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Php language supports three annotation styles: 1, C++ style, using "/ /" symbol, syntax "/ / comment content"; 2, C language style, using "/ * * /" symbol, grammar "/ * comment content * /"; 3, Shell style (Perl style), using "#" symbol, syntax "# comment content".

Operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

PHP supports three annotation styles: Cregorian + and Unix Shell style (Perl style)

① single-line comments (C++ style), symbol: / /

② multiline comments (C style), symbol: / * /

③ special single-line comments (not commonly used, Shell style), symbol: #

1. Notes on C++ style (/ /)

This kind of comment cannot appear? > tag. If short_open and asp_tag settings are turned on, > and% > cannot appear in the comment either.

2. C language style (/ * /), nested annotations are not allowed

C-style comments end when they encounter the first "* /", so multiline comments cannot be nested, otherwise a syntax error will be reported.

3. Shell style (#), same as the ban on C++

The three annotation styles are as follows

Note: single-line comments are only commented to the end of the line or the current PHP code block (there is "? >" at the end of the line and will not be commented. PHP will jump out of PHP mode when it encounters "? >", followed by parsing HTML code or other)

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