Slide 5.6: PHP if statement

PHP if Statement

The if, elseif, and else statements in PHP are used to perform different actions based on different conditions.

Conditional Statements
Two conditional statements are

if...else statement—use this statement if you want to execute a set of code when a condition is true and another if the condition is not true.

elseif statement—is used with the if...else statement to execute a set of code if one of several condition are true.

The if...else Statement
If you want to execute some code if a condition is true and another code if a condition is false, use the if...else statement.

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

The gmdate function formats a local time/date.
If more than one line should be executed, the lines should be enclosed within curly braces.
Variable values will be used by using double quotes but not single quotes.
Functions will not be called if they are enclosed by quotes.

 <html><body>
 <?php
   $day = gmdate( "D" );
   if ( $day == "" ) {
     echo '$day';
   }
   else
     echo "$day";
 ?>
 </body></html>

      Output =

 <html><body>
 <?php
   $hour = gmdate( "H" );
   if ( $hour >  )
     echo 'date("Y")';
   else
     echo "date('Y')";
 ?>
 </body></html>

Output =