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PHP section--session three ways to use

Source: Internet
Author: User
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I. Displaying the user's information between different pages

Two. Control Login

1. Login Page

<body>
<form action= "loginchuli.php" method= "POST" >
<div> Username: <input type= "text" name= "UID"/></div>
<div> Password: <input type= "password" name= "pwd"/></div>
<input type= "Submit" value= "Login"/>
</form>
</body>

2. Login Processing page

<?php
Session_Start ();
Include ("DBDA.class.php");
$db = new Dbda ();

$uid = $_post["UID"];
$pwd = $_post["pwd"];

$sql = "Select pwd from users where uid= ' {$uid} '"; Password is determined by user name
$attr = $db->query ($sql);

$mm = $attr [0][0]; Remove password

if (!empty ($pwd) && $pwd = = $mm)
{
$_session["UID"] = $uid; If the login is successful, put the username in the session to save, jump to the main page
Header ("location:main.php");
}
Else
{
echo "Login failed!";
}

3. Main Page

<?php
Session_Start ();


if (Empty ($_session["UID"]))//Determine if the SESSION is stored in the value, if there is no storage, let it jump to the login interface
{
Header ("location:login.php");
Exit
}

$uid = $_session["UID"]; If you can fetch the user name from the session, the following information is displayed
Include ("DBDA.class.php");
$db = new Dbda ();
$sql = "Select name from users where uid= ' {$uid} '";
$attr = $db->query ($sql);

?>
<body>
<?php
echo "
?>

Third, do shopping cart

1. Information on fruit table

<body>
<table width= "100%" border= "1" cellpadding= "0" cellspacing= "0" >
<tr>
<td> name </td>
<td> Price </td>
<td> Origin </td>
<td> Inventory </td>
<td> Operations </td>
</tr>
<?php
Include ("DBDA.class.php");
$db = new Dbda ();

$sql = "SELECT * from Fruit";
$attr = $db->query ($sql);

foreach ($attr as $v)
{
echo "<tr>
<td>{$v [1]}</td>
<td>{$v [2]}</td>
<td>{$v [3]}</td>
<td>{$v [4]}</td>
<td><a href= ' jia.php?code={$v [0]} ' > Plus shopping cart </a></td>//Add Shopping cart options
</tr> ";
}


?>
</table>

2. Add the fruit to your cart

Three lines of thought:

1. If it is the first time to click on the shopping cart, do a two-dimensional array thrown into the session

2. If it is not the first time you click Add Shopping cart and the fruit is first clicked, make a one-dimensional array of the fruit and throw it into the two-dimensional array of the session

3. If it is not the first time you click on the cart and the fruit is not the first click, add 1 to the number of the fruit in the session array




<?php
Session_Start ();

$code = $_get["code"];

if (Empty ($_session["GWC"]))
{
1. If it is the first time to click on the shopping cart, do a two-dimensional array thrown into the session
$attr = Array (
Array ($code, 1)//Create a two-dimensional array and add the codename and number 1 in an array inside.
);

$_session["GWC"] = $attr; Add the newly created two-dimensional array to the session
}
Else
{
Determine if the fruit designator appears in the session array
$attr = $_session["GWC"]; If there is content in the session, give the content to a two-dimensional array
if (Panduan ($code, $attr))//See Below a Panduan method to determine if the code name is already present in the session
{
3. If it is not the first time you click on the cart and the fruit is not the first click, add 1 to the number of the fruit in the session array
/*foreach ($attr as $v)
{
if ($code = = $v [0])
{
$v [1] = $v [1]+1;
}
}*/
for ($i =0; $i <count ($attr); $i + +)//Take the length of the array with count ()
{
if ($code = = $attr [$i][0])
{
$attr [$i][1]++;
}
}
$_session["GWC"]= $attr;
}
Else
{
2. If it is not the first time you click Add Shopping cart and the fruit is first clicked, make a one-dimensional array of the fruit and throw it into the two-dimensional array of the session
$arr = Array ($code, 1);
$attr [] = $arr;
$_session["GWC"]= $attr;
}

}


Var_dump ($_session["GWC"]);

Determine if V is present in arr
function Panduan ($v, $arr)//Judging method
{
$n = 0;
foreach ($arr as $a)
{
if ($v = = $a [0])
{
$n + +;
}
}

if ($n ==0)
{
return false;
}
Else
{
return true;
}
}

PHP section--session three ways to use

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