<?php
if(!function_exists('fsockopen')) {
    echo '系统不支持fsockopen函数,请联系空间商';
}
$fp = fsockopen('smtp.qq.com', 25, $errno, $errstr, 10);
if(!$fp) {
    echo "联接失败了";
} else {
    echo "联接成功哦";
}
?>