Declare Variable
Declare Variable:
Variables are the temporary storage. Or Variable store the values or variable are container they contain the values the value is depend upon the user it may be string may be integer etc.
How to declare variable in php?
Syntax:
$variable _name=value;
$stu_name=”arsh”; // this is the variable name with stu_name and the value is arsh which is in string.
There are some rules for declare the variables:-
variable are case sensitive
$Name and $name is deferent.
Blank spaces are not allowed. we can use (_) underscore at the place of blank space.
Eg.
$student name=”amrit pal”; // is wrong variable name can’t accept the blank space
but value can accept the blank space.
$student_name=”amrit pal”; // is the right way to declare a variable with space.
Variable not start with number or special character.
Eg.
$22=value;
$#=value; // wrong way
$name=value; //right way
A personal advice to declare a variable is give the relative name to the variable that we can easy understand and easy operate.don’t use the shortcut names like $a,$b etc .
How to access the variable??
Now we know how we can declare the variable now how can access that variable.
We can operate on the variables using the operator we can store some output and display them as result or output.
Variable use with operators:-
$first_value=10; //declare variable
$second_value=20; //declare variable
$result=$first_value+$second_value; // works with operators
Or
$result=$first_value*$second_value;
How to show the result and concatenate with the string :-
Echo $result; // it show the simple result and produce the output only
Echo “result is: ”.$result; // it show the result with string result
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