Extracting the body text of an HTML document using PHP

StackOverflow https://stackoverflow.com/questions/4910975

Question

I know it's better to use DOM for this purpose but let's try to extract the text in this way:

<?php


$html=<<<EOD
<html>
<head>
</head>
<body>
<p>Some text</p>
</body>
</html>
EOD;


        preg_match('/<body.*?>/', $html, $matches, PREG_OFFSET_CAPTURE);

        if (empty($matches))
            exit;

        $matched_body_start_tag = $matches[0][0];
        $index_of_body_start_tag = $matches[0][1];

        $index_of_body_end_tag = strpos($html, '</body>');


        $body = substr(
                        $html,
                        $index_of_body_start_tag + strlen($matched_body_start_tag),
                        $index_of_body_end_tag - $index_of_body_start_tag + strlen($matched_body_start_tag)
        );

echo $body;

The result can be seen here: http://ideone.com/vH2FZ

As you can see, I am getting more text than expected.

There is something I don't understand, to get the correct length for the substr($string, $start, $length) function, I am using:

$index_of_body_end_tag - $index_of_body_start_tag + strlen($matched_body_start_tag)

I don't see anything wrong with this formula.

Could somebody kindly suggest where the problem is?

Many thanks to you all.

EDIT:

Thank you very very much to all of you. There is just a bug in my brain. After reading your answers, I now understand what the problem is, it should either be:

  $index_of_body_end_tag - ($index_of_body_start_tag + strlen($matched_body_start_tag));

Or:

  $index_of_body_end_tag - $index_of_body_start_tag - strlen($matched_body_start_tag);

No correct solution

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