What are the potential pitfalls or security concerns when implementing SMS functionality with PHP?

One potential security concern when implementing SMS functionality with PHP is the risk of exposing sensitive information, such as API keys or user phone numbers, in the code. To mitigate this risk, it is important to store sensitive information in environment variables and access them securely in the code. 

// Store sensitive information in environment variables
$api_key = getenv('SMS_API_KEY');
$phone_number = getenv('USER_PHONE_NUMBER');

// Access sensitive information securely in the code
// Example of sending an SMS using Twilio API
$client = new Twilio\Rest\Client($api_key, $api_secret);
$message = $client->messages->create(
    $phone_number,
    array(
        'from' => '+1234567890',
        'body' => 'This is a test message.'
    )
);

Keywords

SMS functionality PHP security vulnerabilities injection attacks authentication encryption

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