excode_filter

functions.php

function excode_filter($content) {
	return preg_replace_callback('/(\\[?)(\\[excode ([^\\]]*?)\\])\\]?/', function($m) {
		if ($m[1]) return $m[2];
		$out = '[' . 'code';
		$pairs = preg_split("/\s+/", $m[3]);
		foreach ($pairs as $pair) {
			list($key, $value) = explode('=', $pair);
			if ($key == 'src') $src_url = preg_replace('/["\']/', '', $value);
			elseif ($key == 'link') $link_url = preg_replace('/["\']/', '', $value);
			elseif ($key == 'title') $title = preg_replace('/["\']/', '', $value);
			else $out .= ' ' . $pair;
		}
		$link_url = $link_url ? $link_url : $src_url;
		$title = $title ? $title : $link_url;
		$src = $src_url ? file_get_contents($src_url) : FALSE;
		$out .= sprintf(' title=\'<a href="%s">%s</a>\']', $link_url, $title);
		$out .= $src !== FALSE ? $src : '(Not available)';
		$out .= '[' . '/code]';
		return $out;
	}, $content);
}
add_filter('the_content', 'excode_filter', 6);