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Notes in "PHP Basics" PHP

2022-07-27 08:06:00 【Go home at night】

Functional requirements

by PHP Add comments to code

The sample code 

<!doctype html>

<html>

<head>

<meta charset="utf-8">

<title>php Common marks in </title>

</head>



<body>

<?php

  echo "C++ Style single line notes with // From the beginning to the end of the line <br />"; // C++ Style single line notes 

  /*

    C Style multi line comments 

     Many lines in the middle are comments 

  */

  echo "C Style multi line comments with /* start , With */ end <br />";

  echo "Shel Style notes in # From the beginning to the end of the line ";  # shell Style notes 

?>

</body>

</html>

Running results

 

 

Knowledge description

In program development , For the convenience of code reading 、 Understanding and maintenance , You can use comments to explain and explain the code . Comments will be ignored by the parser when the program is running .PHP Support multiple styles of annotations ：

// C++ Style single line notes ：C++ Style single line notes ,“//” The following content is a single line comment , from “//” Start , To the end of the line or PHP Everything before the end of the tag is a comment .

/*

  C Style multi line comments

   Many lines in the middle are comments

*/：“/*” and “*/” The contents between are multi line comments , Multiline comments to “/*” Start , With “*/” end . meanwhile , Single line comments can be nested in multi line comments , But you can't nest multiple lines of comments .

# shell Style notes ：“#” It's a Shell Style single line notes . stay PHP The single line annotation that is more used in development is “//” The opening single line comment .

Code comments are usually written on the top or right of the commented code , Don't write it at the bottom of the code . Nesting is not allowed for multiline comments .

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