PHP/String/strval

Checking for an integer

   <source lang="html4strict">

if ($_POST["age"] != strval(intval($_POST["age"])) {

   $errors[] = "Please enter a valid age.";

}

 </source>
   
  

Validating an integer with typecasting

   <source lang="html4strict">

<?php if ($_POST["rating"] != strval(intval($_POST["rating"]))) {

  print "Your rating must be an integer.";

} ?>

 </source>