php采集代码：抓取网页中邮箱地址

<?php
/**
desc：采集网页中邮箱地址
  */
$url='http://www.xingzuo51.com'; //要采集的网址 
$content=file_get_contents($url);
//echo $content;

function getEmail($str) {
   //$pattern = "/([a-z0-9]*[-_.]?[a-z0-9]+)*@([a-z0-9]*[-_]?[a-z0-9]+)+[.][a-z]{2,3}([.][a-z]{2})?/i";
   $pattern = "/([a-z0-9-_.]+@[a-z0-9]+.[a-z0-9-_.]+)/";  //php正则
   preg_match_all($pattern,$str,$emailArr);

   return $emailArr[0];
}

print_r( getEmail($content));
?>