Originally Posted by lordspace

One solution could be:

create a temp file called lock.txt.
The file will be created only after a successful login. The file will be deleted after logout.
Before login you check if the file exists and if it does the script stops.

Note:
if for some reason the temp file cannot be deleted. It is a good idea before login to check for last modification time if it is more than 24hours delete the file.

Originally Posted by lordspace

One solution could be:

create a temp file called lock.txt.
The file will be created only after a successful login. The file will be deleted after logout.
Before login you check if the file exists and if it does the script stops.

Note:
if for some reason the temp file cannot be deleted. It is a good idea before login to check for last modification time if it is more than 24hours delete the file.

Originally Posted by ryan_vietnow

use file_exists function

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php Syntax (Toggle Plain Text)

 
$filename = '/path/to/foo.txt';
 
if (file_exists($filename)) {
    echo "The file $filename exists";
} else {
    echo "The file $filename does not exist";
}

$filename = '/path/to/foo.txt'; if (file_exists($filename)) { echo "The file $filename exists"; } else { echo "The file $filename does not exist"; }