if else in php

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PHP uses if else to excute the block based on given condition is true or false. Else is the optional part of if which executes when given condition in if is false.

Multiple if condition , nested if or if else ladder may be used to achieve the complex scenario.

PHP Program based on if else

 <html>
 <body bgcolor="gray">
 <center>
 <?php
 $n=43;
 if($n%2==0)
  {
    echo "Even no ";
   }
  else
  {
    echo "Odd no";
  }
?>
<center>
</body>
</html>

output of the above program is odd no as we know 43 is not devided by 2 .Later we will take input from user.

Multiple If

 <html>
 <body bgcolor="gray">
 <center>
 <?php
 $n=50;
 if($n%5==0)
  {
    echo "No is devided by 5";
   }
 if($n%10==0)
  {
   echo" No is devided by 10";
  }
  if($n%20 ==0)
   {
    echo"No is devided by 20";
   }
   if($n%50==0)
   {
    echo" No is devided by 50";
   }
 ?>
 </center>
 </body>
 </html>

output of the above program is no is devided by 5

no is devided by 10

no is devided by 50 [ no devided by 20 is not true].

Else if

 <html>
 <?php 
  if(<condition 1>)
  {
   //if block executes if condition 1 is true.
  }
  else if(<condition 2>)
   {
    // this block executes if condition 1 is false and condition 2 is true.
   }
   else{
      //this block executes if condtion 1 and condition 2 both are false.
     }
   ?>
  </html>

Nested if

 <html>
 <?php 
  if(<condition 1>)
  {
    //echo"this executes if the condition 1 is true";
    if(<condtion2>)
     { 
       //echo" this block executes when condtion1 and condtion 2 both are true";
     }
   // echo " this is outside inner if so executes if condition 1 is true 
 } 
?>
<html>

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If else in PHP

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