`, and `` tags, explaining the query about a processing instruction not being closed:

“`html

Processing Instruction Not Closed

A processing instruction in XML or XHTML is an instruction that begins with “<?” and ends with “?>“. It provides directions for how the document should be processed.

Example:

    <?php
      echo "Hello, World!";
    ?>
  

In the given example, we have a PHP processing instruction that should be enclosed within “<?php” and “?>“. If the instruction is not properly closed, it will result in an error.

Corrected Example:

    <?php
      echo "Hello, World!";
    ?>
  

In the corrected example, the PHP processing instruction is properly closed, and it will execute without any errors.

Make sure to always properly close any processing instructions used in your code to avoid syntax errors or unexpected behavior.

“`

In this example, the HTML content is enclosed within a `

` tag to separate it from the rest of the HTML document. It explains the concept of a processing instruction and provides an example in PHP. It also demonstrates the corrected version of the example to ensure the processing instruction is closed properly.

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