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PHP - What is PHP PHP stands for PHP Hypertext Preprocessor...

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What is PHP? PHP stands for P HP: H ypertext P reprocessor PHP is a server-side scripting language, like ASP PHP scripts are executed on the server PHP supports many databases (MySQL, Informix, Oracle, Sybase, Solid, PostgreSQL, Generic ODBC, etc.) PHP is an open source software PHP is free to download and use What is a PHP File? PHP files can contain text, HTML tags and scripts PHP files are returned to the browser as plain HTML PHP files have a file extension of ".php", ".php3", or ".phtml" What is MySQL? MySQL is a database server MySQL is ideal for both small and large applications MySQL supports standard SQL MySQL compiles on a number of platforms MySQL is free to download and use PHP + MySQL PHP combined with MySQL are cross-platform (you can develop in Windows and serve on a Unix platform) Why PHP? PHP runs on different platforms (Windows, Linux, Unix, etc.) PHP is compatible with almost all servers used today (Apache, IIS, etc.) PHP is FREE to download from the official PHP resource: www.php.net PHP is easy to learn and runs efficiently on the server side Where to Start? To get access to a web server with PHP support, you can: Install Apache (or IIS) on your own server, install PHP, and MySQL Or find a web hosting plan with PHP and MySQL support Basic PHP Syntax 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 ?>. For maximum compatibility, we recommend that you use the standard form (<?php) rather than the shorthand form. A PHP file normally contains HTML tags, just like an HTML file, and some PHP scripting code.
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Below, we have an example of a simple PHP script which sends the text "Hello World" to the browser: <html> <body> <?php echo "Hello World"; ?> </body> </html> Each code line in PHP must end with a semicolon. The semicolon is a separator and is used to distinguish one set of instructions from another. There are two basic statements to output text with PHP: echo and print . In the example above we have used the echo statement to output the text "Hello World". Note: The file must have a .php extension. If the file has a .html extension, the PHP code will not be executed. <html> <body> <?php //This is a comment /* This is a comment block */ ?> </body> </html> Variables in PHP Variables are used for storing a values, like text strings, numbers or arrays.When a variable is declared, it can be used over and over again in your script.All variables in PHP start with a $ sign symbol.The correct way of declaring a variable in PHP: $var_name = value; New PHP programmers often forget the $ sign at the beginning of the variable. In that case it will not work.Let's try creating a variable containing a string, and a variable containing a number: <?php $txt="Hello World!"; $x=16; ?> String Variables in PHP String variables are used for values that contains characters.In this chapter we are going to look at the most common functions and operators used to manipulate strings in PHP.After we create a string we
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