How to send a cURL request with a specific IP address in PHP?

To send a cURL request with a specific IP address in PHP, you can make use of the CURLOPT_INTERFACE option in the cURL library. This option allows you to specify the network interface which cURL will use for the connection. Here's an example:

// Set the IP address you want to use
$ipAddress = 'your_desired_ip_address';

// Initialize cURL
$ch = curl_init();

// Set the cURL options
curl_setopt($ch, CURLOPT_URL, 'http://example.com');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_INTERFACE, $ipAddress);

// Execute the cURL request
$response = curl_exec($ch);

// Check for errors
if(curl_errno($ch)){
    echo 'cURL error: ' . curl_error($ch);
}

// Close cURL
curl_close($ch);

// Process the response
echo $response;

In the above example, you'll need to replace 'your_desired_ip_address' with the specific IP address you want to use. The CURLOPT_INTERFACE option is then set using the curl_setopt() function with the $ch handle returned by curl_init(). Note that this method will only work if the specified IP address is assigned to a network interface available on your server.