Sunday, March 24, 2013

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.









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