PHP IF…ELSE

• If …else statement is an extension of simple if statement.
• When we have two different path to follow,then simple if statement cannot be useful because if provides a single path to follow.

• In such situation if…else statement is more suitable.
• If…else statement helps to perform different actions based on true or false condition.

• It has the following form:

Syntax:

if (condition)
{ 
   //true block;
}		
else				
{			
   //false block;	
}

• If given expression evaluates to true then true block will be executed and if condition is false then else block will be execute.

• In any situation only one block will be executed that is if condition is true then true block will be executed and else block will be skipped.

• Similarly, if condition is false then else block will be executed and true block will be skipped.

• When if and else statement has a single statement then brackets are not required but it is necessary when it contain two or more statements.

• The above code fragment (part) will display odd or even number depending on the condition.

Example:

<?php 
       // Program to check if number is even or odd.

  $n = 10 ;
        
  if($n % 2 == 0)
  {
     echo "Number is even" ;
  }
  else
  {
     echo "Number is odd" ;
  }
      
?>

Conditional Statement:

• Conditional statement is written using conditional operator also known as ternary operator.
• The format of the conditional operator is as follow:

(Condition)? Statement-1 : Statement-2

• It takes three operands.
• If condition is true then statement-1 will be executed otherwise statement-2 will be executed.
• We can also represent the condition for assignment operation like:

variable = (Condition)? Value-1 : Value-2

• Here if condition is true then variable has assigned the value-1 otherwise it has assigned the value-2

$sales = 70000 ;
$commission = (sales > 50000) ? 2000 : 0; // assign 2000 to commission

• In above example if sale is > 50000 then commission value will be 2000 otherwise it will be zero.

• It is similar to if…else statement and we can rewrite conditional statement using if…else statement as follow:

<?php

      if( sales > 50000)
           commission = 2000 ;
      else
           commission = 0 ;
?>