GET Variable

The $_GET Variable

The predefined $_GET variable is used to collect values in a form with method="get"
Information sent from a form with the GET method is visible to everyone (it will be displayed in the browser's address bar) and has limits on the amount of information to send.

// A Simple program to use GET Variable

The "welcom.php" file can now use the $_GET variable to collect form data (the names of the form fields will automatically be the keys in the $_GET array):

Static Variable

When a function is completed, all of its variables are normally deleted. 

However, sometimes you want a local variable to not be deleted.

To do this, use the 'static' keyword when you first declare the variable

The Output will be shown as:
123

So,each time the function is called, that variable will still have the information it contained from the last time the function was called.

PHP Concatenation Operator

The concatenation operator (.)  is used to join two string values together.

 The following example show how two string are concatenated.

The result will be shown as :

getcoderesults 

If we need space between two strings then we use two concat operator between two strings

&lt?php

echo "hello friends";

?>

strlen() function

We know the length of a string value in PHP.
 
The strlen() function returns the length of a string, in characters.

The following example show the use of strlen()

The result is shown:
15

strpos() function

The strpos() function is used to search for a character or a specific text within a string.

If a match is found, it will return the character position of the first match. 

If no match is found, it will return nothing.


The following example how to use a strpos():

 The result is come:

24




If the word is not present in the string, then no output will be displayed:

<?php
echo 'hello world';
?>

Variable Declaration

Variables are "containers" for storing information. Variables are represented '$' symbol in the PHP language.

A variable starts with the $ sign, followed by the name of the variable

A variable name must begin with a letter or the underscore character

A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ )

A variable name should not contain spaces

Variable names are case sensitive ($y and $Y are two different variables)

The result is =11;

General Introduction

PHP is a server scripting language, and is a powerful tool for making dynamic and interactive Web pages.

PHP stands for PHP: Hypertext Preprocessor.It is a widely-used, open source scripting language.
Its scripts are executed on the server. It is free to download and use.

To start using PHP, we have:
 install a web server
 a web host with PHP and MySQL support.
Install a web server on your own PC, and then install PHP and MySQL

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".

Each code line in PHP must end with a semicolon. 
The semicolon is a separator and is used to distinguish one set of instructions from another.

Introduction

PHP is a server scripting language, and is a powerful tool for making dynamic and interactive Web pages.

PHP stands for PHP: Hypertext Preprocessor

PHP is a widely-used, open source scripting language

PHP scripts are executed on the server

PHP is free to download and use.

PHP is a server scripting language, and a powerful tool for making dynamic and interactive 

Web pages.

PHP is a widely-used, free, and efficient alternative to competitors such as Microsoft's ASP.