Pass session variable to new page when link is clicked
I'm having a bit of trouble with this. I have a search results page of books with various links, all linking to the same page (book.php) and I want to set a session variable to pass through to the new page which should display more info about the specific result link that is selected. I am trying to pass the variable $_SESSION['booktitle'] through to book.php when the link in the while loop is selected. The code of the search results page is:
<form id="rform" name="formsort" action="" method="post">
<select name="sort" id="sort" onChange="document.forms['formsort'].submit()">
<option value="default">Sort Results</option>
<option value="lowhigh">Price: Low to High</option>
<option value="highlow">Price: High to Low</option>
<option value="az">Alphabetical Order: A-Z</option>
<option value="za">Alphabetical Order: Z-A</option>
</select>
<?php
if(isset($_POST['title']))
{
echo '<input type="hidden" name="title" value="'.$_POST['title'].'" />';
}
if(isset($_POST['author']))
{
echo '<input type="hidden" name="author" value="'.$_POST['author'].'" />';
}
if(isset($_POST['isbn']))
{
echo '<input type="hidden" name="isbn" value="'.$_POST['isbn'].'" />';
}
if(isset($_POST['keyword']))
{
echo '<input type="hidden" name="keyword" value="'.$_POST['keyword'].'" />';
}
?>
</form>
<?php
include "include.php";
session_start();
// Defining variables from home.php if set
$title = mysql_real_escape_string($_POST['title']);
$author = mysql_real_escape_string($_POST['author']);
$isbn = mysql_real_escape_string($_POST['isbn']);
$keyword = mysql_real_escape_string($_POST['keyword']);
if(isset($_POST['sort'])){
$sort=@$_POST['sort'];}
// Determine the WHEREs to use
$where = array();
if ( ! empty($title))
$where[] = "booktitle LIKE '%" . $title . "%'";
if ( ! empty($author))
$where[] = "author LIKE '%" . $author . "%'";
if ( ! empty($isbn))
$where[] = "isbn LIKE '%" . $isbn . "%'";
if ( ! empty($keyword))
$where[] = "description LIKE '%" . $keyword . "%'";
//Determine the ORDERs to use
$order = array();
if ((isset($sort)) && ($sort=='lowhigh'))
$order[] = "price ASC";
if ((isset($sort)) && ($sort=='highlow'))
$order[] = "price DESC";
if ((isset($sort)) && ($sort=='az'))
$order[] = "booktitle ASC";
if ((isset($sort)) && ($sort=='za'))
$order[] = "booktitle DESC";
// Build the query
$query = 'SELECT * FROM book';
if ( ! empty($where))
$query .= ' WHERE ' . implode(' AND ', $where);
if(! empty($sort))
$query .= ' ORDER BY ' . implode($order);
//Display results
$result = mysqli_query($con, $query) or die("Error in query $query: " . mysqli_error());
while ($row = mysqli_fetch_array($result)) {
?><a id="1" href="book.php" border="0"><img src="<?php echo $row[12]; ?>" width="112px" height="150px" /></a>
<a href="book.php?booktitle='<?php echo $_SESSION['booktitle']=$row[1];?>'"><b><?php echo $row[1] . ", (" . $row[5] . ")";?></b></a><br><?php
echo $row[2];
echo "<br><div style='text-align:right'> <b>£" . $row[9] . "</b></div>";
echo "<b>Book description:</b> " . substr($row[3],0,300) . "...<br /><hr>";
}
mysqli_close($con); //closes the connection
?>
and I call it in book.php using:
<?php
include "include.php";
session_start();
$book=$_SESSION['booktitle'];
$query = "SELECT * FROM book WHERE booktitle='$book'";
$result = mysqli_query($con, $query) or die("Error in query $query: " . mysqli_error());
while ($row = mysqli_fetch_array($result)) {
echo $row[1];
} ?>
But no matter what book link I select, the booktitle of the 1st search result in the while loop is being echoed out. Any idea why?
Any help would be greatly appreciated.
Replace
$book=$_SESSION['booktitle'];
With
$book=$_GET['booktitle'];
You can get booktitle from link using GET method.
Instead of using $row[1] replace it with $row['booktitle']
I hope that i can offer you my maximum help .
First of all i want to understand what is the file name where the first block exists if the second block is book.php ?
Then i want to suggest that you use the session_start() in the top of your code to eliminate any "header warnings" .
Then i want from you to explain to me why you put in your code this instruction
<?php echo $_SESSION['booktitle']=$row[1]?>
why you don't write it as :
<?php
$_SESSION['booktitle'] = $row[1];
echo $_SESSION['booktitle'];
?>
Then always after echoing a $_SESSION['variable'] that is needed just for one time do an unset() for it after echoing it directly look like this in your case unset($_SESSION['booktitle']);
What i think that your new booktitle search is not stored in a new session during the above code and the old search result is just stored try to apply these modifications and tell me if it is solved :)
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