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<?php

$apiurl = 'https://[instance_url]/services/data/v37.0/sobjects/Lead/';

$headers = [
    'Authorization: Bearer [token]',
    'Content-Type: application/json'
];

$http = curl_init();

curl_setopt($http, CURLOPT_HEADER, false);
curl_setopt($http, CURLOPT_RETURNTRANSFER, true);

curl_setopt($http,CURLOPT_URL, $apiurl);

$results = curl_exec($http);
$http_status = curl_getinfo($http, CURLINFO_HTTP_CODE);
$info = curl_getinfo($http);

$results_json = json_decode($results);

curl_close($http);
?>