freeCodeCamp/guide/english/php/forms/checking-required-inputs/index.md

title
Checking Required Inputs

Checking Required Inputs

PHP has a few functions to check if the required inputs have been met. Those functions are isset, empty, and is_numeric.

Checking form to make sure its set

The isset checks to see if the field has been set and isn't null. Example:

$firstName = $_GET['firstName']

if(isset($firstName)){
  echo "firstName field is set". "<br>";
}
else{
  echo "The field is not set."."<br>";
}