How to get back to the previous page method in multiple languages [Original]_asp Foundation

asp:

Copy Code code as follows:

<a href= "<%=request.servervariables (" Http_referer ")%>" >preivous page</a> or with pictures such as:

JS:Document.referer can

php:

Copy Code code as follows:

$url = $HTTP _server_vars["Http_referer"];
if ($url) {
$url _resource= $url;
}
else{
$url _resource= "input directly from the browser";
}

Note that the premise of the previous page, generally through a connection to, direct input is no use