How can PHP differentiate between 0 as a number or string when passed through a form?

When a form is submitted, PHP treats all form inputs as strings by default. To differentiate between 0 as a number or string, you can use the `is_numeric()` function to check if the input is a number. If it is a number, you can convert it to an integer using `intval()`. 

$input = $_POST['input'];

if (is_numeric($input)) {
    $number = intval($input);
    echo "Input is a number: $number";
} else {
    echo "Input is a string: $input";
}

Keywords

PHP type juggling is_numeric is_string form input

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