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Basic PHP Syntax (The rules that must be followed to write properly structured code. ) PHP's syntax and semantics are similar to most other programming languages (C, Java, Perl) with the addition that all PHP code is contained with a tag, of sorts. All PHP code must be contained within the following... How to Save Your PHP Pages If you have PHP inserted into your HTML and want the web browser to interpret it correctly, then you must save the file with a .php extension, instead of the standard .html extension. So be sure to check that you are saving your files correctly. Instead of index.html, it should be index.php if there is PHP code in the file. A PHP scripting block always starts with <?php and ends with ?>. A PHP scripting block can be placed anywhere in the document. On servers with shorthand support enabled you can start a scripting block with <? and end with ?>. However, for maximum compatibility, we recommend that you use the standard form (<?php) rather than the shorthand form. <?php ?> A PHP file normally contains HTML tags, just like an HTML file, and some PHP scripting code. Simple HTML & PHP Page Below is an example of one of the easiest PHP and HTML page that you can create and still follow web standards. PHP and HTML Code: <html> <head> <title>My First PHP Page</title> </head> <body> <?php echo "Hello World!"; ?> </body> </html> Display: If you save this file and place it on PHP enabled server and load it up in your web browser, then you should see "Hello World!" displayed. If not, please check that you followed our example correctly. We used the PHP function echo to write "Hello World!" and we will be talking in greater depth about this PHP function and many others later on in this tutorial. The Semicolon! As you may or may not have noticed in the above example, there was a semicolon after the line of PHP code. The semicolon signifies the end of a PHP statement and should never be forgotten. For example, if we repeated our "Hello World!" code several times, then we would need to place a semicolon at the end of each statement. PHP and HTML Code: <html> <head> <title>My First PHP Page</title> </head> <body> <?php echo "Hello World! "; echo "Hello World! "; echo "Hello World! "; echo "Hello World! "; echo "Hello World! "; ?> </body> </html>
Display: Hello World! Hello World! Hello World! Hello World! Hello World! White Space As with HTML, whitespace is ignored between PHP statements. This means it is OK to have one line of PHP code, then 20 lines of blank space before the next line of PHP code. You can also press tab to indent your code and the PHP interpreter will ignore those spaces as well. PHP and HTML Code: <html> <head> <title>My First PHP Page</title> </head> <body> <?php echo "Hello World!"; echo "Hello World!"; ?> </body> </html>
Display: This is perfectly legal PHP code. Credits: www.tizag.com
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