Php cannot read cookies

Php cannot read cookies and makes a logon interface. it automatically remembers the username function if (empty ($ _ POST ['chkremember']) & nbsp ;{& nbsp; & nbsp; & nbsp; // The user does not select a ticket & nbsp; php cannot read cookies.
Create a login interface to automatically remember the user name

If (empty ($ _ POST ['chkremember']) {
// The user does not select a single region
If (! Empty ($ _ COOKIE ['username']) {
Setcookie ('username', '', time ()-100 );
}
} Else {
// Select a ticket
Setcookie ('username', $ username, time () + 7*24*3600 );
}

When a user selects a single token that remembers the user name, the COOKIE has been saved. a COOKIE file (administrator@localhost=12.16.txt) is added to the C: \ Users \ Administrator \ AppData \ Roaming \ Microsoft \ Windows \ cookiesmenu, and the content is correct.

However, it fails to read the COOKIE.
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Function GetCookieVal ($ key ){
If (empty ($ _ COOKIE [$ key]) {
Return "none ";
} Else {
Return $ _ COOKIE [$ key];
}
}
?>

Print the COOKIE array print_r ($ _ COOKIE) directly );
The result is also an empty array.


Why is this?
Is the COOKIE storage path inconsistent with the read path?

Share:
------ Solution --------------------
1,
Setcookie ('username', $ username, time () + 7*24*3600 );
And
GetCookieVal ("username ")
It must be performed in different HTTP sessions

2. You did not specify the path when setting the cookie.
Therefore, the cookie is valid only in the path of the program that executes setcookie.
If the program executing GetCookieVal is not in the same path, the value is not obtained.

Setcookie ('username', $ username, time () + 7*24*3600 ,'/');
In this way, the cookie variable username can be valid throughout the website.