PHP provides several code comment styles, what are they?

php provides 3 code comment styles, which are: 1. C-style single-line comments, the syntax is "//comment content"; 2. C-style multi-line comments, the syntax is "/* comment content" */"; 3. UNIX-style single-line comments, the syntax is "# comment content".

The operating environment of this tutorial: Windows 7 system, PHP version 7.1, DELL G3 computer

Comments in the PHP code will not be treated as programs to read and execute. Its function:

• Code explanation

• Description of script related information

• Convenient for debugging, Test

php provides 3 code comment styles:

①Single line comment (C style), symbol: //

<?php
echo "单行注释" ;//一般在代码右边少量说明或写在代码前面使之失效
?>

②Multi-line comments (C style), symbols: /* */

<?php
echo "多行注释" ;
echo "多行注释" ;
/*
一般说明脚本的相关信息，如版本，版权，作者日期等
使一长段代码失效
*/
?>

③Special single-line comments (not commonly used, UNIX style), Symbol:

<?php
echo "单行注释" ;#一般在代码右边少量说明或写在代码前面使之失效
?>

Recommended study: "PHP Video Tutorial"

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