Você pode postar a imagem em php neste formato.
if(isset($_FILES['image']))
{
$img_name = $_FILES['image']['name']; //getting user uploaded name
$img_type = $_FILES['image']['type']; //getting user uploaded img type
$tmp_name = $_FILES['image']['tmp_name']; //this temporary name is used to save/move file in our folder.
// let's explode image and get the last name(extension) like jpg, png
$img_explode = explode(".",$img_name);
$img_ext = end($img_explode); //here we get the extension of an user uploaded img file
$extension= ['png','jpeg','jpg','gif'];
