How to Define a Variable in PHP
Over the last few years, PHP has become the de facto choice for the development of data-driven Web applications, notably on account of its scalability, ease of use, and widespread support for different databases and data formats.
This first chapter will gently introduce you to the world of PHP, by taking you on a whirlwind tour of PHP’s history and features, and then guiding you through writing and executing your first PHP program So flip the page, and let’s get Started.The fresher students can learn coding and designing by Php Development company
What is Variable?
Variable is nothing it's simply name of the memory location.
A Variable is just a instrumentality i.e wont to store each numeric and non-numeric info.
Rules For Variable Declaration
- Variables in PHP starts with a dollar($) sign, followed by the name of the variable.
- The variable name should begin with a letter or the underscore character.
- A variable name will solely contain alpha-numeric characters and underscores (A-z, 0-9, and _ )
- A variable name shouldn't contain house
- Assigning Values To Variables
- Assigning a worth to a variable in PHP is kind of east: use the equality(=) image, that additionally to the PHP’s assignment operators.
- This assign price on the correct facet of the equation to the variable on the left.
- A variable is made the instant you assign a worth to it:
Example
<?php
$Car ="Ford";
echo $Car
?>
PHP Concatenation
Example
<?php
$car="Ford Car";
echo $car."is riding";
?>
Sum of two numbers
<?php
$a=100;
$b=200
$c=$a+$b;
echo "sum=".$c;
?>
Destroying PHP Variables
To destroy a variable, pass the variable to PHP’s unset( ) function.
as in the following example:
Eg
$name="steve";
echo $name;
//unset( ) function destroy the variable reference.
unset($name);
?>
Variable Names In PHP Are Case-Sensitive
<?php
$name="rexx";
$NAME="rahul";
echo $name."<br/>";
echo $NAME;
?>
Difference Between $Var And $$Var In PHP
PHP $$var uses the value of the variable whose name is the value of $var.
It means $$var is known as reference variable where as $var is normal variable.
It allows you to have a “variable’s variable” – the program can create the variable name the same way it can create any other string.
Example
<?php
$name="Rajeev";
$$name="Sanjeev";
echo $name."<br/>";
echo $$name."<br/>";
echo $Rajeev;
?>
$$name is reference variable . $$name uses the value of the variable whose name is the value of $name.
echo $name print the value: Rajeev
echo $$name print the value:Sanjeev \ value of this($name) variable is act as reference of second variable($$name).
echo $rajeev print the value :Sanjeev \ Here $Rajeev is also act as reference variable.
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