Are there any specific PHP functions or methods that can be used to efficiently handle file uploads and downloads?

Handling file uploads and downloads efficiently in PHP can be achieved using the built-in functions `move_uploaded_file()` for uploads and `readfile()` for downloads. These functions are commonly used to handle file transfers securely and efficiently. 

// File upload
if(isset($_FILES['file'])){
    $file = $_FILES['file'];
    $target_dir = "uploads/";
    $target_file = $target_dir . basename($file['name']);
    
    if(move_uploaded_file($file['tmp_name'], $target_file)){
        echo "File uploaded successfully.";
    } else{
        echo "Error uploading file.";
    }
}

// File download
$file_path = "path/to/file.txt";
if(file_exists($file_path)){
    header('Content-Description: File Transfer');
    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment; filename="'.basename($file_path).'"');
    header('Expires: 0');
    header('Cache-Control: must-revalidate');
    header('Pragma: public');
    header('Content-Length: ' . filesize($file_path));
    readfile($file_path);
    exit;
} else{
    echo "File not found.";
}

Keywords

PHP file uploads file downloads handling methods

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