Are there any best practices or guidelines to follow when implementing a mass upload feature in PHP?

When implementing a mass upload feature in PHP, it is important to handle file uploads securely to prevent security vulnerabilities such as file injection attacks. One best practice is to validate file types and sizes before processing the uploads. Additionally, consider implementing a file naming convention to prevent overwriting existing files. 

// Check if files were uploaded
if(isset($_FILES['files'])){
    $file_array = restructure_files_array($_FILES['files']);
    
    // Loop through each file
    foreach($file_array as $file){
        // Validate file type and size
        if(validate_file($file)){
            // Generate a unique file name
            $file_name = generate_unique_filename($file['name']);
            
            // Move the file to the upload directory
            move_uploaded_file($file['tmp_name'], 'uploads/' . $file_name);
        }
    }
}

function restructure_files_array($files){
    $file_array = array();
    $file_count = count($files['name']);
    $file_keys = array_keys($files);
    
    for($i=0; $i<$file_count; $i++){
        foreach($file_keys as $key){
            $file_array[$i][$key] = $files[$key][$i];
        }
    }
    
    return $file_array;
}

function validate_file($file){
    $allowed_types = array('image/jpeg', 'image/png', 'image/gif');
    $max_size = 5242880; // 5MB
    
    if(in_array($file['type'], $allowed_types) && $file['size'] <= $max_size){
        return true;
    }
    
    return false;
}

function generate_unique_filename($filename){
    $extension = pathinfo($filename, PATHINFO_EXTENSION);
    $new_filename = uniqid() . '.' . $extension;
    
    return $new_filename;
}

Keywords

file upload PHP server-side validation memory management error handling

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