<?php // Demo for PUT vs. PATCH
if($_SERVER['REQUEST_METHOD'] == 'GET') {
    echo "This is a get request.\n";
    echo "It just retrieves all fields.\n\n";
} 
elseif($_SERVER['REQUEST_METHOD'] == 'PUT') {
    echo "This is a put request to an id. It must send entire record.\n";
    parse_str(file_get_contents("php://input"),$post_vars); // there is no $_PUT, so we use this to get the entity-body
     echo "Must send all fields, even if only one changes.\n";
    echo $post_vars['fruit']." is the fruit\n";
    echo "There are ".$post_vars['quantity']." of them.\n\n";
}
elseif($_SERVER['REQUEST_METHOD'] == 'PATCH') { // patch is a new http method verb for partial updates
    echo "This is a patch request. It can do partial updates to an id.\n";
    parse_str(file_get_contents("php://input"),$post_vars);
    echo "Possibly sends only one field such as the fruit.\n";
    echo $post_vars['fruit']." is the fruit\n";
    echo "There are the old quantity of them.\n\n";
}
elseif($_SERVER['REQUEST_METHOD'] == 'POST') { // patch is a new http method verb for partial updates
    echo "This is a post request. It creates new resources.\n";
    echo "No id should be sent.\n";
    echo $_POST['fruit']." is the fruit w/a new id.\n";
    echo "There are ".$_POST['quantity']." of them.\n\n";
}
/*
=> curl -X PUT https://userpages.umbc.edu/~jianwu/is651/programs/ch11/put.php -d "id=1&fruit=orange&quantity=4"
This is a put request. It must send entire record.
Must send all fields, even if only one changes.
orange is the fruit
There are 4 of them.

=> curl -X PATCH https://userpages.umbc.edu/~jianwu/is651/programs/ch11/put.php -d "id=1&fruit=apple"
This is a patch request. It can do partial updates to an id.
Possibly sends only one field such as the fruit.
apple is the fruit
There are the old quantity of them.
*/
?>