is_search_request in php and reorganizing

php_lib/web_util.php

@@ -0,0 +1,15 @@
+function is_search_request() {
+    $r = $_SERVER['HTTP_REFERER'];
+    $engines = array('/search?',
+                'images.google.',
+                'search.yahoo.com',
+                'del.icio.us/search',
+                'msn.com',
+                'live.com',
+                );
+    foreach ($engine as $eng) {
+        if (strpos($r,$eng) !== false)
+             return true;
+    }
+    return false;
+}