Php

PHPHypertext Preprocessor
By : Ammar khan

Index
 What is PHP ?
 Why use PHP ?
 What can PHP do ?
 PHP Syntax
 Tools Required
 Practical work

What is PHP
 PHP ( Hypertext Preprocessor ) is a general-purpose programming
language originally designed for web development.
 PHP is a server side scripting language. that is used to develop Static
websites or Dynamic websites or Web applications.
 78.9% of whole web. Every 8 websites out of 10 are using PHP in on or
other way.
 An PHP file can consist of HTML, CSS, JAVASCRIPT and of course PHP.
 Facebook , Wikipedia , Flicker, Tumbler And Yahoo are some global
companies using PHP in their products.

Why use PHP ?
 Security PHP frameworks built-in feature and tools make it easier to
protect the web applications from the outer attacks and security threats.
 High Speed PHP is very fast programming language because it uses its
own memory for processing.
 Scalability PHP is very flexible and capable language it can handle from
a “Hello World “ app to a Facebook size project.
 Loosely Typed Language PHP is loosely typed language and best for
beginners
 Open Source PHP is an open source it doesn’t require any additional
expensive software to work with.

What can PHP do
 PHP can generate dynamic page content
 PHP can create , open , read, delete and close files on server
 PHP can collect form data
 PHP can add, delete, modify and retrieve data in database.

Our Usage
PHP
KOTLIN
JavaScript
Others

Basic syntax
 A PHP script can be placed anywhere in the document.
 A PHP script starts with <?php and ends with ?>

Basic Syntax
<HTML>
<head>
<title> I am title </title>
</head>
<body>
<h1>
Hello <?php $_GET[“user_name”] ?>
</h1>
</body>
</HTML>

Frequently used functions
 Echo
 isset()
 Loops (for, while)
 Conditional statements (if else)
 mysqli_connect()
 mysqli_query()

Echo
<?php echo” Hello world ”; ?>
Echo function is a powerful and basic function of PHP . It could be used at
different places for different purposes. Following are some basic features
of echo function.
 Out put one or more strings
 Can output HTML , CSS and JavaScript content
 Used to create dynamic content

Isset()
<?php
$name=’Ammar’;
if(isset($name){
echo”variable found”;
}
?>
 The isset () function is used to check whether a variable is set or not.
 If a variable is already unset with unset() function, it will no longer be
set.
 The isset() function return false if testing variable contains a NULL value.

Loops (for, while)
<?php
for($i=1; $i<=3; $i++ ){
echo "The number is " . $i . "<br>";
}
?>
For loop
While loop
<?php
$i=1;
while( $i<=3){
$i++ ;
echo "The number is " . $i . "<br>";
}
?>

Conditional Statement (if else)
<?php
$marks=40;
if($marks > 40 ){
echo "You are pass ";
}
else{
echo "You are fail ";
}
?>

mysqli_connect()
<?php
$host=”localhost”;
$user=”root”;
$password=””;
$db=”my_database”;
$conn=mysqli_connect($host,$user,$password,$db);
?>
The mysqli_connect() function opens a new connection to the MySQL server.

mysqli_query()
<?php
$query=”SELECT * FROM user where user_id=1”;
$do_query=mysqli_query($conn,$query);
If(!$do_query){
echo “query failed”;
}
?>
The mysqli_query() function performs a query against the database.

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