switch (n)
{
case label 1:
code to be executed if n=labeI1;
break;
case label 2:
code to be executed if n=labeI2;
break;
case label 3:
code to be executed if n=labeI3;
break;
...
default:
code to be executed if n is different from all labels;
}

The if ... else statement is a conditional statement in PHP. It executes one block of code if a condition is true and another block of code if the condition is false.

Syntax:
if (condition)
{
  //code to be executed if condition is true;
}

There are several types of conditional statements in PHP. They are
1. 'if' statement
2. 'if...else' statement
3. 'if...elseif...else' statement
4. 'switch' statement

< ?php
＄x = "August";
if (＄x == "January'') {
echo "Happy Republic Day";
}
elseif (＄x == "August'') {
echo "Happy Independence Day!!!";
}
else{
echo "Nothing to show";
}
? >

< ?php
＄x = -12;
if (＄x > 0)
{
echo "The number is positive";
}
else{
echo "The number is negative";
}
? >

(i) Conditional statements are useful for writing decision making logics. It is the most important feature of many programming languages, including PHP.
(ii) When we write the code for conditional statements very often, we can perform different actions for different decisions in different business logic.

< ?php
＄n = "February";
switch(＄n) {
case "January":
echo "Its January";
break;
case "February":
echo "Its February";
break;
case "March":
echo "Its- March";
break;
case "April":
echo "Its April";
break;
case "May":
echo "Its May";
break;
case "June":
echo "Its June";
break;
case "July":
echo "Its July";
break;
case "August":
echo "Its August";
break;
case "September":
echo "Its September";
break;
case "October":
echo "Its October";
break;
case "November":
echo "Its November";
break;
case "December":
echo "Its December";
break;
default:
echo "Doesn't exist";
}
? >

< ?php
＄today=date("D'') ;
switch(＄today)
{
case"Mon":
echo"Today is Monday. ";
break;
case''Tue'':
echo''Today is Tuesday.";
break;
case''Wed'':
echo''Today is Wednesday.";
break;
case''Thu'':echo''Today is Thursday.";
break;
case"Fri":
echo''Today is Friday. Party tonight.";
break;
case"Sat":echo''Today is Saturday.";
break;
case"Sun":
echo''Today is Sunday.";
break;
default:
echo"No information available for that day.";
break;
}
? >

If else statement in PHP:
If statement executes a statement or a group of statements if a specific condition is satisfied by the user expectation. When the condition gets false (fail) the else block is executed.
Syntax:
if (condition)
{
Execute statement(s) if condition is true;
}
else
{
Execute statement(s) if condition is false;
}
Example
＄Pass_Mark=35;
＄Student_Mark= 70;
if (＄Student_Mark>= ＄Pass_Mark){
echo "The Student is eligible for the promotion";
}
else {
echo "The Student is not eligible for the promotion";
} ?>

If elseif else statement in PHP:
If-elseif-else statement is a combination of if-else statement. More than one statement can execute the condition based on user needs.
Syntax:
if (1^st condition)
{
Execute statement(s) if condition is true;
}
elseif(2^nd condition)
{
Execute statement(s) if 2^nd condition is true;
}
else
{
Execute statement(s) if both conditions are false;
}
Example Program:
＄Pass_Mark=35;
＄first_class=60;
＄Student_Mark= 70;
if (＄Student_Mark > = ＄first_ class){
echo "The Student is eligible for the promotion with First Class";
}
elseif (＄Student_Mark >= ＄Pass_Mark){
echo "The Student is eligible for the promotion";
}
else {
echo "The Student is not eligible for the promotion";
} ?>