How to Use TLS 1.2 with cURL PHP

Written by Rahul, Updated on August 17, 2019

Most of the Web/API services providers are shifting their environments to TLS 1.2 or greater. So to consume their services via PHP applications, you also need to force your application to use TLS 1.2 during making a connection. This tutorial will help you, how to use TLS 1.2 with PHP cURL.

You can add the following code to your curl requests to use TLS 1.2. Use 6 as the value of CURLOPT_SSLVERSION forces cURL to use TLS 1.2.

curl_setopt ($ch, CURLOPT_SSLVERSION, 6);

1	curl_setopt ($ch, CURLOPT_SSLVERSION, 6);

Here is a sample script of our previous tutorial of submitting JSON data with cURL and PHP.

<?php
// A sample PHP Script to POST data using cURL
// Data in JSON format
 
$data = array(
    'username' => 'tecadmin',
    'password' => '012345678'
);
 
$payload = json_encode($data);

$ch = curl_init('https://api.example.com/api/1.0/user/login');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLINFO_HEADER_OUT, true);

curl_setopt ($ch, CURLOPT_SSLVERSION, 6);  //Force requsts to use TLS 1.2
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);
 

curl_setopt($ch, CURLOPT_HTTPHEADER, array(
    'Content-Type: application/json',
    'Content-Length: ' . strlen($payload))
);
 
$result = curl_exec($ch);
curl_close($ch);
?>

<?php

// A sample PHP Script to POST data using cURL

// Data in JSON format

$data = array(

'username' => 'tecadmin',

'password' => '012345678'

);

$payload = json_encode($data);

$ch = curl_init('https://api.example.com/api/1.0/user/login');

curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

curl_setopt($ch, CURLINFO_HEADER_OUT, true);

curl_setopt ($ch, CURLOPT_SSLVERSION, 6); //Force requsts to use TLS 1.2

curl_setopt($ch, CURLOPT_POST, true);

curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);

curl_setopt($ch, CURLOPT_HTTPHEADER, array(

'Content-Type: application/json',

'Content-Length: ' . strlen($payload))

);

$result = curl_exec($ch);

curl_close($ch);

All done.

Rahul

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