switch case in php

switch statement in php
• We use switch statement when we need to execute one code block among many blocks according to the value of a variable/expression.
• We can do the same thing with if else ladder, but, syntax of switch statement is easier to read and write from the point of view of the programmer.
• Generally switch case statement is used in menu driven programming, where we choose an option from available multiple options.
Syntax of switch case
switch (expression)
{ case constant1:
// statements
break;
case constant2:
// statements
break;
default:
// default statements
}
How does the switch statement work?
• The switched expression is evaluated first then its value is compared with the value of each case one by one.
• If there is a match, the statements of that case are executed. For example, if the value of the expression is equal to the value of case constant2, statements of case constant2.
• If there is no match, the default statements are executed.
• If we do not use break, all statements after the matching label are executed.
• The default clause inside the switch statement is optional and can be used anywhere inside the switch, but we use break if it is used at any other place except the end of switch.
• The case values may be of any datatype, and they may be duplicate and variable also in PHP.