Philadelphia Reflections

The musings of a physician who has served the community for over six decades

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Website Development
The website technology supporting Philadelphia Reflections is PHP, MySQL and DHTML. The web hosting service is Internet Planners. The development of this website has provided an opportunity to learn new technology, to try out different techniques for getting noticed by the search engines and the trials and tribulations of dealing with malicious hackers and spammers who range from the annoying to the abusive. This collection of articles documents some of our experiences and we hope that people surfing the web looking for solutions to problems we've encountered will benefit.

George IV and Computers(1)
I got him into computers around 1960. He soon far surpassed me.

Program notes by GRF4

Regex URL Matching

On this site we check for the existence of a URL whenever an entry is updated

There are two key technologies at work

function url_exists($url) 
// checks whether a URL actually exists on the Internet
$handle   = curl_init($url);
if (false === $handle)
    return false;
curl_setopt($handle, CURLOPT_HEADER, false);
curl_setopt($handle, CURLOPT_FAILONERROR, true); 
curl_setopt($handle, CURLOPT_NOBODY, true);
curl_setopt($handle, CURLOPT_RETURNTRANSFER, false);
$connectable = curl_exec($handle);
return $connectable;

function aExists($matches)
// function called by preg_replace_callback
// $matches[0] is the complete match
// $matches[1] the match for the first subpattern
//	enclosed in '(...)' and so on

// checks to see if a regular link exists
// something similar is done for img src= also

$srcURL = $matches[3];
if (url_exists($srcURL)) {do something; return "";}  
else {do something else; return "";}

$foo = preg_replace_callback(
            '/(.*?)(<a .*?href=")([^"]*)("[^>]*>)(.*?)(<\/a>)/i',

(my thanks to for HTML encoding)

Originally published: Wednesday, December 12, 2007; most-recently modified: Monday, June 04, 2012


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