<?php


function busca_cepCurl($cep){

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, "http://republicavirtual.com.br/web_cep.php?cep=".$cep."&formato=json");
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 0);
    $c = curl_exec($ch);
    return  json_decode($c,true);


}


var_dump(busca_cepCurl('75600-000'));