PHP Hypertext Preprocessor
adeel990
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34 slides
May 30, 2016
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About This Presentation
Basic Knowledge of PHP, its Syntax, Data types, Operations, Validation, MySQL Database Connection and other different Methods
Slide Content
By: MUHAMMAD ADEEEL
What is PHP ? The PHP Hypertext Preprocessor (PHP -- yes, the first "P" in the acronym does indeed stand for PHP!) Allows web developers to create dynamic content that interacts with databases . PHP is a widely-used, free, and efficient alternative to competitors such as Microsoft's ASP.
PHP is a widely-used, open source scripting language PHP scripts are executed on the server PHP is free to download and use PHP can generate dynamic page content PHP can create, open, read, write, delete, and close files on the server PHP can collect form data PHP can send and receive cookies PHP can add, delete, modify data in your database PHP can be used to control user-access PHP can encrypt data What is PHP?
PHP runs on various platforms (Windows, Linux, Unix, Mac OS X, etc .) PHP is compatible with almost all servers used today (Apache, IIS, etc .) PHP supports a wide range of databases PHP is free. Download it from the official PHP resource: www.php.net PHP is easy to learn and runs efficiently on the server side What is PHP?
You have to Learn Before PHP
Development started in 1994, by Rasmus Lerdorf . PHP originally abbreviation for ‘ Personal Home Pages ’, now ‘PHP Hypertext Preprocessor ’ Open Source Server-side Scripting(executes on Server.) Used to make web application HTML-embedded scripting language Cross-platform Main Features of PHP Simpler and faster to develop applications Interpreted Language Loosely typed language PHP is compatible with almost all servers used today (Apache, IIS, etc.) PHP Support Many Databases like ( Mysql ,SQL Server ,Oracle)
Light-weight Cross-platform compatible Procedural / Object Oriented programming Supports wide range of Databases Supports wide variety of outputs Open source Advantages of PHP
PHP Software A Web Server (Apache , IIS) An RDBMS (DATABASE Software) (MYSQL) What We Need For PHP ?
There Are Different Development Packages available for PHP. (Package:- collection Of Software's.) These Are Some Development Packages:- XAMPP Server WAMP Server LAMP Server MAMP Server SAMP Server How to Install PHP ?
For XAMPP Apache visit: https:// www.apachefriends.org/download.html How to Install Web Servers
XAMPP ( X Cross Platform ) Provide APACHE , MYSQL , PHP , PERAL WAMP ( W Windows ) Provide APACHE , MYSQL , PHP LAMP ( L LINUX ) MAMP ( M Macintosh ) SAMP ( S Sun Solaris ) Web Development Packages
written in the C programming language Rasmus Lerdorf in 1994 for use in monitoring his online resume and related personal information. For this reason, PHP originally stood for " Personal Home Page " B ecause php libraries are already compiled and processed. P erson request any php page in browser address bar that request first go to server for example Apache is running on that server. S erver interpret php files and return back response in form of HTML
Most software we use have been compiled. This means that its computer code has been put through an application that translates it into a form your computer can understand. After a program has been compiled, it's nearly impossible to modify it or see exactly how it was created. Open source software includes the source code along with the compiled code. People who write open source software actually encourage others to customize it Cross-platform software can run on most or all systems with little or no modification
Not limited to output HTML. Abilities includes outputting images PDF files and even Flash movies You can also output easily any text, such as XHTML and any other XML file. OUTPUT
Basic Syntax <? php // PHP code goes here ?>
Basic Syntax < !DOCTYPE html > < html > < body > < h1 > My first PHP page < /h1 > <? php echo "Hello World!" ; ?> < /body > < /html > PHP Code will include in <Body> Tag
In PHP, a variable starts with the $ sign, followed by the name of the variable. PHP has three different variable scopes: local global Static PHP Variables < !DOCTYPE html > < html > < body > <? php $txt = "W3Schools.com" ; echo "I love " . $txt . "!" ; ?> < /body > < /html >
echo and print are more or less the same. They are both used to output data to the screen. The differences are small: echo has no return value while print has a return value of 1 so it can be used in expressions. echo can take multiple parameters (although such usage is rare) while print can take one argument. echo is marginally faster than print. PHP echo & Print Statements <? php echo "<h2>PHP is Fun!</h2>" ; echo "Hello world!< br >" ; echo "I'm about to learn PHP!< br >" ; echo "This " , "string " , "was " , "made " , "with multiple parameters." ; ?>
PHP supports the following data types: String Integer Float (floating point numbers - also called double) Boolean Array Object NULL Resource PHP Data Types
Operators are used to perform operations on variables and values. PHP divides the operators in the following groups: Arithmetic operators Assignment operators Comparison operators Increment/Decrement operators Logical operators String operators Array operators PHP Operators
A function name can start with a letter or underscore (not a number). PHP Functions <? php function familyName ($ fname ) { echo "$ fname Refsnes .< br >" ; } familyName ( " Jani " ); familyName ( " Hege " ); familyName ( "Stale" ); familyName ( "Kai Jim" ); familyName ( " Borge " ); ?>
The PHP superglobals $_GET and $_POST are used to collect form-data. PHP Form Handling <html> <body> Welcome <? php echo $_GET["name"]; ?>< br > Your email address is: <? php echo $_GET["email"]; ?> </body> </html> <html> <body> Welcome <? php echo $_POST["name"]; ?>< br > Your email address is: <? php echo $_POST["email"]; ?> </body> </html>
Both GET and POST create an array $_GET is an array of variables passed to the current script via the URL parameters. $_POST is an array of variables passed to the current script via the HTTP POST method. Information sent from a form with the GET method is visible to everyone. Information sent from a form with the POST method is invisible to others. GET VS POST
to open files is with the fopen () function . The fread () function reads from an open file . The fclose () function is used to close an open file . The fgets () function is used to read a single line from a file. The feof () function checks if the "end-of-file" (EOF) has been reached. The fgetc () function is used to read a single character from a file . PHP File Open/Read/Close <? php $ myfile = fopen ("webdictionary.txt", "r"); // some code to be executed.... fclose ($ myfile ); ?>
The fopen () function is also used to create a file . The fwrite () function is used to write to a file . The first parameter of fwrite () contains the name of the file to write to and the second parameter is the string to be written. PHP File Create/Write
Several predefined variables in PHP are " superglobals ", which means that they are always accessible, regardless of scope - and you can access them from any function, class or file without having to do anything special. The PHP superglobal variables are: $GLOBALS $_SERVER $_REQUEST $_POST $_GET $_FILES $_ENV $_COOKIE $_SESSION PHP Superglobal
A cookie is often used to identify a user. A cookie is a small file that the server embeds on the user's computer. Each time the same computer requests a page with a browser, it will send the cookie too. With PHP, you can both create and retrieve cookie values . A cookie is created with the setcookie () function. PHP Cookie <? php $ cookie_name = "user" ; $ cookie_value = "John Doe" ; setcookie ($ cookie_name , $ cookie_value , time() + ( 86400 * 30 ), "/" ); // 86400 = 1 day ?> < html > < body > <? php if (! isset ( $_COOKIE [$ cookie_name ])) { echo "Cookie named '" . $ cookie_name . "' is not set!" ; } else { echo "Cookie '" . $ cookie_name . "' is set!< br >" ; echo "Value is: " . $_COOKIE [$ cookie_name ]; } ?> < /body > < /html >
A session is a way to store information (in variables) to be used across multiple pages A session is started with the session_start () function. Session variables are set with the PHP global variable: $_SESSION. PHP Sessions <? php // Start the session session_start (); ?> < !DOCTYPE html > < html > < body > <? php // Set session variables $_SESSION [ " favcolor " ] = "green" ; $_SESSION [ " favanimal " ] = "cat" ; echo "Session variables are set." ; ?> < /body > < /html >
PHP 5 and later can work with a MySQL database using : MySQLi extension (the " i " stands for improved) PDO (PHP Data Objects ) PDO will work on 12 different database systems, where as MySQLi will only work with MySQL databases. How to Connect PHP with MySQL Database.
For MySQLi Installation go to: http:// php.net/manual/en/mysqli.installation.php For PDO Installation go to: http :// php.net/manual/en/pdo.installation.php How to Connect PHP with MySQL Database (cont.)
Connect with MySQLi <? php $ servername = " localhost " ; $username = "username" ; $password = "password" ; // Create connection $conn = new mysqli ($ servername , $username, $password); // Check connection if ($conn-> connect_error ) { die ( "Connection failed: " . $conn-> connect_error ); } echo "Connected successfully" ; ?>
Connect with PDO <? php $ servername = " localhost " ; $username = "username" ; $password = "password" ; // Create connection $conn = mysqli_connect ($ servername , $username, $password); // Check connection if (!$conn) { die ( "Connection failed: " . mysqli_connect_error ()); } echo "Connected successfully" ; ?>
Thank You…..
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