php file get contents post

1$postdata = http_build_query([
2 	'var1' => 'some content',
3    'var2' => 'doh'
4]);
5
6$opts = [
7  'https' =>
8    [
9    	'method'  => 'POST',
10        'header'  => 'Content-Type: application/x-www-form-urlencoded',
11        'content' => $postdata
12    ]
13);
14
15$result = file_get_contents('http://example.com/submit.php', false, stream_context_create($opts));