Variables in PHP
—Variable is nothing it is just name of the memory location.
—Variable is nothing it is just name of the memory location.
—A Variable is simply a container i.e used to store both
numeric and non-numeric information.
Rules
for declaring Variable:
—Variables in PHP starts with a dollar($) sign, followed by the name of the variable.
—The 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
Creating (Declaring) PHP Variables
A variable is created
the moment you assign a value to it:
Example:
<?php
$myCar = "Honda";
echo $myCar;
?>
Output : Honda
In
the above example:
—Create a variable ($mycar)containing a string with value=”Honda”.
—To print the carname pass $mycar inside echo statement.
Concatenation variable with string
<?php
$myCar = "Honda
City";
echo $myCar." is
riding";
?>
Output: Honda
City is riding
In the above example
Variable($mycar) hold value=”honda city”. Now we wants to concatenate variable with string.
pass this variable($mycar) inside echo statement.
To concatenate this with a string(“is riding”) use dot(.) between variable name and string.
The output will be displayed : Honda City is riding
Variable($mycar) hold value=”honda city”. Now we wants to concatenate variable with string.
pass this variable($mycar) inside echo statement.
To concatenate this with a string(“is riding”) use dot(.) between variable name and string.
The output will be displayed : Honda City is riding
Sum of two numbers
<?php
$first = 100;
$second = 200;
$third = $first + $second;
echo "Sum =
".$third;
?>
Output: Sum =
300
In the above example
Declare $first , $second variable with value=100, 200 respectively.
Now add these two numbers using arithmetic operator (“+”).
sum of these two variable result stored in a third variable($sum).
Now print the sum passing ($third) with echo statement with a string.
Declare $first , $second variable with value=100, 200 respectively.
Now add these two numbers using arithmetic operator (“+”).
sum of these two variable result stored in a third variable($sum).
Now print the sum passing ($third) with echo statement with a string.
Check Variable Contents(what data type PHP variables contain)
For String value
<?php
$myCar = "Honda
City";
var_dump ($myCar);
?>
Output : string
'Honda City' (length=10)
In the above example
We use var_dump( ) function to check the Contents(property) of variable, $mycar hold value =”Honda City”.
Now pass this variable inside var_dump($mycar) function .
It show all information related this(data type of variable, length(only string), value)
We use var_dump( ) function to check the Contents(property) of variable, $mycar hold value =”Honda City”.
Now pass this variable inside var_dump($mycar) function .
It show all information related this(data type of variable, length(only string), value)
For Integer values
<?php
$first = 100;
$second = 200;
$third = $first + $second;
var_dump ($third);
?>
Output : int 300
For Boolean value
<?php
$bool = true;
var_dump ($bool);
?>
Output : Boolean true
In
the above variable
$bool with value=”true”. var_dump($bool) function is used to display the result
so output will display Boolean true, because variable holds a Boolean value
$bool with value=”true”. var_dump($bool) function is used to display the result
so output will display Boolean true, because variable holds a Boolean value
For Floating value
<?php
$first = 100.5;
$second = 200.2;
$third = $first + $second;
var_dump ($third);
?>
Output : float 300.7
In
the above example
variables first hold $first=100.5, second hold $second=200.2.
Now add these two values, result is stored in third variable($third).
Pass this variable inside var_dump($third) to check the content.
output will float 300.7
variables first hold $first=100.5, second hold $second=200.2.
Now add these two values, result is stored in third variable($third).
Pass this variable inside var_dump($third) to check the content.
output will float 300.7