$ch = curl_init('http://siteadresi.com/');
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, [
'postField1' => 'post içeriği 1',
'postField2' => 'post içeriği 2',
'fileName' => curl_file_create('./filepath.png')
]);
$result = curl_exec($ch);