I have a mysql table that gets data inserted and deleted using the forms on my php pages. That all works. Now I want the users to be able to view index.php (homepage which displays the table and all its data) but if they click delete or add it must ask them to login before the add.php or delete.php pages are shown to them. I have written a login.php script below but am unsure how to force the page to check it before letting them through. Also if the user does login, will it take him to the page he clicked on or just back to index.php
EDIT Updated the Code As requested
login.php
<?php
if (isset($_SESSION['SESS_MEMBER_ID']) && !empty($_SESSION['SESS_MEMBER_ID'])) {
header("location:add.php"); // if user is logged in don't show the form take them were they need to be
} else {
?>
<?php
//Start session
session_start();
//Unset the variables stored in session
unset($_SESSION['SESS_MEMBER_ID']);
unset($_SESSION['SESS_FIRST_NAME']);
unset($_SESSION['SESS_LAST_NAME']);
?>
<form name="loginform" action="login_exec.php" method="post">
<table width="309" border="0" align="center" cellpadding="2" cellspacing="5">
<tr>
<td colspan="2">
<!--the code bellow is used to display the message of the input validation-->
<?php
if( isset($_SESSION['ERRMSG_ARR']) && is_array($_SESSION['ERRMSG_ARR']) && count($_SESSION['ERRMSG_ARR']) >0 ) {
echo '<ul class="err">';
foreach($_SESSION['ERRMSG_ARR'] as $msg) {
echo '<li>',$msg,'</li>';
}
echo '</ul>';
unset($_SESSION['ERRMSG_ARR']);
}
?>
</td>
</tr>
<tr>
<td width="116"><div align="right">Username</div></td>
<td width="177"><input name="username" type="text" /></td>
</tr>
<tr>
<td><div align="right">Password</div></td>
<td><input name="password" type="text" /></td>
</tr>
<tr>
<td><div align="right"></div></td>
<td><input name="" type="submit" value="login" /></td>
</tr>
</table>
</form>
<?php
}
?>
Login_exec.php
<?php
//Start session
session_start();
//Include database connection details
require_once('connection.php');
//Array to store validation errors
$errmsg_arr = array();
//Validation error flag
$errflag = false;
//Function to sanitize values received from the form. Prevents SQL injection
function clean($str) {
$str = @trim($str);
if(get_magic_quotes_gpc()) {
$str = stripslashes($str);
}
return mysql_real_escape_string($str);
}
//Sanitize the POST values
$username = clean($_POST['username']);
$password = clean($_POST['password']);
//Input Validations
if($username == '') {
$errmsg_arr[] = 'Username missing';
$errflag = true;
}
if($password == '') {
$errmsg_arr[] = 'Password missing';
$errflag = true;
}
//If there are input validations, redirect back to the login form
if($errflag) {
$_SESSION['ERRMSG_ARR'] = $errmsg_arr;
session_write_close();
header("location: login.php");
exit();
}
//Create query
$qry="SELECT * FROM member WHERE username='$username' AND password='$password'";
$result=mysql_query($qry);
//Check whether the query was successful or not
if($result) {
if(mysql_num_rows($result) > 0) {
//Login Successful
session_regenerate_id();
$member = mysql_fetch_assoc($result);
$_SESSION['SESS_MEMBER_ID'] = $member['mem_id'];
$_SESSION['SESS_FIRST_NAME'] = $member['username'];
$_SESSION['SESS_LAST_NAME'] = $member['password'];
session_write_close();
header("location: index.php");
exit();
}else {
//Login failed
$errmsg_arr[] = 'user name and password not found';
$errflag = true;
if($errflag) {
$_SESSION['ERRMSG_ARR'] = $errmsg_arr;
session_write_close();
header("location: login.php");
exit();
}
}
}else {
die("Query failed");
}
?>
index.php
<center>
<html>
<head>
<title>Extension List</title></head><body>
<?php
$db_host = 'localhost';
$db_user = 'root';
$db_pwd = '****';
$database = 'list';
$table = 'users';
if (!mysql_connect($db_host, $db_user, $db_pwd))
die("Can't connect to database");
if (!mysql_select_db($database))
die("Can't select database");
// sending query
$result = mysql_query("SELECT * FROM {$table}");
if (!$result) {
die("Query to show fields from table failed");
}
$fields_num = mysql_num_fields($result);
echo "<table border='1'><tr>";
// printing table headers
for($i=0; $i<$fields_num; $i++)
{
$field = mysql_fetch_field($result);
echo "<td>{$field->name}</td>";
}
echo "</tr>
";
// printing table rows
while($row = mysql_fetch_row($result))
{
echo "<tr>";
// $row is array... foreach( .. ) puts every element
// of $row to $cell variable
foreach($row as $cell)
echo "<td>$cell</td>";
echo "</tr>
";
}
mysql_free_result($result);
?>
<br>
<h1> Alpine Motors Extension List</h1>
<h2><a href="add.php">Add Extension</a>
<br>
<br>
<a href="delete.php"> Delete Extension</a></h2>
<br> <br>
</h3>
</body>
</html>
</center>
<?php
}
?>
delete.php
<?php
require ("database.php");
?>
<?php
$this_Stud_ID =$_REQUEST['id'];
// sending query
mysql_query("DELETE FROM users WHERE id = '$this_Stud_ID'")
or die(mysql_error());
if($_POST['action'])
header("Location: index.php");
?>
<center><form action="<?php echo $_SERVER['php_self'] ?>" method="post">
Enter ID Number :<br><input type="text" name="id"><br />
<br><input type="submit" name="action" value="Delete!">
<br> <br>
<h3>
<a href="index.php"> Main Menu </a>
</h3>
</form>
</center>
