Write a script for Square of Asterisks?

I used nested loop in this script for creating square of Asterisks. I used for loop 1st then i used while loop within for loop and then I used if conditional statement to create break.
Try this code.

---

 <?PHP  
      $inputs = array();  
      if (isset($_POST['submit'])) { //to check if the form was submitted  
           $value = isset($_POST['input0'])? $_POST['input0'] : null;  
           for($count = 1; $value != null; $count++){  
                array_push($inputs, $value);  
                $value = isset($_POST['input'.$count])? $_POST['input'.$count] : null;  
           }  
      }  
      var_dump($inputs);  
 ?>       
 <form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">  
   <!-- to take multiple inputs copy the below line and change name="input" attribute -->  
   Enter input 1:&nbsp;<input type="text" name="input0" value="" /><br />  
   <input type="submit" name="submit" value="Submit" />  
 </form>  
 <?php  
   for ($a=1 ; $a<= $inputs[0]; $a++)  
   {  
   $x = $inputs[0];  
   $y = 1;  
   while ($y <= $x)  
   {  
     echo "*";  
     if($y==$x)  
     {  
       echo "<br />";  
     }  
     $y++;  
   }  
   }  
 ?>