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10 days Learn PHP Day 7

web front end seven thousand four hundred and ten 14 years ago (2011-04-08)

Learning purpose: learn how to use SESSION
SESSION has many functions, most of which are variable transfer between pages within the site. At the beginning of the page, we want session_start(); Open SESSION;
Then you can use the SESSION variable. For example, to assign a value:$_ SESSION['item']="item1"; To get the value, $item1=$_SESSION ['item '];, It's very simple. Here we may use some functions, for example, to determine whether a SESSION variable is empty. You can write: empty ($_SESSION ['inum ']) returns true or false.
Let's take a look at a login program to determine whether the user name and password are correct.
The login form is as follows: login.php

PHP code

<table width= "100%" height= "100%" border= "0" align= "center" cellpadding= "0" cellspacing= "0" >
<tr>
<form action= "checklogin.php" method= "post" ><td align= "center" valign= "middle" ><table width= "400" border= "0" cellpadding= "5" cellspacing= "1" class = "tablebg" >
<tr class = "tdbg" >
<td colspan= "2" ><div align= "center" >Administrators Login</div></td>
</tr>
<tr class = "tdbg" >
<td><div align= "center" >Username</div></td>
<td><div align= "center" >
<input name= "username" type= "text" id= "username" >
</div></td>
</tr>
<tr class = "tdbg" >
<td><div align= "center" >Password</div></td>
<td><div align= "center" >
<input name= "password" type= "password" id= "password" >
</div></td>
</tr>
<tr class = "tdbg" >
<td colspan= "2" ><div align= "center" >
<input type= "submit" name= "Submit" value= "Submit" >
<input type= "reset" name= "Submit2" value= "Clear" >
</div></td>
</tr>
</table></td></form>
</tr>
</table>

This is how to process files

PHP code

<?
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>" ;
}
?>