Objective: to learn how to use a SESSION has many functions. most of the functions are to pass variables between pages on the site. At the beginning of the page, we want to start session_start (); enable the SESSION; then we can use the SESSION variable. for example, to assign a value: $ _ SESSION [item] item1; the value to be obtained is $ item1 $ _ SESSION [item];, which is simple. Objective: to learn how to use a SESSION
SESSION has many functions, most of which are the variable transfer between pages on the site. At the beginning of the page, we want session_start (); to enable SESSION;
Then you can use the SESSION variable. for example, the value to be assigned is $ _ SESSION ['item'] = "item1 "; the value to be obtained is $ item1 = $ _ SESSION ['item'];, which is simple. Here we may use some functions. for example, to determine whether a SESSION variable is null, we can write: empty ($ _ SESSION ['inum']) and return true or false.
Next, let's take a look at the above description to check whether the user name and password are correct.
The login form is as follows: login. php
This is the case when processing files.
Require_once ('Conn. php ');
Session_start ();
$ Username = $ _ POST ['username'];
$ Password = $ _ POST ['password'];
$ Exec = "select * from admin where username = '". $ username ."'";
If ($ result = mysql_query ($ exec ))
{
If ($ rs = mysql_fetch_object ($ result ))
{
If ($ rs-> password = $ password)
{
$ _ SESSION ['adminname'] = $ username;
Header ("location: index. php ");
}
Else
{
Echo "script alert ('password Check Error! '); Location. href = 'login. php'; script ";
}
}
Else
{
Echo "script alert ('username Check Error! '); Location. href = 'login. php'; script ";
}
}
Else
{
Echo "script" alert ('database Connection Error! '); Location. href = 'login. php'; script ";
}
?>
Conn. php is like this:
$ Conn = mysql_connect ("127.0.0.1 ","","");
Mysql_select_db ("shop ");
?>
Because $ _ SESSION ['adminname'] = $ username; we can write a file to verify whether the statement is logged on: checkadmin. asp.
Session_start ();
If ($ _ SESSION ['adminname'] = '')
{
Echo "script" alert ('Please Login First '); location. href = 'login. php'; script ";
}
?>
Let's talk about how to create a page tomorrow.
