PHP is a server-side scripting language designed for web development but also used as a general-purpose programming language. Originally created by Rasmus Lerdorf in 1994,the PHP reference implementation is now produced by The PHP Group PHP originally stood for Personal Home Page,but it now stands for the recursive backronym PHP: Hypertext Preprocessor.
PHP code may be embedded into HTML code, or it can be used in combination with various web template systems, web content management systems and web frameworks. PHP code is usually processed by a PHP interpreter implemented as a module in the web server or as a Common Gateway Interface (CGI) executable. The web server combines the results of the interpreted and executed PHP code, which may be any type of data, including images, with the generated web page. PHP code may also be executed with a command-line interface (CLI) and can be used to implement standalone graphical applications.
The standard PHP interpreter, powered by the Zend Engine, is free software released under the PHP License. PHP has been widely ported and can be deployed on most web servers on almost every operating system and platform, free of charge.
The PHP language evolved without a written formal specification or standard until 2014, leaving the canonical PHP interpreter as a de facto standard. Since 2014 work has gone on to create a formal PHP specification.
The following “Hello, World!” program is written in PHP code embedded in an HTML document:
<!DOCTYPE html> <html> <head> <title>PHP Test</title> </head> <body> <?php echo '<p>Hello World</p>'; ?> </body> </html>
A webform, web form or HTML form on a web page allows a user to enter data that is sent to a server for processing. Forms can resemble paper or database forms because web users fill out the forms using checkboxes, radio buttons, or text fields. For example, forms can be used to enter shipping or credit card data to order a product, or can be used to retrieve search results from a search engine.
PHP is one very common language used for server-side “programming” and is one of the few languages created specifically for web programming.
To use PHP with an HTML form, the URL of the PHP script is specified in the
action attribute of the form tag. The target PHP file then accesses the data passed by the form through PHP’s
$_GET variables, depending on the value of the
method attribute used in the form. Here is a basic form handler PHP script that will post the form’s contents, in this case “user”, to the page using GET:
<html> <body> <form action="form_handler.php" method="GET"> User Name: <input name="user" type="text" /> <input type="submit"value="Submit" /> </form> </body> </html>
<html> <body> <?php // This will print whatever the user put into the form on the form.html page. $name = $_GET['user']; echo "Hello, ". $name ."!"; ?> </body> </html>
alert('Error - Virus installed') into the user name-field, the browser would execute the script on the form_handler.php page, just as if it had been coded by the developer; malicious code could be executed this way. A more secure version of form_handler.php would use PHP’s
htmlspecialchars() functions, or regular expressions to sanitize the user input before doing anything with it.
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