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$s = '<a href=" ">a.5566.COM</a > 转换跳转成 www.333.COM /a<br/>
b.5566.com 转换跳转成 www.333.COM/b<br/>
123.5566.COM 转换跳转成 www.333.COM/*';
echo preg_replace("#(\w+)\.5566\.COM#i","www.333.com/$1",$s);
$server_name = $['SERVER_NAME'];
$url = $['REQUEST_URI'];
if($server_name=='www.333.COM'){
echo trim($url,'/') . '.5566.com';
}
$server_name = $['SERVER_NAME'];
$arr = explode('.',$server_name);
if(count($arr)==3 && $arr[0]!='www'){
header('Location: http://www.333.com/' . $arr[0]);
}