[RESOLVED] Grabbing the $_POST name

[netfrugal]

For debugging purposes, I want to know if any stray POST variables are making it to specific scripts of mine.

Usually, I simply know the POST name value like:

$var = $_POST['fieldname'];

And I can do a simple <pre> listing, if I want:

echo '<pre>';
print_r($_POST,false);
echo '</pre>';

Which gives me:

Array
(
[firstname] => john
[lastname] => smith
[Submit] => Submit
)

So, for kicks, I want to alert myself if there's some unknown POST variable being passed. Which means I need to know what POST variables are to be expected:

$expected_post_names = array("firstname","lastname","Submit");

Any thoughts on how to compare the expected array to what's being passed?

[netfrugal]

Figured it out!

$expected_post_names = array("some_form_field1","some_form_field2","some_form_field3");

foreach (array_keys($_POST) as $key_passed_from_elsewhere) {
	if(!in_array("$key_passed_from_elsewhere",$expected_post_names)){ echo "There is an unknown key: $key_passed_from_elsewhere"; }else{ echo "That field name exists in the array"; } 
}

[johanafm]

Personally I'd go with

$not_ok = array_diff($_POST, $expected);

foreach($not_ok as $k => $v)
	echo "Unknown key: $k";