PHP Variable & Declare Variable:
In this php course we learn about php variable using algebraic terms. In algebra we use “p” “q” like these alphabets to hold different numeric values like “2” “3” . Lets Suppose we assume a formula r=p+q so we will get 5 out of this formula. Lets take this formula in php variable example.
php $p=2; $q=3; $r=$p+$q; echo $r; ?>
Above php code “$” declare the variable. php case-sensitive that’s why $P & $p is two different php variable.Keep remember in mind uppercase and lowercase alphabets not declare same variable. php variable name cannot begin with numbers.
Declare Variable:
php $name="Knowledge idea"; $data="Jhon have two tablets"; echo $name; echo $data; ?>
Note: when you appoint a text to variable so put quotes around the text. check the below highlighted example.
php $text="Put quotes around the text"; ?>
PHP is a closely language because above all examples we didn’t declare that which data type and name of the variables before to utilize it.On the other hand-side in Java,C++ a developer must declare data type.
Local & Global area variable declaration:
A variable declare outside of a function has a global area and can accessed only outside of this function. A variable declare Inside of a function has a Local area and can accessed only Inside of this function. Lets take an example both areas.
php $p=2; //Global Area & it access only outside of area function take demo() { $q=3; //Local Area & it access only inside of area echo "demo variable inside the function"; echo "Variable of $q"; echo ; echo "Variable of $p"; } take demo() echo "demo variable outside the function"; echo "Variable of $p"; echo ; echo "Variable of $q"; ?>
Above line”6″ highlighted shows Local Area/scope.Second below line”12″ shows global Area/scope. Grab these above codes and try it yourself !!