PHP Basic -> Variables

What is variable?
Variable are the container of information. Variable can store many type of  information like string, number, array, object etc.


Following are the rules for PHP variables:

•     A variable starts with the $ sign, followed by the name of the variable
•     A variable name must begin with a letter(A-Z) 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 ($a and $A are two different variable)

Following are the example of different type of variables

/** Variable store number**/
$a=10;
$b=12;
var_dump($a);
var_dump($b);
/** Variable store number**/

/** Variable store string**/
$name='Arun';
var_dump($name);
/** Variable store string**/

     
/** Variable store array**/
$dataTypes = array('Int','String','Array','Object');
var_dump($dataTypes);
/** Variable store array**/

/** Variable store Object**/
class ABC{
}
$obj = new ABC();
var_dump($obj);     
 /** Variable store Object**/

Following things keep in mind regarding this topic(Minimum)

• Whar are PHP Variables and their use. 
• What are different types of variable like Array, Object and String etc
• Manipulation of varaibles
• Global, Static, local variables and their scope 
• Dynamic varaibles
• Session variables and server variables
• Manipulation of variables.