What potential issues can arise when multiple users upload images simultaneously in a PHP-based auction system?

Potential issue: When multiple users upload images simultaneously in a PHP-based auction system, there may be conflicts with file naming, overwriting of files, or performance issues due to concurrent file operations. To solve this, you can generate unique file names for each uploaded image to prevent conflicts and ensure that each image is saved correctly. 

// Generate a unique file name for the uploaded image
$unique_filename = uniqid() . '_' . $_FILES['image']['name'];

// Move the uploaded image to the desired directory with the unique file name
move_uploaded_file($_FILES['image']['tmp_name'], 'uploads/' . $unique_filename);

// Save the unique file name in the database for reference
$image_path = 'uploads/' . $unique_filename;
// Insert $image_path into the database or use it as needed

Keywords

concurrency file locking race condition database transactions image processing

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