How to Integrate SMS API with PHP in 10 Minutes

Prerequisites

Integrating SMS capability into your PHP application is easier than you think. You will need:

1. An account with OnlineSMSService (Get API Key)
2. PHP 7.4 or higher installed
3. cURL extension enabled

Step 1: Get Your API Key

Login to your dashboard and navigate to Settings > API Keys. Copy your API Key.

Step 2: The PHP Code

Here is a robust function to send SMS using cURL:

function sendSMS($numbers, $message) {
    $apiKey = "YOUR_API_KEY";
    $senderId = "YOUR_SENDER_ID"; // e.g., ONLSMS
    
    // Prepare data
    $data = [
        "apikey" => $apiKey,
        "sender" => $senderId,
        "numbers" => $numbers,
        "message" => $message
    ];
    
    // Initialize cURL
    $ch = curl_init("https://api.onlinesmsservice.com/send");
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($data));
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    
    // Execute
    $response = curl_exec($ch);
    curl_close($ch);
    
    return json_decode($response, true);
}

// Usage
$result = sendSMS("919876543210", "Your OTP is 123456");
print_r($result);

Step 3: Handle the Response

The API will return a JSON response indicating success or failure. Always check the `status` field.

{
    "status": "success",
    "message_id": "MSG123456789",
    "cost": 0.10
}

Tips for Production

• Always run SMS calls asynchronously (using Queues) to avoid blocking your page load.
• Log all API responses for debugging.
• Monitor your credit balance using the Balance API.

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