Creating PHP Pages

PHP

Overview of PHP Structure and Syntax

a The extension of php file is .php
a This extension signifies to the server that it needs to parse the php code before sending the resulting html code to the viewer's web browser.
a PHP is denoted in the page with opening and closing tags, as follows,

..... ..... ....
..... ..... ....
?>

The lines end with a semicolon.

echo "What is you name?";
echo $name;
?>

a You can add comments frequently in you code.

// This is a comment statement that is not compiled by web server;
/* You can use this kind of comment also when;
you need to write multi-lined text as comment */;
?>

a Some few PHP coding are given below;

echo "

Hi $_POST['fname']

";
echo "

Your name's not Jeo, so you can't enter the web site.

";
?>

Or

echo "

";
echo "Hi";
echo "$_POST['fname']";
echo "

";
?>

Considerations with HTML Inside PHP

a You have to check for double quotes. Ex: echo "";
a Remember that you still have to follow PHP rules, even though you're coding in HTML.
a Don't try cram too much HTML into your PHP sections.

Using Constants and Variables

Constant:

Syntax:
define("CONSTANT NAME","VALUES")

define ("FAVMOVIE","The Life of Brian");
?>

Overview of variables

a Variables are denoted with a dollar sign ($).
a They are case-sensitive.
a The first letter of the variable name must be an underscore or letter and cannot be a number.

Example,

$variable_of_php=10;
$variable_of_php="Susanta";
$variable_of_php=13.23;
$variable_of_php=99999;
?>

Mathematical statement in PHP

$variable1=10;
$variable2=23;
$variable3=4;
$variable4=9;

$variable5=(($variable1 + $variable1 + $variable1 + $variable1) / 4 );

echo "The average movie rating for this movie is : ";
echo $variable5;
?>

Function Description
rand([min],[max]) Generates a random integer.
ceil(number) Rounds a decimal up to the next highest integer.
floor(number) Rounds a decimal down to the next lowest integer.
max(argument1,argument2, ...) Returns the maximum value of the supplied arguments.
min(argument1,argument2, ...) Returns the minimum value of the supplied arguments.

Passing Variables Between Pages

There are basically four ways to accomplish this task;

1) Pass the variables in the URL.
2) Through a session.
3) Via a cookie
4) With an HTML form.

A Word about register_global

a This is a configuration setting in your php.ini
a Coding with the assumption that register_globals has been turned off is the safest way to code because your program will work regardless of the server's setting.
a We can pass the value of variables from one page to another by using the following functions without based on whether register_globals is turned on or off.

Syntax When to use it
$_GET['varname'] When the method of passing the variable is the "GET" method in HTML forms.
$_POST['varname'] When the method of passing the variable is the "POST" method in HTML forms.
$_SESSION['varname'] When the variable has been assigned the value from a particular session.
$_COOKIE['varname'] When the variable has been assigned a value from a cookie.
$_REQUEST['varname'] When it doesn't matter ($_REQUEST includes variables passed from any of the above methods)
$_SERVER['varname'] When the variable has been assigned a value from the server.
$_FILES['varname'] When the variable has been assigned a value from a file upload.
$_ENV['varname'] When the variable has been assigned a value from the operating environment.

Passing Variables Through a URL (Uniform Resource Allocate)

Example:
First File name is index.php which will send value of variables to second file.



Find my Favorite Movie


echo "href='page1.php? favoritemovie=Matrix'>";
echo "Click Here to see information about my favorite movie!";
echo "
";
?>

Second file name is page1.php will display the value of favoritemovie.



Find my Favorite Movie


echo "My Favorite Movie is :";
echo $_REQUEST['
favoritemovie'];
?>

Other examples: To send value of variables through URL
Click Here

echo "";
echo "Click Here";
echo "
";
?>

Other examples: To take value of variables from URL
My Movie Site - <?php echo $_REQUEST['favoritemovie']; ?>

echo $_REQUEST['favoritemovie'];
echo $_GET['favoritemovie'];
echo $_POST['favoritemovie'];
?>

Passing Variables with Sessions

a A session is basically a temporary set of variables that exists only until the browser has shut down.
a Unless you can set up differently in your php.ini file.
a Every session is assigned a unique session ID, which keeps all the current information together.
a Your session ID either can be passed through the URL or through the use of cookies.
a Although it is preferable for security reasons to pass the session ID through a cookie so that it is hidden from the human eye.
a If cookies are not enabled, the backup method is through the URL.
a If you would like to force the user to pass variables through cookies, you would set the following line in your php.ini. Such as, session.use_only_cookies=1
a To begin a session, use the function session_start().
a Because we assume you have register_globals set to "off", you should not use the session_register() function you may have seen in other PHP scripts.
a Make sure before using sessions that your php.ini file has been modified to show a valid path in the session.save_path variable.
a All the session information is at the top of the page, before any HTML code. This is very important. If there is even a leading space before the php code at the top of the page, you will get the error.

Exampel:
The first file: index.php
session_start();
$_SESSION['username'] = "Joe1234";
$_SESSION['authuser'] = 1;
?>


Find my favorite Movie!


$myfavorite = urlencode("Matrix");
echo "";
echo "Click Here to see information about my favorite movie!";
echo "
";
?>

The Second file: page1.php
session_start();
// check to see if user has logged in with a valid password
if ($_SESSION['authuser'] != 1) {
echo "Sorry, but you don't have permission to view this page.";
exit();
}
?>


My Favorite Movie!


echo "Welcome to our site,";
echo $_SESSION['username'];
echo "!
";
echo "My Favorite Movie is ";
echo $_REQUEST['favoritemovie'];
?>

Passing variable with Cookies

a Cookies are tiny bits of information stored on your Web site visitor's computer.
a Your visitors may either have cookies turned off or may physically delete cookies from their computers.
a The advantage to storing information in a cookie versus a session is longevity. Session can't store information for more than the length of time the browser window is opened.
a Cookies can live on a person's computer until the developer has decided it's been long enough and they automatically die.
a If your sessions are passing variables using cookies, you can set the life of these cookies to longer than the life of the browser using the session.cookie_lifetime configuration in your php.ini file.
a Like session, cookie must be placed at the very top of he page, before your first line.

Syntax:
setcookie('cookiename','value','expiration time','path','domain','secure connection');

Feature Description (Mandatory / Optional)
cookiename Cookie name is mandatory.
value Value of the cookie
expiration time Time in seconds when the cookie will expire. This time is based on a Unix timestamp, but you can set it using the syntax time()+60*60*28*365, which keeps the cookie alive for a year. This is optional, but if it is not set, the cookie will expire when the browser is closed.
path The directory where the cookie will be saved - optional.
domain Domains that may access this cookie - optional.
secure connection Whether a cookie must have a secure connection to be set (defaults to 0, to enable this feature set this to 1)

Example:

First File : index.php
setcookie('username','Jeo', time()+60 );
session_start();
$_SESSION['authuser']=1;
?>


Find my favorite Movie!


$myfavorite = urlencode("Matrix");
echo "
";
echo "Click Here to see information about my favorite movie!";
echo "
";
?>

Second file: page1.php
session_start();
// check to see if user has logged in with a valid password
if ($_SESSION['authuser'] != 1) {
echo "Sorry, but you don't have permission to view this page.";
exit();
}
?>


My Favorite Movie!


echo "Welcome to our site,";
echo $_COOKIE['username'];
echo "!
";
echo "My Favorite Movie is ";
echo $_REQUEST['favoritemovie'];
?>

Passing information with Forms

A form is made up of four parts -
1. Opening tag line, indicated by the

tag: This tag must include an action and a method. A method may be either GET or POST (however POST is preferred method because it is more secure).

2. Content of the form, including input fields: Input areas where user types in the information (or selects it in the case of a checkbox or radio button). An input field must include a type and a name. The type of input field can be one of many different selections, the most common beings:
a) Text: Used for collecting from 2 characters up to 2,000 characters.
b) Checkbox: Used to allow user to make a selection from a list of choices; also permits user to make more than one choice.
c) Radio: Used for allowing users to choose from a list, but permits only one choice.
d) Select: Used for allowing users to choose from a list.
e) Password: Hides what user is typing behind asterisks, but does not compromise the value of the variable.

3. Action button(s) or images, typically submit/clear or a user-defined button, typically considered input types as well: These are indicated with the input types submit, reset and image for user-created buttons.

4. Closing tag line, indicated with a tag.

Example:
First file: index.php -
session_unset();
?>


Please log in



Enter your name:


Enter your password:





Second file: page1.php -
session_start();
$_SESSION['username'] = $_POST['user'];
$_SESSION['userpass'] = $_POST['pass'];
$_SESSION['authuser'] = 0;

// Check username and password information

if (($_SESSION['username'] == 'sumon') and ($_SESSION['userpass'] == 'sumon' )) {
$_SESSION['authuser'] = 1;
}
else {
echo "Sorry, you have no permission to view this page!";
exit();
}
?>


Find my favorite movie!


$myfavorite = urlencode("Matrix");
echo "
";
echo "Click Here to see information about my favorite movie!";
echo "
";
?>

Third page: display.php -
session_start();
if ($_SESSION['authuser'] != 1) {
echo "Sorry, you have no permission to view this page!";
exit();
}
?>


My Favorite Movie!


echo "Welcome to our site,";
echo $_SESSION['username'];
echo "!
";
echo "My Favorite Movie is ";
echo $_REQUEST['favoritemovie'];
?>

Using if Statement

Syntax:
if (condition1 operator condition2) action to be taken if true;

Example:
if ($stockmarket >= 10000) echo "Hooray! Time to Party!";

Example: If the action to take is longer than a simple statement that will easily fit on one line.
if ($stockmarket >=10000) {
echo "Hooray! Time to Party!";
$mood = "happy";
$retirement = "Potentially obtainable";
}

Example: Here, date("n") returns a value equal to the numerical equivalent of the month as set in your server, such as 1 for January, 2 for February and so no.


Example of IF Statement


echo "The number of day of the month is ";
$month = date("n");
if ($month ==1) echo "31";
if ($month ==2) echo "28 (unless it's a leap year)";
if ($month ==3) echo "31";
if ($month ==4) echo "30";
if ($month ==5) echo "31";
if ($month ==6) echo "30";
if ($month ==7) echo "31";
if ($month ==8) echo "31";
if ($month ==9) echo "30";
if ($month ==10) echo "31";
if ($month ==11) echo "30";
if ($month ==12) echo "31";
?>

Using if-else statement

Example: Suppose, the year is 2007. That is not a leap year, so the value of $leapyear would be 0. If this is a leap year then date("L") sends the value as 1 else it sends value as 0.


Example of IF-ELSE Statement


$leapyear = date("L");
if ($leapyear == 1) echo "It is a leap year!";
else echo "Sorry, mate. No leap year this year.";
?>

Operator

Operator Appropriate Syntax
equal to ==
not equal to != or <>
greater than >
less than <
greater than or equal to >=
less than or equal to <=
equal to, AND data types match (both are integers, or both are strings) ===
not equal to, OR the data types are not the same !==

Using Includes for effective code

Example:
First File: included_file.php - which will be added to the main page.


Welcome to my movie review site


echo "Today is ";
echo date("F d");
echo ", ";
echo date("Y");
?>

Second file: main.php -


Example of file INCLUDING


included_file.php"; ?>




My Favorite Movie is : Matrix Part I, II and III


Using Functions for Efficient Code

a Functions are mini-programs within themselves.

a They don't know about any other variables around them unless you let the other variables outside the function in through a door called "global".

a Your functions can be located anywhere within your script and can be called from anywhere within your script.

a You can list all your commonly used functions at the top of your program and they can all be kept together for easier debugging. Better yet, you can put all your functions in a file and include them in your programs.

Example:
First file: index.php -
session_unset();
?>


Please log in



Enter your name:


Enter your password:





Second File: page1.php -
session_start();
$_SESSION['username'] = $_POST['user'];
$_SESSION['userpass'] = $_POST['pass'];
$_SESSION['authuser'] = 0;

// Check username and password information

if (($_SESSION['username'] == 'sumon') and ($_SESSION['userpass'] == 'sumon' )) {
$_SESSION['authuser'] = 1;
}
else {
echo "Sorry, you have no permission to view this page!";
exit();
}
?>


Find my favorite movie!


$myfavorite = urlencode("Matrix");
echo "";
echo "Click Here to see information about my favorite movie!";
echo "
";

echo "
";
echo "
";
echo "Click Here to see my top 5 movies.";
echo "
";

echo "
";
echo "
";
echo "Click Here to see my top 10 movies.";
echo "
";

?>

Second file: display.php -
session_start();
if ($_SESSION['authuser'] != 1) {
echo "Sorry, you have no permission to view this page!";
exit();
}
?>


My Favorite Movie!


echo "Welcome to our site,";
echo $_SESSION['username'];
echo "!
";

function listmovies_1()
{
echo "1. Matrix.
";
echo "2. Life of Brain.
";
echo "3. Stripes.
";
echo "4. Office Space.
";
echo "5. The Hole Grail.
";
}

function listmovies_2()
{
echo "6. Terminator 2.
";
echo "7. Star Ears.
";
echo "8. Close Encounters of the Third Kind.
";
echo "9. Sixteen Candles.
";
echo "10. Caddyshack.
";
}

if (isset($_REQUEST['myfavorite'])) {
echo "My Favorite Movie is ";
echo $_REQUEST['favoritemovie'];
}
else {
echo "My Top ";
echo $_REQUEST['movienum'];
echo " movies are :
";

listmovies_1();
if ($_REQUEST['movienum'] ==10) listmovies_2();
}
?>

Array

a Arrays are nothing more than lists of information mapped with keys and stored under one variable name. Example, you can store a person's name and address or a list of states in one variable.

Example: We can write the following table into a array.

First Name Last Name Age
Husband Albert Einstein 34
Wife Mileva Einstein 32

$husband = array("firstname"=>"Albert",
"lastname"=>"Einstein",
"age"=>34);

$wife["firstname"] = "Mileva";
$wife["lastname"] = "Einstein";
$wife["age"] = 32;
?>

Example: You can also have arrays within arrays (also known as multi-dimensional arrays).

$table1 = array("husband" => array("firstname"=>"Albert",
"lastname"=>"Einstein",
"age"=>34),
"wife" => array("firstname"=>"Mileva",
"lastname"=>"Einstein",
"age"=>32)) ;

echo $table1["husband"]["firstname"];
echo "
";
echo $table1["wife"]["firstname"];
?>

Example:

$flavor[] = "blue raspberry";
$flavor[] = "root beer";
$flavor[] = "pineapple";

echo $flavor[0]; //outputs blue raspberry
echo $flavor[1]; //outputs root beer
echo $flavor[2]; //outputs pineapple
?>

Sorting Arrays

a PHP provides many easy ways to sort array values.

Function Description
arsort(array) Sorts the array in descending value order and maintains the key/value relationship
asort(array) Sorts the array in ascending value order and maintains the key/value relationship
rsort(array) Sorts the array in descending value order
sort(array) Sorts the array in ascending value order

Example: Here print_r() is simple prints out information about a variable so that people can read it. It is frequently used to check array values, specifically.

$flavor[] = "blue raspberry";
$flavor[] = "root beer";
$flavor[] = "pineapple";

sort($flavor);
print_r($flavor);
?>

foreach Constructs

a PHP also provides a foreach command that applies a set of statements for each value in an array.

Example:

$flavor[] = "blue raspberry";
$flavor[] = "root beer";
$flavor[] = "pineapple";

echo "My favorite flavors are:
";

foreach ($flavor as $currentvalue) {
// These lines will execute as long as there is a value in $flavor
echo $currentvalue . "
\n";
}
?>

While Statement

Example: At the top of the loop, the while checks to see that the value of $num is less than or equal to 5. After five times through the loop, the value of $num is 6, so the loop ends.
$num = 1;
while ($num <= 5) {
echo $num;
echo "
";
$num = $num + 1;
}

Example: The following code works exactly the the same way, except that the condition is checked at the end of the loop. This guarantees that the conditions inside the loop will always be executed at least once.
$num = 1;
do {
echo $num;
echo "
";
$num = $num + 1;
} while ($num <=5);

echo

Example:
echo "My top ". $_POST['num'] ." movies are :
";

Alternates to the Tags

a : This must be turned on in your php.ini file with the short open tags configuration.

a <% and %>: This must be turned on in your php.ini file with the ASP tags configuration.

a : These are available without changing your php.ini file.

Alternates to the echo command

a print() command to display text or variable values in your page.

a The difference between echo() and print() is that when you use print(), a value of 1 or 0 will also be returned upon the success or failure of the print command.

Altering to Logical Operators

a && can be used in place of and, only difference being the order in which the operators is evaluated during a mathematical function.

a || can be used in place of or, only difference being the order in which the operators is evaluated during a mathematical function.

Alternates to incrementing / Decrementing Values

Syntax Shortcut What it does to the value
++$value Increases by one, and returns the incremented value.
$value++ Returns the value, then increases by one.
--$value Decreases by one and returns the decremented value.
$value-- Returns the value, then decreases by one.
$value=$value+1 Increases the value by one.
$value+=1 Increases the value by one.



Using PHP5 With MySQL

MySQL Syntax and Commands

Command Description
CREATE Creates new database or table.
ALTER Modify existing tables.
SELECT Chooses the data you want.
DELETE Erases the data from your table.
DESCRIBE Lets you know the structure and specifics of the table.
INSET INTO tablename VALUES Puts values into the table.
UPDATE Lets you modify data already in the table.
DROP Deletes an entire table or database.

More Commonly Used Functions

Functions Description
mysql_connect ("hostname", "user", "password") Connects to the MySQL Server.
mysql_select_db ("database name") Equivalent to the MySQL command USE; make the selected database the active one.
mysql_query ("query") Used to send any type of MySQL command to the server.
mysql_fetch_rows ("results variables from query") Used to return a row of the entire results of a database query.
mysql_fetch_array ("results variables from query") Used to return several rows of the entire results of a database query.
mysql_error() Show the error message that has been returned directly from the MySQL server.

Connecting to the MySQL Server

Example,
$host = "localhost";
$user = "sroyit";
$pass = "sroyitpass";
$connect = mysql_connect ($host, $user, $pass);

or

$connect = mysql_connect ("localhost", "sroyit", "sroyitpass");

Creating a Database and Table

Example:

$connect = mysql_connect ("localhost", "sroyit", "sroyitpass") or die ("Deny, check your server connection!");
$create = mysql_query ("CREATE DATABASE IF NOT EXISTS movie_site") or die(mysql_error());
mysql_select_db ("movei_site");
$movie_create = " CREATE TABLE movie (
movie_id int(11) NOT NULL auto_increment,
movie_name varchar(255) NOT NULL,
movie_type tinyint(2) NOT NULL default 0,
movie_year int(4) NOT NULL default 0,
movie_leadactor int(11) NOT NULL default 0,
movie_director int(11) NOT NULL default 0,
PRIMARY KEY (movie_id),
KEY movie_type (movie_type, movie_year) ) ";
$result = mysql_query ($movie_create) or die (mysql_error());
?>

Inserting Rows in a Created Table

Example:

$connect = mysql_connect ("localhost", "sroyit", "sroyitpass") or dia ("Deny, check your server connection!");
mysql_select_db ("movie_site");
$movie_insert = "INSERT INTO movie (movie_id, movie_name, movie_type,
movie_year, movie_leadactor, movie_director)
VALUES (1,'Sumon',5,2003,1,2),
(2,'Matrix',5,2003,1,2),
(3,'Patriot',5,2003,1,2),
(4,'Tarminator',5,2003,1,2),
(5,'Titanic',5,2003,1,2),
(7,'After the sunset',5,2003,1,2)
";
$result = mysql_query ($movie_insert) or die (mysql_error());
?>

Configuring MySQL

Testing the Installation of MySQL

C:\apache\mysql\bin>mysqld
Or
C:\apache\mysql\bin>mysqld --install
Service successfully installed

C:\apache\mysql\bin>NET START MySQL
The MySQL service was started successfully.

C:\apache\mysql\bin>mysql test
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 12 to server version: 3.23.47-nt
Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

mysql> exit
Bye

C:\apache\mysql\bin>NET STOP MySQL
The MySql service is stopping.
The MySql service was stopped successfully.

Configuring the Installation

C:\apache\mysql\bin>NET START MySQL
The MySql service is starting.
The MySql service was started successfully.


C:\apache\mysql\bin>mysql -u root
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1 to server version: 3.23.47-nt
Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

mysql> show databases;
+----------+
| Database |
+----------+
| mysql
|
| sroyit |
| test |
+----------+
3 rows in set (0.00 sec)

mysql> USE mysql;
Database changed

mysql> show tables;
+-----------------+
| Tables_in_mysql |
+-----------------+
| columns_priv |
| db |
| func |
| host |
| tables_priv |
| user |
+-----------------+
6 rows in set (0.00 sec)

Changing Password

C:\apache\mysql\bin>mysqladmin -u root reload

C:\apache\mysql\bin>mysqladmin -u root password root

C:\apache\mysql\bin>mysql -h localhost -u root -p
Enter password: ****
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 5 to server version: 3.23.47-nt
Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

A Simple Tutorial

What do I need?

In this tutorial we assume that your server has activated support for PHP and that all files ending in .php are handled by PHP. On most servers, this is the default extension for PHP files, but ask your server administrator to be sure. If your server supports PHP, then you do not need to do anything. Just create your .php files, put them in your web directory and the server will automatically parse them for you. There is no need to compile anything nor do you need to install any extra tools.

Your first PHP-enabled page

Create a file named hello.php and put it in your web server's root directory (DOCUMENT_ROOT) with the following content:



PHP Test


echo '

Hello World

'
;
?>

Use your browser to access the file with your web server's URL, ending with the "/hello.php" file reference. When developing locally this URL will be something like http://localhost/hello.php or http://127.0.0.1/hello.php but this depends on the web server's configuration. f everything is configured correctly, this file will be parsed by PHP and the following output will be sent to your browser:




PHP Test


Hello World



This program is extremely simple and you really did not need to use PHP to create a page like this. All it does is display: Hello World using the PHP echo() statement. Note that the file does not need to be executable or special in any way. The server finds out that this file needs to be interpreted by PHP because you used the ".php" extension, which the server is configured to pass on to PHP.

Make a call to the phpinfo() function and you will see a lot of useful information about your system and setup such as available predefined variables, loaded PHP modules, and configuration settings. Get system information from PHP:

(); ?>

Something Useful

We are going to check what sort of browser the visitor is using. For that, we check the user agent string the browser sends as part of the HTTP request. This information is stored in a variable. Variables always start with a dollar-sign in PHP. The variable we are interested in right now is $_SERVER['HTTP_USER_AGENT']. $_SERVER is a special reserved PHP variable that contains all web server information. It is known as an autoglobal (or superglobal).

Example 2-3. Printing a variable (Array element)

echo $_SERVER['HTTP_USER_AGENT']; ?>

A sample output of this script may be:

Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)

Introduction

What is PHP?

PHP (recursive acronym for "PHP: Hypertext Preprocessor") is a widely-used Open Source general-purpose scripting language that is especially suited for Web development and can be embedded into HTML.

Example 1-1. An introductory example


Example



echo "Hi, I'm a PHP script!";
?>


The PHP code is enclosed in special start and end tags that allow you to jump into and out of "PHP mode".

This is going to be ignored.


echo 'While this is going to be parsed.'; ?>

This will also be ignored.


What can PHP do?

Anything. PHP is mainly focused on server-side scripting, so you can do anything any other CGI program can do, such as collect form data, generate dynamic page content, or send and receive cookies. But PHP can do much more.

There are three main areas where PHP scripts are used.

  • Server-side scripting. You need three things to make this work, 1.the PHP parser (CGI or server module), 2. a webserver and 3. a web browser. You need to run the webserver, with a connected PHP installation. You can access the PHP program output with a web browser, viewing the PHP page through the server.
  • Command line scripting. You can make a PHP script to run it without any server or browser. You only need the PHP parser to use it this way. This type of usage is ideal for scripts regularly executed using cron (on *nix or Linux) or Task Scheduler (on Windows). These scripts can also be used for simple text processing tasks.
  • Writing desktop applications. PHP is probably not the very best language to create a desktop application with a graphical user interface, but if you know PHP very well, and would like to use some advanced PHP features in your client-side applications you can also use PHP-GTK to write such programs. You also have the ability to write cross-platform applications this way. PHP-GTK is an extension to PHP, not available in the main distribution. If you are interested in PHP-GTK, visit its own website.

PHP can be used on all major operating systems, including Linux, many Unix variants (including HP-UX, Solaris and OpenBSD), Microsoft Windows, Mac OS X, RISC OS, and probably others. PHP has also support for most of the web servers today. This includes Apache, Microsoft Internet Information Server, Personal Web Server, Netscape and iPlanet servers, Oreilly Website Pro server, Caudium, Xitami, OmniHTTPd, and many others. For the majority of the servers PHP has a module, for the others supporting the CGI standard, PHP can work as a CGI processor.

With PHP you are not limited to output HTML. PHP's abilities includes outputting images, PDF files and even Flash movies (using libswf and Ming) generated on the fly. You can also output easily any text, such as XHTML and any other XML file. PHP can autogenerate these files, and save them in the file system, instead of printing it out, forming a server-side cache for your dynamic content.

One of the strongest and most significant features in PHP is its support for a wide range of databases. Writing a database-enabled web page is incredibly simple. The following databases are currently supported:

Adabas D InterBase PostgreSQL
dBase FrontBase SQLite
Empress mSQL Solid
FilePro (read-only) Direct MS-SQL Sybase
Hyperwave MySQL Velocis
IBM DB2 ODBC Unix dbm
Informix Oracle (OCI7 and OCI8)
Ingres Ovrimos

We also have a database abstraction extension (named PDO) allowing you to transparently use any database supported by that extension. Additionally PHP supports ODBC, the Open Database Connection standard, so you can connect to any other database supporting this world standard.

PHP also has support for talking to other services using protocols such as LDAP, IMAP, SNMP, NNTP, POP3, HTTP, COM (on Windows) and countless others. You can also open raw network sockets and interact using any other protocol. PHP has support for the WDDX complex data exchange between virtually all Web programming languages. Talking about interconnection, PHP has support for instantiation of Java objects and using them transparently as PHP objects. You can also use our CORBA extension to access remote objects.

PHP has extremely useful text processing features, from the POSIX Extended or Perl regular expressions to parsing XML documents. For parsing and accessing XML documents, PHP 4 supports the SAX and DOM standards, and you can also use the XSLT extension to transform XML documents. PHP 5 standardizes all the XML extensions on the solid base of libxml2 and extends the feature set adding SimpleXML and XMLReader support.

At last but not least, we have many other interesting extensions, the mnoGoSearch search engine functions, the IRC Gateway functions, many compression utilities (gzip, bz2, zip), calendar conversion, translation...

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