How to loop through $_POST passing each post field as a parameter to a function?Edit [closed]

Answer 1

Assuming that you are tyring to create a validation function named as isvalid;

function isvalid($input) {
    return ('' !== trim($input));
}

// loop
$errors = arrray();
foreach ($_POST as $key => $value) {
    if (!isvalid($value)) {
        $errors[] = "$key not be empty!";
    }
}
print_r($errors);

Meanwhile, if $_POST input is not isset, then it won't be in foreach.