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Passing Variables to PHP Scripts

We will be discussing how to pass a variable from a HTML file to a PHP script. Basically this can be done in two ways:

  1. Using HTML forms. This has been discussed in my previous article.
  2. Using Link <A> Tag. If you had noticed closely, when using 'get' as the value of the attribute method in a form, the variables in the form are passed on as URL to the calling script. We will be using this technique in the <A> tag also. I will explain the concept with an example.

Example

Files:

  1. bgchooser.html
  2. bgprocess.php

What it does?

The bgchooser.html has three links:

  • Red Background with Black Text
  • Green Background with Red Text
  • Blue Background with White Text

When a particular link is clicked, the file bgprocess.php is opened with the chosen background and text color.

The Code

File I:bgchooser.html

<html>
<head>
<title>indiWiz.com PHP Tutorial</title>
</head>
<body>
<p>Choose Colors for the next page:
<ul>
<li><a href="bgprocess.php?bg=red&text=black">Red Background with Black Text</a>
<li><a href="bgprocess.php?bg=green&text=red">Green Background with Red Text</a>
<li><a href="bgprocess.php?bg=blue&text=white">Blue Background with White Text</a>
</ul>
</body>
</html>

Note: All the links call the file bgprocess.php. But as you notice, after the filename bgprocess.php there is a question mark(?). The part after the question mark in the URL indicates the script variable values. The variables are bg and text. Both are separated by an ampersand(&) sign.

File II:bgprocess.php

<html>
<head>
<title>indiWiz.com - PHP Tutorial</title>
</head>
<body bgcolor="<?php echo $_GET['bg']; ?>" text="<?php echo $_GET['text']; ?>">
<p>Customised Background & Text!
</body>
</html>

Note: In the <body> bgcolor attribute, we print the value contained in the variable $_GET['bg']. Similarly, for the text attribute of the <body> tag, we print the value contained in the variable $_GET['text'].

Demo of this example.

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