Home > Developer > PHP

Definition and usage of PHP function echo ()-PHP Tutorial-php Tutorial

Source: Internet
Author: User
Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞
PHP function echo () definition and usage analysis. Output one or more strings when using the definition and usage PHP function echo. The description of the echo (strings) parameter is required. One or more strings to be sent to the output. Prompt to use Definition and usage

The PHP function echo () outputs one or more strings.

Syntax

Echo (strings)

Parameter description

Strings is required. One or more strings to be sent to the output.

Tips and comments

Note: echo () is actually not a function, so you do not need to use parentheses for it. However, if you want to pass one or more parameters to echo (), a parsing error occurs when brackets are used.

Tip: The echo () function is a little faster than the print () function.

Tip: PHP function echo () can use simplified syntax. See the following example.

 
 
    
  
  
  1. <html> <body> 
    2. 
  
  
  2.   php $color = "red"; ?>
    3. 
  
  
  3.  <p>Roses are 
    4. 
  
  
  4.   =$color?>
    5. 
  
  
  5.   p>
    6. 
  
  
  6.   body> 
    7. 
  
  
  7.   html> 
    8.

1. echo output scalar

 
 
    
  
  
  1.  Php 
    2. 
  
  
  2. Echo 123adb; // The output is correct.
    3. 
  
  
  3. Echo 123abd; // correct
    4. 
  
  
  4. Echo "123adb"; // correct
    5. 
  
  
  5. ?> 
    6.

2. PHP function echo () output variable, constant

 
 
    
  
  
  1.  Php 
    2. 
  
  
  2. $A="123456";
    3. 
  
  
  3. Echo $ a; // correct
    4. 
  
  
  4. Echo" Br>";
    5. 
  
  
  5. Echo "$ a"; // correct
    6. 
  
  
  6. Echo" Br>";
    7. 
  
  
  7. Echo $ a; // incorrect
    8. 
  
  
  8. Echo" Br>";
    9. 
  
  
  9. Echo abcdef; // it can be correctly displayed, but it is strongly not recommended to do so,
    This is because many special characters cannot be correctly displayed.
    10. 
  
  
  10. Echo" Br>";
    11. 
  
  
  11. // Echo<Abd>; // For example, if the tip is included, it cannot be used,
    You can go to the previous comment and try to see if it will return an error.
    12. 
  
  
  12. Echo" Br>";
    13. 
  
  
  13. $B=10;
    14. 
  
  
  14. Echo $ B + 10; // Display 20
    15. 
  
  
  15. Echo" Br>";
    16. 
  
  
  16. Echo "$ B + 10 ";
    17. 
  
  
  17. Echo" Br>";
    18. 
  
  
  18. Echo "the result is:". "$ B"; // The two statements have the same effect.
    19. 
  
  
  19. Echo" Br>";
    20. 
  
  
  20. Echo "result: $ B"; // The two statements have the same effect.
    21. 
  
  
  21. ?> 
    22.

Echo "" is different from PHP function echo (). when double quotation marks are added, variables and specific symbols are escaped, the single quotation marks are output directly, so it is faster to use single quotation marks than to use double quotation marks. Do not use double quotation marks.


Define and use the PHP function echo () to output one or more strings. The description of the echo (strings) parameter is required. One or more strings to be sent to the output. Prompt...

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:
php mail function tutorial php header function tutorial json and php tutorial php and database tutorial php and javascript tutorial php and json tutorial php and mysqli tutorial

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