<?php
function getPublicInfo($username) {
    $url     = sprintf("https://www.instagram.com/$username");
    $content = file_get_contents($url);
    $content = explode("window._sharedData = ", $content)[1];
    $content = explode(";</script>", $content)[0];
    $data    = json_decode($content, true);
    return $data['entry_data']['ProfilePage'][0];
}