Php

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What is PHP?
• PHP is an acronym for “Hypertext Preprocessor”
• PHP is a server scripting language, and a powerful tool for making dynamic
and interactive Web pages.
• PHP can be embedded into HTML
• PHP files have extension ".php"

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Other server side technologies
1. ASP (Active Server Pages):
• This was Microsoft’s first server-side technology
• ASP programming code is interpreted at run time, hence it can be slow in comparison to other
technologies.
2. ASP.NET :
• This replaced Microsoft’s older ASP technology
• It is essentially limited to Windows servers
3. JSP (Java Server Pages)
4. Node.js
5. Perl
6. PHP
7. Python
8. Ruby on Rail

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How server script will executes?

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Sever scripts have access to many resources
like

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• 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 add, delete, modify data in your database
What Can PHP Do?

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• 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 easy to learn and runs efficiently on the server side
Why PHP?

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Market share of web development environments

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• XAMPP or WAMP for Windows
• LAMP for Linux
• MAMP for Mac
Servers on various platforms
Installing XAMPP on Windows
You can download from this link
https://www.apachefriends.org/download.html

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• A PHP script can be placed anywhere in the document.
• A PHP script starts with <?php and ends with ?>
<?php
// PHP code goes here
?>
• The default file extension for PHP files is ".php".
• A PHP file normally contains HTML tags, and some PHP scripting code.
Basic PHP Syntax

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<html>
<body>
<h1>My first PHP page</h1>
<?php
echo "Hello World!";
?>
</body>
</html>
First PHP script

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In PHP, a variable starts with the $ sign, followed by the name of the
variable
<?php
$txt = “CIT”;
$x = 5;
$y = 10.5;
?>
Creating (Declaring) PHP Variables

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Output Variables
• In PHP, there are 2 basic ways to get output: echo and print
• Small difference is echo has no return value and print has a return
value of 1.
<?php
$txt = “CIT";
$x = 5;
$y = 10.5;
echo "I love $txt!";
echo $x + $y;
?>

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1. PHP String:
A string is a sequence of characters
<!DOCTYPE html>
<html>
<body>
<?php
$x = “CIT”;
$y = ‘CIT';
echo $x;
echo "<br>";
echo $y;
?>
</body>
</html>
PHP data types

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2. PHP Integer:
An integer data type is a non-decimal number between -2,147,483,648 and 2,147,483,647.
Rules for integers:
• An integer must have at least one digit
• An integer must not have a decimal point
• An integer can be either positive or negative
<!DOCTYPE html>
<html>
<body>
<?php
$x = 2018;
echo $x;
var_dump($x); //var_dump() function returns the data type and value
?>
</body>
</html>

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3. PHP Float:
A float (floating point number) is a number with a decimal point or a number in
exponential
<!DOCTYPE html>
<html>
<body>
<?php
$x = 3.142;
echo $x;
var_dump($x); //var_dump() function returns the data type and value
?>
</body>
</html>

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4. PHP Array:
An array stores multiple values in one single variable.
<!DOCTYPE html>
<html>
<body>
<?php
$cars = array("Volvo","BMW","Toyota");
var_dump($cars);
?>
</body>
</html>

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PHP Conditional Statements
PHP - The if Statement:
The if statement executes some code if one condition is true.
Syntax
if (condition)
{
//code to be executed if condition is true;
}
Example
<?php
$t = date(“h");
if ($t < “10") {
echo "Have a good day!";
}
?>

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PHP - The if else Statement:
The if else statement executes some code if a condition is true and another code if
that condition is false.
Syntax
if (condition)
{
code to be executed if condition is true;
}
else
{
code to be executed if condition is false;
}
Example
<?php
$t = date("H");
if ($t < "20")
{
}
else
{
echo "Have a good night!";
}
?>

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PHP - The if elseif else Statement:
It executes different codes for more than two conditions.
Syntax
if (condition)
{
code to be executed if this condition is true;
}
elseif (condition)
{
code to be executed if this condition is true;
}
else
{
code to be executed if all conditions are false;
}
Example
<?php
$t = date("H");
if ($t < "10")
{
echo "Have a good morning!";
}
elseif ($t < "20")
{
}
else
{
echo "Have a good night!";
}
?>

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The for loop is used when you know in advance how many times the script should
run.
PHP for Loops
Syntax
for (init counter; test counter; increment counter)
{
code to be executed;
}
Example
<?php
for ($i = 0; $i <= 10; $i++) {
echo "The number is: $i <br>";
}
?>

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PHP Form Handling
Welcome.html
<html>
<body>
<form action="welcome.php" method="post">
Name : <input type="text" name="name"><br>
E-mail : <input type="text" name="email"><br>
<input type="submit">
</form>
</body>
</html>
welcome.php
<!DOCTYPE HTML>
<html>
<body>
<?php echo "Welcome ".$_POST["name"]; ?><br>
<?php echo "Your email address is
".$_POST["email"]; ?>
</body>
</html>

Php

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