Are there alternative methods in PHP, such as curl or file_get_contents, that can be used instead of shell_exec for downloading files?

Using alternative methods like curl or file_get_contents in PHP can be a safer and more secure way to download files compared to using shell_exec, which executes shell commands. These methods allow you to fetch remote files without the need for executing external commands, reducing the risk of security vulnerabilities.

// Using file_get_contents to download a file
$url = 'http://example.com/file.txt';
$fileContents = file_get_contents($url);
file_put_contents('downloaded_file.txt', $fileContents);

// Using curl to download a file
$url = 'http://example.com/file.txt';
$ch = curl_init($url);
$fp = fopen('downloaded_file.txt', 'w');
curl_setopt($ch, CURLOPT_FILE, $fp);
curl_exec($ch);
curl_close($ch);
fclose($fp);