file
$str = "$handle\n";

//Write the string to the file
fputs($myFile, $str);

//Close the file
fclose($myFile);
?>

tekky

to delete....

$file = file_get_contents($filename); //get file contents as ONE long string variable
$file = str_replace($str,'',$file); //remove the line you want ($str) from the file)
$fh = fopen($filename,'w'); //open file
fwrite($fh, $file); //write new contents to file, deleting old contents
flcose($fh); //close file

of course you will need to add error checking....

webdes03

Your other option would be to register each session with your database, then read that database to see who's online. When the user logs off, delete that session from the database. Probably equal in difficulty, thats how I'd do it, but if you don't have access to a database that would explain why you're writing to a file.

ashtar

My site is running phpbb and I do have access to a database. The problem with that is, I do not want to use the same login status that the site it's self uses since most users set the cookie to remember them. Most do not use the Log Out feature, so their IN GAME status would not be removed. I guess I could create a new table for this, but I am not real familliar with the working of a database. I think for now, I would rather just use a file and figure out the database side of it later. Also, keep in mind I don't know a whole lot about writing PHP either. I have looked at the suggestions given so far and will see what I can figure out.

Thanks,
Brandon