How to get the name of input field with PHP - php

Question

I'm trying to create a function. which will check if the field is empty or not. If the input is empty it'll push an error for that input in the error array.
$errors = ["name" => "Name is required"];
like so
How can I do this?
function checkRequiredFields($fields = [], $errors = [])
{
foreach ($fields as $field) {
if (is_blank($field)) {
$errors[$field] = "$field is required";
}
}
}
btw here's how my is_blank function looks:
function is_blank($value)
{
return !isset($value) || trim($value) === '';
}

Answer 1

You can check that the field has been submitted and doesn't hold the empty string:
<?php
function check_required_fields($fields, &$errors) {
foreach($fields as $fieldname) {
if(isset($_POST[$fieldname]) && $_POST[$fieldname] === '') {
$errors[$fieldname][] = "'$fieldname' is required.";
}
}
}
check_required_fields(['email'], $errors);
?>
<form method='POST'>
<input type='text' name='name'>
<input type='email' name='email'>
<input type='submit'>
</form>

Answer 2

You can get the values of the input fields with
$field = $_GET["field"]; // or $_POST["field"]; depending of your form.
But you need to sanitize properly your input values for security reasons.
https://www.php.net/manual/fr/function.filter-input.php
The empty() function is also what you're looking for.
if (empty($field)) {
$errors[$field] = "$field is required";
}
Checkout the documentation : https://www.php.net/manual/fr/function.empty.php
Take a look at the isset() function also.