How can PHP scripts be designed to allow for simultaneous or sequential execution multiple times without conflicts?

When designing PHP scripts to allow for simultaneous or sequential execution multiple times without conflicts, you can use locking mechanisms such as file locks or database locks to ensure that only one instance of the script is running at a time. This prevents conflicts that may arise from concurrent executions. 

$lockFile = fopen("lockfile.lock", "w");
if (flock($lockFile, LOCK_EX)) {
    // Critical section of the script where conflicts may occur
    // Perform necessary operations here
    
    flock($lockFile, LOCK_UN);
} else {
    echo "Could not obtain lock, script is already running.";
}

fclose($lockFile);

Keywords

concurrent execution sequential execution PHP scripts conflicts synchronization

Related Questions