How many ways are there to comment out code in PHP? What are they?

HP supports C, C++ and Unix shell-style (Perl-style) annotations. For example:

<?php
     echo  "This is a test" ;  // This is a one-line c++ style comment
    
     echo  "This is yet another test" ;
    echo  &#39;One Final Test&#39; ;  # This is a one-line shell-style comment
?>

A single-line comment only comments to the end of the line or to the current PHP code block, whichever comes first. This means that the HTML code after // ... ?> or # ... ?> will be displayed: ?> jumps out of PHP mode and returns to HTML mode, // or # does not affect at this point. If the asp_tags configuration option is enabled, its behavior is the same as // %> or # %> . However, the tag does not break out of PHP mode in single-line comments.

<h1>This is an <?php  # echo &#39;simple&#39;; ?> example</h1>
<p>The header above will say &#39;This is an  example&#39;.</p>

C-style comments end when the first */ is encountered. Be sure not to nest C-style comments. This error can easily occur when trying to comment out a large chunk of code.

<?php
  
  */
?>

PHP commentsThere are two types:

Use double slashes// This is to comment out a line of code, such as

//$message = 'abc';

Use /* and */ This is to comment out a large paragraph, such as

/*
$today = 'tomorrow';
*/

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