Conditional Examples

PHP - The if Statement

The if statement is used to execute some code only if a specified condition is true.

Syntax

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

The example below will output "Have a good day!" if the current time (HOUR) is less than 20:

Example

<?php
$t=date("H");
if ($t<"20")
  {
  echo "Have a good day!";
  }
?>

PHP - The if...else Statement

Use the if....else statement to execute some code if a condition is true and another code if the condition is false.

Syntax

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

The example below will output "Have a good day!" if the current time is less than 20, and "Have a good night!" otherwise:

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Example

<?php
$t=date("H");
if ($t<"20")
  {
  echo "Have a good day!";
  }
else
  {
  echo "Have a good night!";
  }
?>

PHP - The if...elseif....else Statement

Use the if....elseif...else statement to select one of several blocks of code to be executed.

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;
 }

The example below will output "Have a good morning!" if the current time is less than 10, and "Have a good day!" if the current time is less than 20. Otherwise it will output "Have a good night!":

Example

<?php
$t=date("H");
if ($t<"10")
  {
  echo "Have a good morning!";
  }
elseif ($t<"20")
  {
  echo "Have a good day!";
  }
else
  {
  echo "Have a good night!";
  }
?>

Example

<?php
$favcolor="red";
switch ($favcolor)
{
case "red":
  echo "Your favorite color is red!";
  break;
case "blue":
  echo "Your favorite color is blue!";
  break;
case "green":
  echo "Your favorite color is green!";
  break;
default:
  echo "Your favorite color is neither red, blue, or green!";
}
?>