Small fixes to improve memory performance, temporary code deletion and small typo in img file location.

includes/common_webrings.inc.php

@@ -19,6 +19,8 @@ function getFile(array $source){
 
         curl_close($curl);
     }
+    
+    unset($selected_source,$curl);
     return $file;
 }
 
@@ -29,6 +31,7 @@ function extractString(string $string,string $start_pattern, string $end_pattern
 
     $extracted_string = substr($string, $start_pos, $end_pos - $start_pos);
 
+    unset($start_pos,$end_pos);
     return $extracted_string;
 }
 
@@ -36,5 +39,7 @@ function extractString(string $string,string $start_pattern, string $end_pattern
 function scrapeWebsiteSites(array $source,string $start_pattern, string $end_pattern) {
     $script = getFile($source);
     $websites = extractString($script,$start_pattern,$end_pattern);
+
+    unset($script);
     return $websites;
 }