All Syllabus

Home About PHP HTML CSS SQL Java Script jQuery AJAX      

PHP Tutorial

PHP Introduction

PHP 5 Installation

PHP 5 Syntax

PHP 5 Variables

PHP 5 echo and print Statements

PHP 5 Data Types

PHP 5 String Functions

PHP 5 Constants

PHP Arithmetic Operators

PHP 5 if...else...elseif Statements

PHP 5 switch Statement

PHP 5 while Loops

PHP 5 for Loops

PHP 5 Functions

PHP 5 Arrays

PHP 5 Sorting Arrays

PHP 5 Superglobals

PHP Forms

PHP 5 Form Handling

PHP 5 Form Validation

PHP 5 Forms - Required Fields

PHP 5 Forms E-mail /URL

PHP Form Complete

PHP Advanced

PHP 5 Multidimensional Arrays

PHP 5 Date and Time

PHP Include Files

PHP File Handling

PHP File Open/Read

PHP File Create/Write

PHP File Upload

PHP Cookies

PHP Sessions

PHP E-mail

PHP Secure E-mails

PHP Error Handling

PHP Exception Handling

PHP Filter

PHP Database

PHP MySQL Introduction

PHP MySQL Connect

PHP Create DB/Tables

PHP MySQL Insert Into

PHP MySQL Select

PHP MySQL Where

PHP Order By

PHP Update

PHP Delete

PHP ODBC

 

PHP 5 if...else...elseif Statements

Conditional statements are used to perform different actions based on different conditions.


PHP Conditional Statements

Very often when you write code, you want to perform different actions for different decisions. You can use conditional statements in your code to do this.

In PHP we have the following conditional statements:

  • if statement - executes some code only if a specified condition is true
  • if...else statement - executes some code if a condition is true and another code if the condition is false
  • if...elseif....else statement - selects one of several blocks of code to be executed
  • switch statement - selects one of many blocks of code to be executed

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:

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!";
}
?>