Getting Error in the following php code - php

Question

$db contains the connection to the database.
I am getting the Error in The foreach statement.
Error Message :
Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[HY093]: Invalid parameter number' in /home/a5057270/public_html/insert2.php:33 Stack trace: #0 /home/a5057270/public_html/insert2.php(33): unknown() #1 {main} thrown in /home/a5057270/public_html/insert2.php on line
Here's The PHP code :
$date = $_GET['date'];
$time = $_GET['time'];
$mode = $_GET['mode'];
$tfno = $_GET['tfno'];
$params = array(':date' => $date);
$query = "SELECT * FROM cabs WHERE DATE=':date' ";
if ($mode!=='' || $mode!=="") {
$query .="AND MODE=':mode' ";
$params[':mode'] = $mode;
}
if ($tfno!=='') {
$query .="AND TFNO=':tfno' ";
$params[':tfno'] = $tfno;
}
$query .="ORDER BY TIME";
$req = $db->prepare($query);
$req->execute($params);
//Build Result String
$display_string = "<article class='container box style3'><section><header><h3><u><b>Here Are The Results...!!</u></b></h3></header><div class='table-wrapper'><table class='default'><thead><tr><th>ID</th><th>Name</th><th>Description</th><th>Contact No.</th></tr></thead><tbody>";
// Getting Error in the line Below
foreach ($req as $row) {
$display_string .="<tr><td>" . $row[IDNO] . "</td><td>" . $row[NAME] . "</td><td><ul><li> Date : " . $row[DATE] . "</li><li> Time : " . $row[TIME] . "</li><li>
Train/Flight No. " . $row[TFNO] . "</li></ul></td><td>" . $row[CONTACT] . "</td></tr>";
}
$display_string .= "</table>";

Answer 1

that's because you are putting '' around your PDO vars...
remove them and all is good. example: make ':mode' => :mode with no '' and it will work.
$params = array(':date' => $date);
$query = "SELECT * FROM cabs WHERE DATE=:date "; //No '' here
if ($mode!=='' || $mode!=="") {
$query .="AND MODE=:mode "; //No '' here
$params[':mode'] = $mode;
}
if ($tfno!=='') {
$query .="AND TFNO=:tfno ";//No '' here
$params[':tfno'] = $tfno;
}