Are there any specific functions or methods in PHP that are commonly used for sending SMS messages?

To send SMS messages in PHP, you can use various APIs provided by SMS service providers such as Twilio, Nexmo, or Plivo. These APIs allow you to send SMS messages programmatically by making HTTP requests to their endpoints with the necessary parameters like recipient number, message content, and authentication credentials.

// Using Twilio API to send an SMS message
require __DIR__ . '/twilio-php/Services/Twilio.php';

$sid = "YOUR_TWILIO_ACCOUNT_SID";
$token = "YOUR_TWILIO_AUTH_TOKEN";
$twilio_number = "YOUR_TWILIO_PHONE_NUMBER";

$client = new Services_Twilio($sid, $token);

$message = $client->account->messages->create(
    array(
        "From" => $twilio_number,
        "To" => "+15555555555",
        "Body" => "Hello, this is a test message from Twilio!"
    )
);

echo "Message sent: " . $message->sid;