Phone Number Extractor in PHP

Here is a function to parse the content of a web page and extract phone / fax numbers (USA only). Regular expression is used to parse phone numbers.

 function extract_phone_numbers ($html_content)    
 {    
     $html_content = preg_replace("/[\s\+\-\(\)\.]/", "", $html_content);    
     $ara = array();    
     if (preg_match_all('/\D(\d{10})\D/', $html_content, $data)) {        
         $ara = array_unique($data[1]);        
     }    
     if (preg_match_all('/1(\d{10})\D/', $html_content, $data)) {        
         $ara = array_unique(array_merge($ara, $data[1]));    
     }    
     if (preg_match_all('/^(\d{10})$/', $html_content, $data)) {        
         $ara = array_unique(array_merge($ara, $data[1]));    
     }    
     return $ara;    
 }    

Email extractor in PHP using regex

Today, I am sharing my PHP code that extracts email address from html source of an URL. It uses regular expression to parse email address.

 function extract_email_addresses ($html_source)    
 {    
     $html_source = str_replace("(at)", "@", $html_source);    
     $html_source = str_replace("[at]", "@", $html_source);    
     $html_source = str_replace("(dot)", ".", $html_source);    
     $html_source = str_replace("[dot]", ".", $html_source);    
     $html_source = strtolower($html_source);    
     $ara = array();    
     if (preg_match_all('/([_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3}))/', $html_source, $data)) {        
         $ara = array_unique($data[1]);    
     }    
     return $ara;    
 }    

Please share your thoughts to improve the function.