PHP check if script is already running:
In PHP, you can check if a script is already running using file locks or process control functions. Here’s an explanation of each method with examples:
Method 1: File Locks
This method involves creating and acquiring a lock on a file, which prevents other instances of the script from obtaining the lock until it is released.
Example:
Method 2: Process Control Functions
This method involves using the process control functions provided by PHP, such as `exec()` and `shell_exec()`, to check if the script is already running by searching for its own process in the process list.
Example:
1) {
// The script is already running
// Handle the situation accordingly, e.g., show an error message or exit
echo 'Script is already running.';
exit;
}
// Script is not running, proceed with the code execution
?>
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