array ( 0 => 'index.php', 1 => 'PHP Manual', ), 'head' => array ( 0 => 'UTF-8', 1 => 'en', ), 'this' => array ( 0 => 'language.basic-syntax.comments.php', 1 => 'Comments', 2 => 'Comments', ), 'up' => array ( 0 => 'language.basic-syntax.php', 1 => 'Basic syntax', ), 'prev' => array ( 0 => 'language.basic-syntax.instruction-separation.php', 1 => 'Instruction separation', ), 'next' => array ( 0 => 'language.types.php', 1 => 'Types', ), 'alternatives' => array ( ), 'source' => array ( 'lang' => 'en', 'path' => 'language/basic-syntax.xml', ), 'history' => array ( ), ); $setup["toc"] = $TOC; $setup["toc_deprecated"] = $TOC_DEPRECATED; $setup["parents"] = $PARENTS; manual_setup($setup); contributors($setup); ?>

Comments

PHP supports 'C', 'C++' and Unix shell-style (Perl style) comments. For example:

Example #1 Comments

<?php
echo "This is a test\n"; // This is a one-line c++ style comment
/* This is a multi line comment
yet another line of comment */
echo "This is yet another test\n";
echo "One Final Test\n"; # This is a one-line shell-style comment
?>

The "one-line" comment styles only comment to the end of the line or the current block of PHP code, whichever comes first. This means that HTML code after // ... ?> or # ... ?> WILL be printed: ?> breaks out of PHP mode and returns to HTML mode, and // or # cannot influence that.

Example #2 One Line Comments

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

'C' style comments end at the first */ encountered. Make sure you don't nest 'C' style comments. It is easy to make this mistake if you are trying to comment out a large block of code.

<?php
/*
echo 'This is a test'; /* This comment will cause a problem */
*/
?>