How can PHP developers avoid security vulnerabilities when using exec with URLs?

When using exec with URLs in PHP, developers should validate and sanitize user input to prevent command injection attacks. One way to avoid security vulnerabilities is to use escapeshellarg() or escapeshellcmd() functions to escape user input before passing it to exec. Additionally, limiting the characters and commands that can be executed can also help mitigate risks. 

$user_input = $_GET['url'];
$escaped_input = escapeshellarg($user_input);
exec("command " . $escaped_input);

Keywords

PHP exec security vulnerabilities URLs input validation

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