Preg_replace Technique #1

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        // This is a useful technique for passing matched data into other
// functions to be evaluated and replaced in parsed strings.
//
// This example is simple. It rewrites the <img> tag emulating being
// passed thru a proxy.

$html = file_get_contents('http://www.yahoo.com/');
print "$html<br><br>";
$attr= 'src';
$webroot='proxy';
$html=preg_replace('/(\s)?'.$attr.'="([^\s]*?)"/ei',
                   "make_new_img_tag('$attr','$2','$1','$webroot');",
                   $html);
print "<!-- $html -->";


function make_new_img_tag($attr, $filename, $prefix, $webroot) {
    $b64val = base64_encode($filename);
    return $prefix$attr.'="'.$webroot.'/browse/'.$b64val.'"';
}

Tags:
• php
• preg_replace
• regex