Home > Developer > PHP

PHP Getting started: If... Else condition judgment statement

Source: Internet
Author: User
Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞

If, elseif, and else statements are used to execute different actions based on different conditions.

Condition Statement
When writing code, you often need to perform different actions for different judgments.

You can use conditional statements in the code to complete this task.

If... Else statement

Execute one piece of code when the conditions are met, and execute another piece of code when the conditions are not met.
Elseif statement
And if... Else is used together to execute a code block when several conditions are met.
If... Else statement
If you want to execute some code when a condition is set, and execute other code when the condition is not met, use if .... Else statement.

Syntax
If (condition)
Code to be executed if condition is true;
Else
Code to be executed if condition is false;

Instance
If the current date is Friday, the following code will output "Have a nice weekend !", Otherwise, "Have a nice day!" is output !" :

The code is as follows: Copy code

<Html>
<Body>

<? Php
$ D = date ("D ");
If ($ d = "Fri ")
Echo "Have a nice weekend! ";
Else
Echo "Have a nice day! ";
?>

</Body>
</Html>


If you need to execute multiple lines of code when the conditions are true or fail, you should include these lines in curly brackets:

The code is as follows: Copy code

<Html>
<Body>

<? Php
$ D = date ("D ");
If ($ d = "Fri ")
  {
Echo "Hello! <Br/> ";
Echo "Have a nice weekend! ";
Echo "See you on Monday! ";
  }
?>

</Body>
</Html>

ElseIf statement
To execute code when multiple conditions are created, use the elseif statement:

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;

Instance
If the current date is Friday, the following example will output "Have a nice weekend !", If it is Sunday, output "Have a nice Sunday !", Otherwise, "Have a nice day!" is output !" :

The code is as follows: Copy code

<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>

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
if else condition in php php if else statement php if else if statement if else if condition php if else statement example php if then else statement if else condition

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

What's Trending
Top 10 Tags
datastax versions naming convention zookeeper client class definition md5 microsoft sql server 2005 data structures exception handling error handling
Top 10 Keywords
microsoft download center down wordpress address url site address url wordpress address url windows installer 4 0 download 302 not found web address url definition site address url wordpress db2 integer mac os installation step by step pdf abbreviation for return

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

  • Sales Support

    1 on 1 presale consultation

    Chat Contact Sales

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    Open a Ticket

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

    Learn More