Form processing $_POST to variables automatically - php

Question

I have about 40 items in my FORM and i'm trying to give all the Name= properties a variable for process without having to write each out manually. am I missing something here, cause the code below is not working. (name="comp1", name="comp2"... $comp1, $comp2)
$en = array_merge($em, $_POST);
$valid = true;
foreach($_POST as $value) {
if(!isset($value)) {
$valid = false;
}
}

Answer 1

If something is not in $_POST, the foreach will not loop through it. Isset() will always return true, because the foreach loops through all values in $_POST.

Answer 2

foreach($_POST as $k=>$val) {
//$$k = $val;
if(!isset($$k)){
echo "==NO==";
}
}

Answer 3

the POST will always be set, unless you disable the field with something like this:
<input disabled="disabled"/>
If the filds doesn't have this attribute, the only way to check if the field was filled is a comparse with an empty string, with $value == '' this way:
foreach($_POST as $key => $value) {
if($value == '') {
$valid[$key] = false;
}else{
$valid[$key] = true;
}
}
You will have now an array ($valid) that will look like:
var_dump($valid['field1']); //prints true, the field was filled
var_dump($valid['field2']); //prints false, the field was NOT filled