- Addition (+)
Addition is performed with the "+" symbol.
Ex:
$total = 5 + 6;
Here 5 add to 6 and assign to the total variable
- Subtract (-)
Subtract is performed with the "-" symbol.
Ex:
$answer = 8 - 6;
- Multiplication (*)
Multiplication is performed with the "*" symbol.
Ex:
$answer = 5 * 6;
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PHP - Arithmetic Operations
PHP - Variables and Data types
What is a Variable?
Variables are used to store values into the system's memory. Variables allows to perform set of actions and can be re-use within the code. You can change the out put of the program by changing the variable values rather changing the script.
Data Types
String : used for character values such as sentences, names stc
Integer : used to store numeric values of whole numbers
Float : used to store numeric values of real numbers
Boolean: used to store either true or false or 1 or 0
Object : used to store collection of values (data) or methods
Important: PHP is loosely typed language, that means your script determines the data type of the variable.
Ex:
$val = "PHP Programming" // This is considering as String Value
$val = 50 // This is considering as Integer Value
$val = "100" //This is considering as String value
$val = $val * 5 // This is considering as Integer value
$val = $val * 1.25 //This is considering as float value
PHP - Embeded HTML
This post desribe about the PHP scripting, html coding and embedded php scripts.
I'll explain those with an example.
<html>
<head>
<title>Embedded php</title>
</head>
<body>
<hr />
<h3>Embedded php</h3>
<p>This is a regular HTML paragraph</p>
<?php
echo "<p>This is a php paragraph</p>";
?>
<hr />
</body>
</html>
Above code displays following output.
This is a php paragraph.
I'll explain those with an example.
<html>
<head>
<title>Embedded php</title>
</head>
<body>
<hr />
<h3>Embedded php</h3>
<p>This is a regular HTML paragraph</p>
<?php
echo "<p>This is a php paragraph</p>";
?>
<hr />
</body>
</html>
You can see the text inside the php script and out side it. Text inside the php script (comes with echo statement) handled as a script and rest of the text rendered as regular HTML. We can include any no of php blocks inside the html document like java script and any html tag to embedded the code.
Embedded php
This is a regular HTML paragraphThis is a php paragraph.
PHP - Install a Web Server
- Wamp Server
This video instruct you how to install wamp server - Xampp server
This video instruct you how to setup xampp server on linux (Fedora)
PHP - My First PHP Program
This is a basic php embeded HTML program.
<?php
echo "<h3>Hello This is my First PHP Program </h3>";
?>
<?php
print ("<h3>Hello This is my First PHP Program </h3>");
?>
According to the above program you can appear Following out put
<?php
echo "<h3>Hello This is my First PHP Program </h3>";
?>
<?php
print ("<h3>Hello This is my First PHP Program </h3>");
?>
According to the above program you can appear Following out put
Hello This is my First PHP Program
- echo and print statements are use to write something in the browser. Within the echo statement we can use html tags to format the text.
PHP - Comments
There are 02 comments used with PHP scripts.
- Single line Comment
Single line comments can be specified by //
Ex:
<?php
// This script print Hello World in the browser
echo "Hello World"
?> - Multiple line Comment
Multiple Line Comment begins with "/*" and ends with */.
Ex:
<?php
/* This is a multiple line comment You can comment
any no of lines within this block
*/
echo "Hello World"
?>
PHP - How to create php files
Normally PHP script block starts with <?php and ends ?> and it can be embedded with HTML. PHP block can be placed anywhere in the document either with html tags or not.
HTML Embeded php code
<html>
<head>
<title>This is my First PHP Program</title>
</head>
<body>
<?php
echo "This is my First PHP Program";
?>
</body>
</html>
Pure PHP Code
<?php
echo "This is my First PHP Program";
?>
Shorthand PHP Code
Following code executed when the shorthand mood enabled in the server.
<? echo "This is my First PHP Program"; ?>
It is necessary to specify extention of the php file name as ".php" other wise php scrip does not execute.
Ex: Hello.php
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