How can access control be implemented in a PHP script to restrict certain users from deleting or modifying files uploaded by others?

To implement access control in a PHP script to restrict certain users from deleting or modifying files uploaded by others, you can first assign unique identifiers to each file uploaded and store this information in a database along with the user who uploaded it. Then, when a user attempts to delete or modify a file, you can check if they have the necessary permissions by verifying their user ID against the user ID associated with the file in the database. 

// Check if the current user has permission to delete or modify the file
function checkFilePermission($fileId, $userId) {
    // Query the database to get the user ID associated with the file
    // Compare the retrieved user ID with the current user's ID
    // Return true if the user has permission, false otherwise
}

// Example usage
$fileId = 123;
$userId = 456;

if(checkFilePermission($fileId, $userId)) {
    // Allow the user to delete or modify the file
    // Your delete or modify file logic here
} else {
    // Display an error message or redirect the user to a different page
    echo "You do not have permission to delete or modify this file.";
}

Keywords

PHP access control file manipulation user permissions file upload

Related Questions