| The code is as follows: |
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<Html>
<Head>
<Title> Login </title>
<Meta http-equiv = "Content-Type" content = "text/html; charset = gb2312">
</Head>
<Body>
<Form name = "form1" method = "post" action = "login. php">
<Table width = "300" border = "0" align = "center" cellpadding = "2" cellspacing = "2">
<Tr>
<Td width = "150"> <div align = "right"> user name: </div> </td>
<Td width = "150"> <input type = "text" name = "username"> </td>
</Tr>
<Tr>
<Td> <div align = "right"> Password: </div> </td>
<Td> <input type = "password" name = "passcode"> </td>
</Tr>
<Tr>
<Td> <div align = "right"> Cookie retention Time: </div> </td>
<Td> <select name = "cookie" id = "cookie">
<Option value = "0" selected> browser process </option>
<Option value = "1"> save for 1 day </option>
<Option value = "2"> save for 30 days </option>
<Option value = "3"> 365 days </option>
</Select> </td>
</Tr>
</Table>
<P align = "center">
<Input type = "submit" name = "Submit" value = "Submit">
<Input type = "reset" name = "Reset" value = "Reset">
</P>
</Form>
</Body>
</Html> |
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<? Php
@ Mysql_connect ("localhost", "root", "1981427") // you must connect to the database server before selecting a database.
Or die ("database server connection failed ");
@ Mysql_select_db ("test") // select the database mydb
Or die ("The database does not exist or is unavailable ");
// Obtain user input
$ Username = $ _ POST ['username'];
$ Passcode = $ _ POST ['passcode'];
$ Cookie = $ _ POST ['cooker'];
// Execute the SQL statement
$ Query = @ mysql_query ("select username, userflag from users"
. "Where username = '$ username' and passcode =' $ passcode '")
Or die ("SQL statement execution failed ");
// Determine whether the user exists and the password is correct
If ($ row = mysql_fetch_array ($ query ))
{
If ($ row ['userflag'] = 1 or $ row ['userflag'] = 0) // Determine whether the user permission information is valid
{
Switch ($ cookie) // Set the cookie retention time based on the user's selection
{
Case 0: // Save the Cookie as a browser process
Setcookie ("username", $ row ['username']);
Break;
Case 1: // save for 1 day
Setcookie ("username", $ row ['username'], time () + 24*60*60 );
Break;
Case 2: // save for 30 days
Setcookie ("username", $ row ['username'], time () + 30*24*60*60 );
Break;
Case 3: // save 365 days
Setcookie ("username", $ row ['username'], time () + 365x24*60*60 );
Break;
}
Header ("location: main. php"); // automatically jumps to main. php
}
Else
{
Echo "incorrect user permission information ";
}
}
Else
{
Echo "incorrect user name or password ";
}
?> |
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<? Php
Session_start ();
If (isset ($ _ COOKIE ['username'])
{
@ Mysql_connect ("localhost", "root", "1981427") // you must connect to the database server before selecting a database.
Or die ("database server connection failed ");
@ Mysql_select_db ("test") // select the database mydb
Or die ("The database does not exist or is unavailable ");
// Obtain the Session
$ Username = $ _ COOKIE ['username'];
// Execute the SQL statement to obtain the userflag value
$ Query = @ mysql_query ("select userflag from users"
. "Where username = '$ username '")
Or die ("SQL statement execution failed ");
$ Row = mysql_fetch_array ($ query );
// Obtain user permission information
$ Flag = $ row ['userflag'];
// Output different welcome information based on the userflag value
If ($ flag = 1)
Echo "welcome administrator". $ _ SESSION ['username']. "log on to the system ";
If ($ flag = 0)
Echo "welcome". $ _ SESSION ['username']. "log on to the system ";
Echo "<a href =" logout. php "mce_href =" logout. php "> logout </a> ";
}
Else
{
Echo "you are not authorized to access this page ";
}
?> |
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| The code is as follows: |
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<? Php
Setcookie ("username ");
Echo "logout successful ";
?> |
