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1. introduction to php and variable
- 1. INTRODUCTION TO PHP Source: Pensyarah Uitm Jasin, Melaka
- 2. OUTLINE Introduction to Server Side Script01 Introduction to PHP02 Variables and Data Types03
- 3. How Server Side Script Works Your Text Here request response Web browser/Client Server run server side script run the script generate HTML code Database maybe get some data from database
- 4. Introduction to PHP • PHP : recursive acronym for "PHP Hypertext Preprocessor“ • Developed in 1995 • Widely-used Open Source scripting language that enables to create interactive web sites and can be embedded into HTML. • PHP provides many great features: • free, easy to learn, fun to use, connects to most databases • provides many levels of security • available on most systems: Windows, Linux, Mac OS, etc • lots of built-in functions
- 5. Getting PHP to Work Three important components need to be installed on the computer system: Web server – e.g. Apache (most widely used free), IIS, PWS PHP software distribution (parser) Latest stable release is PHP 4.3.7 PHP version 5 is also available, but this is considered a “release candidate”. Database – e.g. MySQL (most popular RDBMS used over the Internet free, fast, flawless), Oracle, Sybase
- 6. PHP Basic Syntax • All PHP code must be included inside one of these special markup tags: • PHP files must be saved with a php extension, e.g.: .php, .php3 or .php4 • Every statement in PHP must be terminated with a semicolon (;) • PHP is not generally case-sensitive • Characters to indicate Comments: • // or # : single-line comment • /* here is an introduction to server side script code inside a multi-line comment */ : multi-line comment <?php php code goes here ?> <script language=“php”> php code goes here </script>
- 7. Example 1 Save as exe1.php Output <html> <?php echo “<h1> Hello, World!</h1>”; ?> </html>
- 8. Variables and Data Types • A variable contains a piece of data. • e.g.: number of records in a database, person’s name, • PHP is a “loosely typed” language. • a single variable may contain any type of data. • e.g.: a number (integer/floating point), a string of text or Boolean values. • not need to declare a variable to be a specific data type • All variables in PHP begin with a $ (dollar sign). • Variable names are case sensitive. $name = “Ahmad”; // assign a string “Ahmad” to $name $x = 45; // assign an integer 45 to $x