Combining PHP and HTML in one script |
<html>
<head> this is where you put information
To combine PHP with HTML we use the PHP code markers (<?php and ?>)to indicate the beginning and end of the PHP code. This is meant not to confuse the compiler on how PHP and HTML code should be interpreted. For example: <html>
<head> PHP and HTML combination </head>
<body>
<?php
echo "Printing my PHP data";
?>
</body>
</html>As you can see from the above example, there is really not too much about it. Now all that you have to do with this file is save it as a .php document and deploy to your web server. As a matter of fact, you can even save your html files as .php and they should run okay. The only difference between the code snippets (one with pure HTML and the one with PHP) is that the one with PHP code in it gives you the flexibility of using logic in your program, where as the one with pure HTML does not. Example of Using PHP for logic programmingIn this code I will demonstrate how useful it is to combine PHP and HTML. Say now that we have a website that sells shoes. The price for shoes of any given brand is determined by the selected shoe size. HTML alone will not be able to compute the pricing logic, but using a combination of HTML and PHP we will compute the price and display it for the customers to see. <html>
<head> PHP and HTML combination </head>
<body>
<?php
switch($shoe_size){
case 9: $price = 89.45;
break;
case 8: $price = 79.45;
break;
case 7: $price = 69.45;
break;
}
echo "The price for the shoe size you selected is: $price";
?>
</body>
</html>Code interpretationAssuming that we supplied the value 9 for variable $shoe_size, this code will evaluate the value, if the value is 9, it is going to return the price of 89.45, if the size if 8, the price will be 79.45 and so forth. If you are having trouble understanding how the switch() function work, please see our posting on PHP control flow functions . It is easy to follow too. In the next few postings we will discuss the use of HTML forms. If you hang in long enough to see this section you will appreciate the value of combining the two languages and how you can use them together to produce dynamic web sites. |
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