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// return the MIME type

function parseMimeType($str)

{

preg_match(‘/Content-Type: (.*)/‘, $str, $matches);

return (isset($matches[1]) ? $matches[1] : ‘(not available)‘);

}

// return the Content-Length

function parseContentLength($str)

{

preg_match(‘/Content-Length: (.*)/‘, $str, $matches);

return (isset($matches[1]) ? $matches[1] : ‘(not available)‘);

}

// return the Location

function parseLocation($str)

{

preg_match(‘/Location: ?([^\r\n]*)/i’, $str, $matches);

return (isset($matches[1]) ? $matches[1] : ‘(not available)‘);

}

// return the path to the destination URL

function getPath($url, &$_response_code, $userAgent = ‘Mozilla/4.0’)

{

$_url = $url;

$path = array();

$path[] = ‘Initial destination ‘ . $_url;

$iterations = 0;

do

{

$_buffer = LinkChecker::getHeader($_url);

if (!$_buffer)

{

$path[] = ‘ERROR: Maximum number of redirections exceeded; aborting.’;

break;

}

$_url = LinkChecker::parseLocation($_buffer) ?

LinkChecker::parseLocation($_buffer) : $_url;

$_response_code = LinkChecker::parseResponseCode($_buffer);

$path[] = ($_response_code != 200 && $_response_code != 404) ?

(‘Redirect (‘ . $_response_code . ‘) to => ‘ . $_url) :

(‘Final destination (‘ . $_response_code . ‘) ‘ . $_url );

$iterations++;

if ($iterations > 10)

{

$path[] = ‘ERROR: Maximum number of redirections exceeded; aborting.’;

break;

}

}

while ($_response_code != ‘200’ && $_response_code != ‘404’);

256

Chapter 13: Coping with Technical Issues

c13.qxd:c13 10:45 256

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