Thanks guys. I have now changed the original php.ini file and it shows errors on a page. The old file has the code below.

Code:
Common Values:
;   E_ALL & ~E_NOTICE  (Show all errors, except for notices and coding standards warnings.)
;   E_ALL & ~E_NOTICE | E_STRICT  (Show all errors, except for notices)
;   E_COMPILE_ERROR|E_RECOVERABLE_ERROR|E_ERROR|E_CORE_ERROR  (Show only errors)
;   E_ALL | E_STRICT  (Show all errors, warnings and notices including coding standards.)
; Default Value: E_ALL & ~E_NOTICE
; Development Value: E_ALL | E_STRICT
; Production Value: E_ALL & ~E_DEPRECATED
; http://php.net/error-reporting
 error_reporting = E_ALL & ~E_NOTICE & ~E_DEPRECATED
After changing it, the new file looks like what is shown below.
Code:
Common Values:
;   E_ALL & ~E_NOTICE  (Show all errors, except for notices and coding standards warnings.)
;   E_ALL & ~E_NOTICE | E_STRICT  (Show all errors, except for notices)
;   E_COMPILE_ERROR|E_RECOVERABLE_ERROR|E_ERROR|E_CORE_ERROR  (Show only errors)
;   E_ALL | E_STRICT  (Show all errors, warnings and notices including coding standards.)
; Default Value: E_ALL & ~E_NOTICE
; Development Value: E_ALL | E_STRICT
; Production Value: E_ALL & ~E_DEPRECATED
; http://php.net/error-reporting
 error_reporting = E_ALL | E_STRICT
And when I previewed my work below,
Code:
 <html>
  <head>
    <title>Modern Day car dealers</title>
     </head>

   <body>

  <?php
  echo "<p>Welcome to Modern Day car dealers!</p>";
  ?>

<?php
  $carsInStock  = array("Honda", "Volvo", "Ford", "Toyota");
   $prices = array("$23,000", "$34,000", "$36,000", "$22,000");

    echo "At Modern Day car dealers, a brand new" . " " . "$carsInStock[3]" .
 " " . " car costs only" . " " . "$prices[3].";

   echo "<br />";
     echo "$decoration";
 ?>
 

<?php echo $myvar; ?>


    </body>
   </html>
it shows the information below.
Code:
Welcome to Modern Day car dealers!

At Modern Day car dealers, a brand new Toyota car costs only $22,000.

Notice: Undefined variable: decoration in C:\xampp\htdocs\menre\md.php on line 19

Notice: Undefined variable: myvar in C:\xampp\htdocs\menre\md.php on line 23