An error occurred when using variables in html code. Thank you for your advice.

An error occurred when using variables in html code. Could you please kindly advise? could you tell me how the second input does not show the value? Thank you.

$ Urlfrom = $ _ SERVER ['http _ referer'];

?>

Reply to discussion (solution)

HTTP_REFERER does not always exist.

Just print it out.

I used other domain names for hyper-connection during the test. However
Urlfrom can get the value, while
Input is not displayed

HTTP Referer is a part of the header. when a browser sends a request to a web server, it usually carries a Referer to tell the server which page the link is from, the server obtains some information for processing.

We can see that:
1. if it is not a link, no
2. although it is generally carried, it can also be left blank

HTTP Referer is a part of the header. when a browser sends a request to a web server, it usually carries a Referer to tell the server which page the link is from, the server obtains some information for processing.

We can see that:
1. if it is not a link, no
2. although it is generally carried, it can also be left blank

Rising posture

Var_dump ($ urlfrom); check it out.

The idea above is correct.
I should simplify the problem to solve my problem: the input does not display the value of $ urlfrom. please advise.

$ Urlfrom = "bbbb ";

?>