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// +----------------------------------------------------------------------+

// | LinkChecker |

// | Gets URL header data using cURL |

// +----------------------------------------------------------------------+

// | Copyright (c) 2003 Jaimie Sirovich |

// +----------------------------------------------------------------------+

// | Author: Jaimie Sirovich <jsirovic@gmail.com> |

// +----------------------------------------------------------------------+

class LinkChecker

{

// helper function for the cURL request

function CURLOPT_WRITEFUNCTION($ch, $str)

{

global $LINKCHECKER_total_str;

$LINKCHECKER_total_str .= $str;

if (preg_match(‘/^(.*?)\r\n\r\n/s’, $LINKCHECKER_total_str, $matches))

{

echo $matches[1];

return -1;

}

else

{

return strlen($str);

}

}

// return the header data

function getHeader($url, $userAgent = “Mozilla/4.0”)

{

global $LINKCHECKER_total_str;

$LINKCHECKER_total_str = “”;

ob_start();

$ch = curl_init();

curl_setopt ($ch, CURLOPT_URL, $url);

curl_setopt ($ch, CURLOPT_USERAGENT, $userAgent);

curl_setopt ($ch, CURLOPT_HEADER, 1);

curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);

curl_setopt ($ch, CURLOPT_FOLLOWLOCATION, 1);

curl_setopt ($ch, CURLOPT_TIMEOUT, 60);

curl_setopt ($ch, CURLOPT_WRITEFUNCTION,

array(“LinkChecker”, “CURLOPT_WRITEFUNCTION”));

$result = curl_exec($ch);

curl_close($ch);

return ob_get_clean();

}

// return response code

function parseResponseCode($str)

{

preg_match(‘/^HTTP\/\d\.\d (.{3})/‘, $str, $matches);

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

}

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Chapter 13: Coping with Technical Issues

c13.qxd:c13 10:45 255

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