reading a file and deleting a line.

Anon

i have a file under data/auth.db, and i want to search the file for a user name and password, and delete the line when it finds the matching user name and password. the contents of the auth.db file is as follows:

username:password
nextuser:passwords
onmore:morepasses

i want to compare the username and the password to the submited ones and delete the line when i finds them. but i have no idea how to get started on it 🙂

amcgrath

$lines = file($that_file_u_want_to_read);

while(list(,$info) = @each($lines)) {
if ($info != $the_match_you_want) {
$new_file[] = $info;
}
}

$new_file_to_write_back = implode("\n",$new_file);

then just write $new_file over $that_file_u_want_to_read and you sohuld be good to go.

Anon

Get a database like mysql if you can. Flat files are a pain in the neck.

Open the file with fopen().
Read the contents into an array with file().
Do a line by line comparison and write back result to the file with

for($loop=0; $loop < sizeof(arrayItems-1); $loop++)
{
WHILE($arrayItems[$loop] != $userInput)
{ fputs() }
}

Close the file with fclose().

This sketch should get you started, but if you want a real peace of mind, a database is the way to go.

Richie.

geocities.com/akindele/

Anon

I agree with Richie. With MySQL, all you'd need is something like this:

mysql-> delete from TABLE where COLUMN = "$Variable";

Anon

$AuthFile = "auth.file";
$AuthFileTMP = "auth.file.tmp";

$readfilef = fopen($AuthFile,"r");
$tempfilef = fopen($AuthFileTMP,"w");

while(!feof($readfilef))
{
$line = fgets($readfilef, 100);
$newline = strpos($line, $username);

if($newline === false) {
    fputs($tempfilef, "$line\n", 1000);
}

}

fclose($readfilef);
fclose($tempfilef);

if (file_exists($AuthFileTMP)) {
copy($AuthFileTMP, $AuthFile);
}

if (file_exists($AuthFileTMP)) {
unlink($AuthFileTMP);
}