<?php

$numaralar = [5051234567, 5441234568, 5448974521];

$numaralar =  implode(',', $numaralar);

function SMSgonderHttpGET($numaralar){

  $username = "850303xxxx"; //
  $password = urlencode("xxxx"); //

  $url= "https://api.netgsm.com.tr/sms/send/get/?usercode=kullanicidiniz&password=sifreniz&gsmno=".$numaralar."&message=testmesaji&msgheader=MesajBaslik";

  $ch = curl_init($url);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
  curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
  $http_response = curl_exec($ch);
  $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);

  if($http_code != 200){
    echo "$http_code $http_response\n";
    return false;
  }
  $balanceInfo = $http_response;
  echo "MesajID : $balanceInfo";
  return $balanceInfo;
}

SMSgonderHttpGET($numaralar);
?>