php download a binary

php-dwn-bin.php

$data = 'hello world';
$source_url = 'https://domain.com/chart?chid=' . md5(uniqid(rand(), true));

// params (http_build_query will later urlencode)
$qrcode = array(
	'cht' => 'qr',
	'chs' => '177x177',
	'chl' => $data);

// send the request
$context = stream_context_create(
	array('http' => array(
		'method' => 'POST',
		'content' => http_build_query($qrcode))));

// save the returned bytes
file_put_contents($savepath,fopen($source_url, 'r', false, $context));