CURL example with SSL certificate

curl-example.php

<?php
$url = 'https://www.somedomain.com/a-page';
$certificateFile = 'ceritificate.pem';
$certificatePassword = 'password';

$handler = curl_init();

$options = array( 
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_FOLLOWLOCATION => true,
    CURLOPT_SSL_VERIFYHOST => false, //You may need to change this to true
    CURLOPT_SSL_VERIFYPEER => false, //You may need to change this to true
    CURLOPT_URL => $url ,
    CURLOPT_SSLCERT => $certificateFile,
    CURLOPT_SSLCERTPASSWD => $certificatePassword,
);

curl_setopt_array($handler , $options);

$output = curl_exec($handler);

if(!$output) {
    echo "Curl Error : " . curl_error($handler);
} else {
    // Do something with output
}