Problem:- Validating Number Form Input

Solution:-

<?php 

if ($_SERVER['REQUEST_METHOD']=='GET') {?>

<form action="<?php echo htmlentities($_SERVER['SCRIPT_NAME']); ?>" method="POST" >
 <input type="text" name="number"><br>
 <input type="submit" value="Show">
</form>

<?php
}else{
 if (filter_input(INPUT_POST, 'number', FILTER_VALIDATE_INT)) {
  echo $_POST['number'];
  }else{
   echo $_POST['number'], ' isn\'t a number';
  }
}
 


 ?>

इसे भी पढ़े – Redirecting to a Different Location Via Posted Form