Appendix A. Solutions to Exercises

Exercise Solution

The trick here is to make a second call to date(), passing in the appropriate characters to display the current date. Here's how you might write the script (including comments where appropriate):

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
  <head>
    <title>Hello</title>
    <link rel="stylesheet" type="text/css" href="common.css" />
  </head>
  <body>
   <h1>
<?php

// Get the current time in a readable format
$currentTime = date( "g:i:s a" );

// Get the current date in a readable format
$currentDate = date( "M j, Y" );

// Display greeting, time and date to the visitor
echo "Hello, world! The current time is $currentTime on $currentDate";

?>
    </h1>
  </body>
</html>

Exercise 1 Solution

Write a PHP script such as this:

<?php
$x = 5;
$x = $x + 1;
$x += 1;
$x++;
echo $x;
?>

Exercise 2 Solution

Write a PHP script such as this:

<?php
$x = 3;
$y = 4;
echo "Test 1 result: " . ($x == $y) . "<br />";
echo "Test 2 result: " . ($x > $y) . "<br />";
echo "Test 3 result: " . ($x <= $y) . "<br />";
echo "Test 4 result: " . ($x != $y) . "<br />";
?>

Exercise 1 Solution

You could write this script many ways. The following solution creates a for loop to count the numbers, then uses the ? (ternary) operator and a switch construct to determine if each number is odd, even, or prime.

<!DOCTYPE html PUBLIC "-//W3C//DTD ...

Get Beginning PHP 5.3 now with the O’Reilly learning platform.

O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.

Start your free trial