<?php

//Your authentication key
$authKey = "YourAuthKey";

//Multiple mobiles numbers separated by comma
$mobileNumber = "9999999";

//Your voice file url
$file_url = "https://apitxt.com/filename.mp3";

//Your voice file id
$file_id = "V3BWYXpVSk5Ncms3ZUNVMTdON0IyUT09";
Note:-"File Url or File Id one required";

//Define route
$route = "1 or 4";

//Schedule voice
$schedule = "YYYY-MM-DD HH:MM"; //Time should be 24-hour format
//Prepare you post parameters
$postData = array(
       'authkey' => $authKey,
       'mobiles' => $mobileNumber,
       'file_url' => $file_url,
       'file_id' => $file_id,
       'route' => $route,
       'schedule' => $schedule
);

//API URL
$url="https://apitxt.com/api/sendVoiceSms";

// init the resource
$ch = curl_init();
curl_setopt_array($ch, array(
       CURLOPT_URL => $url,
       CURLOPT_RETURNTRANSFER => true,
       CURLOPT_POST => true,
       CURLOPT_POSTFIELDS => $postData
       //,CURLOPT_FOLLOWLOCATION => true
));

//Ignore SSL certificate verification
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);

//get response
$output = curl_exec($ch);

//Print error if any
if(curl_errno($ch))
{
     echo 'error:' . curl_error($ch);

}

curl_close($ch);

echo $output;
?>