Introduction to PHP (Hypertxet PreProcessor, HyperText Processor)

Part 3

PHP Arrays and Superglobals

References

· Chapter 8 Introduction to Server-Side Development with PHP of the Text Book Entitled Fundamentals of Web Development, by Randy Connolly and Ricardo Hoar

· PHP 5.6.14 Released Oct. 1, 2015

· PHP 5.6.1 Released Oct. 2, 2014, http://php.net/

· PPH Documentation, http://php.net/urlhowto.php

· PHP Language Reference, http://php.net/manual/en/langref.php

Predefined Superglobals, http://php.net/manual/en/language.variables.superglobals.php

Superglobals // Bulit-in variables that are always available in all scopes

· $GLOBALS // All variables available in global scope (array containing info about the

request and the server)

· $_SERVER // Server and execution environment info

· $_GET // HTTP GET variables (array of query string data passed to the server via

the URL)

· $_POST // HTTP POST variables (array of query string data passed to the server

via the HTTP header)

· $_FILES // HTTP file upload variables (array of file items uploaded to the server)

· $_REQUEST // HTTP request variables (array containing the contents of $_GET,

$_POST, and $_COOKIE)

· $_SESSION // Session variables (array contains session data)

· $_ENV // Environment variables (array) of a server

· $_COOKIEs // Array of Cookie data passed to page via HTTP request

HTTP Cookies, http://php.net/manual/en/features.cookies.php

· PHP Supports for HTTP Cookies

· Set the session cookie parameters, http://php.net/manual/en/function.session-set-cookie-params.php

$_SERVER, http://php.net/manual/en/reserved.variables.server.php

· An array containing information such as Headers, Paths, Script Location

· There is no guarantee that every web server will provide any of these ino

· See CGI/1.1 Specification, http://www.faqs.org/rfcs/rfc3875.html

Example 1. A PHP Page that uses print Server retained info in the $_SERVER

Also use date(), http://php.net/manual/en/function.date.php

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

<head>

<title>This HTML page prints out your b</title>

</head>

<body>

This HTML page prints out your browser info and the IP addresses of the HTTP

Request.

Your Computer Name: <?php echo $_SERVER['HTTP_HOST'] ?>

Your Browser is : <?php echo $_SERVER['HTTP_USER_AGENT'] ?>

Your IP address : <?php echo $_SERVER['REMOTE_ADDR'] ?>

Your IP address : <?php echo $_SERVER['REMOTE_PORT'] ?>

Server Name: : <?php echo $_SERVER['SERVER_NAME'] ?>

Server Protocol : <?php echo $_SERVER['SERVER_PROTOCOL'] ?>

Server Software : <?php echo $_SERVER['SERVER_SOFTWARE'] ?>

Request Method : <?php echo $_SERVER['REQUEST_METHOD'] ?>

Request Time : <?php echo $_SERVER['REQUEST_TIME'] ?>

Request Date: <?php echo date("D:d:M:Y:H:i:s") ?>;</body>

</html>

Example 2: A PHP page that shows the contents kept in $_COOKIE from the server that process your form data.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<head>

<title>Displaying the Cookie Contents</title>

</head>

<body>

This PHP page prints out your Cookie Contents.

<?php

setcookie("color", "red");

echo $_COOKIE["color"];

</body>

</html>

PHP Functions Reference

· echo()

· unset() // Destroy variables

· func_get_args() // get function arguments

· func_num_args() // get function argument count

String Manipulation Functions

· strcmp() // string comparison, case sensitive

· strcasecmp() // string comparison, non case sensitive

· substr() // the sub string

· strlen() // The number of chars in the string

· strops() // The character position

· chop() // Remove all white spaces from its ends

· trim() // remove all white spaces from both ends

· strtolower() // covert to lower case characters

· strtoupper() // convert to upper case characters

Arithmetic Functions

· floor(), ceil(), round(), srand(), rand(), abs(), min(), max()

Ouput Functions

· print()

· printf() // formatted output

PHP Functions

· func_get_args() // http://us3.php.net/manual/en/function.func-get-args.php

· func_num_args()

<!DOCTYPE html>

<!—funct_arguments.php - A trivial example to illustrate a php document -->

<head>

<title> funct_arguments.php </title>

</head>

<body>

<?php

function func_dynamic() {

echo “ITC 250/CPET 499 Web Systems: “.func_num_args(). “Number of arguments. ”;

$args = func_get_args();

for($i = 0; $i < count($args); $i++{

echo “Passed arguments: {args[$i]} ;

}

func_dynamic(5, 4, 3, 2, 1 );

</body>

</html>

Oct. 20, 2015

Web Related Variable