PHP - Issue Connecting To Multiple Databases

<form action="private-add-insert.php" method="post" enctype="multipart/form-data">
Car Make: <input type="text" name="make">
Car Model: <input type="text" name="model">
Exterior Colour: <input type="text" name="exteriorcolour">
Engine Size: <input type="text" name="enginesize">
Fuel Type: <input type="text" name="fueltype">
Year Registered: <input type="text" name="yearregistered">
Transmission: <input type="text" name="transmission">
Mileage: <input type="text" name="mileage">
Number of Doors: <input type="text" name="nodoors">
Body Style: <input type="text" name="bodystyle">
Price: <input type="text" name="price">
<br>
<label>Upload Images</label>
<input type="file" name="image[]" multiple/>
<br />
<input type="hidden" name="MAX_FILE_SIZE" value="100000" />
<br />
<input type="submit" value="Submit Listing"> 
</form>

<?php
ini_set('display_startup_errors',1);
ini_set('display_errors',1);
error_reporting(-1);
?>

<?php
// Start a session for error reporting
session_start();

// Call our connection file
require("includes/conn.php");

// Check to see if the type of file uploaded is a valid image type
function is_valid_type($file)
{
	// This is an array that holds all the valid image MIME types
	$valid_types = array("image/jpg", "image/jpeg", "image/bmp", "image/gif", "image/png");

	if (in_array($file['type'], $valid_types))
		return 1;
	return 0;
}

// Just a short function that prints out the contents of an array in a manner that's easy to read
// I used this function during debugging but it serves no purpose at run time for this example
function showContents($array)
{
	echo "<pre>";
	print_r($array);
	echo "</pre>";
}

// Set some constants

// This variable is the path to the image folder where all the images are going to be stored
// Note that there is a trailing forward slash
$TARGET_PATH = "private-listing-images/";

// Get our POSTed variables
$make = $_POST['make'];
$model = $_POST['model'];
$exteriorcolour = $_POST['exteriorcolour'];
$enginesize = $_POST['enginesize'];
$fueltype = $_POST['fueltype'];
$yearregistered = $_POST['yearregistered'];
$transmission = $_POST['transmission'];
$mileage = $_POST['mileage'];
$nodoors = $_POST['nodoors'];
$bodystyle = $_POST['bodystyle'];
$price = $_POST['price'];
$image = $_FILES['image'];

// Sanitize our inputs
$make = mysql_real_escape_string($make);
$model = mysql_real_escape_string($model);
$exteriorcolour = mysql_real_escape_string($exteriorcolour);
$enginesize = mysql_real_escape_string($enginesize);
$fueltype = mysql_real_escape_string($fueltype);
$yearregistered = mysql_real_escape_string($yearregistered);
$transmission = mysql_real_escape_string($transmission);
$mileage = mysql_real_escape_string($mileage);
$nodoors = mysql_real_escape_string($nodoors);
$bodystyle = mysql_real_escape_string($bodystyle);
$price = mysql_real_escape_string($price);
$image['name'] = mysql_real_escape_string($image['name']);

// Build our target path full string.  This is where the file will be moved do
// i.e.  images/picture.jpg
$TARGET_PATH .= $image['name'];

// Check to make sure that our file is actually an image
// You check the file type instead of the extension because the extension can easily be faked
if (!is_valid_type($image))
{
	$_SESSION['error'] = "You must upload a jpeg, gif, bmp or png";
	header("Location: private-add-listing.php");
	exit;
}

// Lets attempt to move the file from its temporary directory to its new home
if (move_uploaded_file($image['tmp_name'], $TARGET_PATH))
{
	
	// NOTE: This is where a lot of people make mistakes.
	// We are *not* putting the image into the database; we are putting a reference to the file's location on the server
	$sql = "insert into privatelistings (make, model, exteriorcolour, enginesize, fueltype, yearregistered, transmission, mileage, nodoors, bodystyle, price, filename) values ('$make', '$model', '$exteriorcolour', '$enginesize', '$fueltype', '$yearregistered', '$transmission', '$mileage', '$nodoors', '$bodystyle', '$price', '" . $image['name'] . "')";
	$result = mysql_query($sql) or die ("Could not insert data into DB: " . mysql_error());
	header("Location: private-add-listing-successfully.php?msg=Listing Added successfully");
	exit;
}
else
{
	// A common cause of file moving failures is because of bad permissions on the directory attempting to be written to
	// Make sure you chmod the directory to be writeable
	$_SESSION['error'] = "Could not upload file.  Check read/write persmissions on the directory";
	header("Location: private-add-listing.php");
	exit;
}
?>

Let me explain my problem. I have an array with dates and numbers in format ($cronograma)

Ex:

Array ( [2020-09-21] => Array ( [0] => 2020-09-21 [1] => 2 [2] => 2 [3] => 2 ) [2020-09-28] => Array ( [0] => 2020-09-28 [1] => 2 [2] => 2 [3] => 4 )

Then i have another array with 2 ids (in this case 58,60) ($id)

Finally i have a third array with numbers only (in this case 34,34) $tot

So what i want is cross information beween them, for example for id 58 I must get dates (first element and last element when $tot = 34) for id 60 I must get dates (first element after $tot =34 and last element of array)

Whath i have so far is this

foreach ($id as $idPlan) { foreach ($cronograma as $c) { $t1 = 0; foreach ($tot as $d) { $t1 += (int)$d['tempos']; if ($c[3] == $t1) { $newAr[] =$idPlan; $newAr[] = $c[0]; } } } }

My response

array(8) { [0]=> string(2) "58" [1]=> string(10) "2021-02-01" [2]=> string(2) "58" [3]=> string(10) "2021-06-14" [4]=> string(2) "60" [5]=> string(10) "2021-02-01" [6]=> string(2) "60" [7]=> string(10) "2021-06-14" } null

So it's clear that i have all repeated

I should have a line like:

58 - 2020-09-21 -2021-02-01

Any help?

<?php 

// Get required login info
include "/path/to/login/info/file.php"; // Get required login info - changed for this post.

$db = new mysqli('localhost', $username, $password, $database); // Connect to DB using required login info
if($db->connect_errno > 0){
    die('Unable to connect to database [' . $db->connect_error . ']');
}

unset($username);// put these variables back to null
unset($password);// put these variables back to null
unset($database);// put these variables back to null


//query db
$sql = <<<SQL
    SELECT *
    FROM `ft_form_7`
	WHERE DATE(class_start_date) >= CURDATE()
	OR DATE(class_end_date) >= CURDATE()
	ORDER BY class_start_date ASC
SQL;

if(!$result = $db->query($sql)){ // if there is an error in running the query, show error message.
    die('There was an error running the query [' . $db->error . ']');
}

while($row = $result->fetch_assoc()){
	// Get start date information
	$start_date = $row['class_start_date']; // Get event_start_date for conversion and call it $start_date
	$start_date_formatted = date("l M d, Y", strtotime($start_date)); // Convert start_date 
	$end_date = $row['class_end_date']; // Get event_end_date for conversion and call it $start_date
	$end_date_formatted = date("M d, Y", strtotime($end_date)); // Convert start_date
	
	// Get time information.
	$start_time = $row['class_start_time']; // Get event_start_time for conversion and call it $start_time
	$start_time_formatted = date("h:i A", strtotime($start_time)); // Convert start_time 
	$end_time = $row['class_end_time']; // Get event_end_time for conversion and call it $end_time
	$end_time_formatted = date("h:i A", strtotime($end_time)); // Convert end_time 
	
	// echo information...
	    echo "<h2>" , $row['class_name'],"</h2>" ; // echo event name
	    echo "<p><strong>",$start_date_formatted; // echo the start date
		if (empty($start_time)) { echo ''; } else { echo " (", $start_time; } // echo start time
		if (empty($end_date)) { echo ''; } else { echo " -","<br />", $end_date_formatted; } // echo end date
		if (empty($end_time)) { echo ')'; } else { echo " - ", $end_time, ")"; } // echo end time
	// if there is no start time, echo nothing. (otherwise it seems to echo 4pm). If it does contain a time, echo the time.
	echo "</strong><br />";

	$chef = $row['Instructor'];
	global $chef;
	
	if ($chef != NULL) {
		require ('instructors.php'); }
	echo $row['class_description'], "<br />";
	echo "<strong>" , $row['type'], "&nbsp;-&nbsp;Cost: &#36;",$row['cost'] , " - #" , $row['course_number'] , "</strong><br />" , "</p>"; // echo class type and cost
}

$db->close();
$result->free();

?>

<?php

include "/path/to/login/info/file.php"; // Get required login info - changed for this post.

$db_instructors = new mysqli('localhost', $username, $password, $database); // Connect to DB using required login info
if($db_instructors->connect_errno > 0){
    die('Unable to connect to database [' . $db_instructors->connect_error . ']');
}

unset($username);// put these variables back to null
unset($password);// put these variables back to null
unset($database);// put these variables back to null

//query db
$sql_instructors = <<<SQL
    SELECT *
    FROM ft_form_8
    WHERE chef_name = '$chef'
SQL;

if(!$result_instructors = $db_instructors->query($sql_instructors)) { // if there is an error in running the query, show error message.
    die('There was an error running the query [' . $db_instructors->error . ']');
}

	while($row_instructors = $result_instructors->fetch_assoc()) {
	$chef_full_name = $row_instructors['chef_name'];
	$chef_id = $row_instructors['submission_id'];
	$full_bio = $row_instructors['full_bio'];
	echo "<a href=\"#\" class=\"clickme\">" , $chef_full_name , "</a>";
	echo "<div class=\"box\">";
	echo $full_bio , "</div>";
}


$db_instructors->close();
$result_instructors->free();

?>