Question

foreach($_POST as $key => $value) {
    if($value)
        $sorted[$parent_key][$newkey] = $value;
    else
        unset($_POST[$key]);

$value could be ‘0’ or ‘any string text.’ How can I validate $value so it passes if a ‘0’ is entered?

I cannot use isset($value) because the $value is set from the foreach.
I cannot use empty($value) because it treats the 0 as null.
I cannot use strlen($value) because it treats the 0 as null.
I cannot use (!$value) because it treats the 0 as null.

Answer 1

You can use strlen($value) because it does not treat the 0 as null.
here is the proof

$a = 0;
echo strlen($a);

Outputs:

1