InstaJson.php

<?php
set_time_limit(0);
function curl($fullurl, $kuki)
{
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_HEADER, 0);
    // curl_setopt($ch, CURLOPT_VERBOSE, 1);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
    curl_setopt($ch, CURLOPT_FAILONERROR, 0);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
    curl_setopt($ch, CURLOPT_URL, $fullurl);
    curl_setopt($ch, CURLOPT_COOKIE, $kuki);
    $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    $returned = curl_exec($ch);
    return ($returned);
}

$username = "xtrvts";
$json     = curl('https://www.instagram.com/' . $username . '/', false);
preg_match('/window._sharedData\s=\s(.*?);</', $json, $data);
echo $data[1];