PHP105 and a half
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A word about include statements
A useful function in PHP is to include the contents of fileX in fileY at a given point.
For example:
- You could
- include a menu file in each page
- or a CSS file dynamically created from a database
- or any number of other ideas
Menu Include Example
Create the following file and save it as "menu.php"
<table border=1>
<tr>
<td><a href="page1.php">Page 1</a></td>
<td><a href="page2.php">Page 2</a></td>
<td><a href="page3.php">Page 3</a></td>
</tr>
</table>
Now create the following and save it as "page1.php"
<html><head><title>Page1</title></head>
<body>
<? include ("menu.php"); ?>
<p>this is the content of page 1</p>
</body>
</html>
Now create the following and save it as "page2.php"
<html><head><title>Page2</title></head>
<body>
<? include ("menu.php"); ?>
<p>this is the content of page 2</p>
</body>
</html>
EXERCISE: See if you can create the third page??
Dynamic CSS?
Create the following 2 cascading style sheets:
save the following as "style0.css"
h1
{ color:green; }
save the following as "style1.css"
h1
{ color:blue; }
save the following as "style2.css"
h1
{ color:red; }
save the following as "page4.php"
<html>
<head>
<title>Dynamic CSS</title>
<?
if (isset($_POST["style"]))
{
$thisStyle=$_POST["style"];
}
else
{
$thisStyle="0";
}
print "<link rel=\"stylesheet\" href=\"style".$thisStyle.".css\">";
?>
</head>
<body>
<h1>What colour is this heading?</h1>
<form method="post" action="<?= $_SERVER["PHP_SELF"]; ?>">
<input type="submit" name="style" value="0"><BR>
<input type="submit" name="style" value="1"><BR>
<input type="submit" name="style" value="2">
</form>
</body>
</html>
EXERCISE: See if you can create a third stylesheet??
EXERCISE: See if you can change the buttons for radio buttons or a drop down list??
