   #PHP Manual Basic syntax Instruction separation Types

              PHP Manual
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Comments

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

   <?php
       echo "This is a test"; // 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";
       echo "One Final Test"; # This is shell-style style comment
   ?>

   The "one-line" comment styles actually only comment to the end of the
   line or the current block of PHP code, whichever comes first.

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

   You should be careful not to nest 'C' style comments, which can happen
   when commenting out large blocks.

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

   The one-line comment styles actually only comment to the end of the
   line or the current block of PHP code, whichever comes first. This
   means that HTML code after // ?> WILL be printed: ?> skips out of the
   PHP mode and returns to HTML mode, and // cannot influence that. If
   asp_tags configuration directive is enabled, it behaves the same with
   // %>.
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