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PHP Decision Making

PHP Decision Making


Hello folks! welcome back to a new section of our tutorial on PHP. In this tutorial guide, we will be discussing about PHP Decision Making.

The if, elseif .....else and switch statements are used to make vital decisions based on different coditions.

Conditional Statements

Conditional statements can be used in your code to make decisions. PHP supports the following three conditional statements -

Flowchart

Conditional Statement Flowchart

  • if...else statement - Make use of this statement if you want to execute a set of code when a given condition is true and another if the condition isn't true.
  • elseif statement - It is used with the if...else statement to execute a set of code if one of the several conditions is true.
  • switch statement - is used if you want to select one of many blocks of code to be executed, use switch statement. The switch statement is used to avoid long blocks of if...elseif...else codes.


PHP if....else Statement

The If...Else Statement

If you want to execute a code if a condition is true and another code if a condition isn't true (false), then use the if...else statement.

Flowchart

PHP if....else Statement Flowchart

Syntax

if (condition)
   code to be executed if condition is true;
else
   code to be executed if condition is false;

Example

The following code is going to output "have a nice weekend!" if the current day is friday. Else, it will output "have a nice day!".

<html>
   <body>
   
      <?php
         $d = date("D");
         
         if ($d == "Fri")
            echo "Have a nice weekend!"; 
         
         else
            echo "Have a nice day!"; 
      ?>
   
   </body>
</html>

Output

When the above code is executed, it will produce the following result -

Have a nice weekend!


PHP Elseif Statement

The Elseif Statement

If you intend to execute some PHP codes if one of the several given conditions are true, then use the elseif statement.

Flowchart

PHP Elseif Statement Flowchart

Syntax

if (condition)
   code to be executed if condition is true;
elseif (condition)
   code to be executed if condition is true;
else
   code to be executed if condition is false;

Example

The following code is going to output "Have a nice weekend!" if the current day is Friday, and "Have a nice Sunday!" if current day is Sunday, otherwise it will output "Have a nice day!".

<html>
   <body>
   
      <?php
         $d = date("D");
         
         if ($d == "Fri")
            echo "Have a nice weekend!";
         
         elseif ($d == "Sun")
            echo "Have a nice Sunday!"; 
         
         else
            echo "Have a nice day!"; 
      ?>
      
   </body>
</html>

Output

When the above code is executed, it will produce the following result -

Have a nice Weekend!


PHP Switch Statement

Switch Statement

If you want to select one of many blocks of code to be executed, then make use of the switch statement.

The switch statement is used to avoid long blocks of if...elseif...else code.

Flowchart

PHP Switch Statement Flowchart

Syntax

switch (expression){
   case label1:
      code to be executed if expression = label1;
      break;  
   
   case label2:
      code to be executed if expression = label2;
      break;
      default:
   
   code to be executed
   if expression is different 
   from both label1 and label2;
}

Example

The switch statement works in an unusual manner. First it evaluates given expression and then searches for a label to match the resulting value. If it finds a matching value, then the code associated with the matching label will be executed or if none of the label matches any value, then the statement will execute any default code.

<html>
   <body>
      
      <?php
         $d = date("D");
         
         switch ($d){
            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";
               break;
            
            case "Sat":
               echo "Today is Saturday";
               break;
            
            case "Sun":
               echo "Today is Sunday";
               break;
            
            default:
               echo "Wonder which day is this ?";
         }
      ?>
      
   </body>
</html>

Output

When the above code is executed, it will produce the following result -

Today is Monday


Alright guys! This is where we are rounding up for this tutorial post. In our next tutorial guide, we are going to be discussing about the PHP Loops.

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Thanks for reading and bye for now.

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