Undefined variable, and invalid argument - php

Question

I'm trying to link my array of customers to my table to output them in the table appropriately, but I'm getting these errors. Notice: Undefined variable: customers in C:\wamp\www\son line 67
Warning: Invalid argument supplied for foreach() in C:\wp on line 67
Am I going about this totally wrong, it seems like a simple task, but I'm lost.
my cu

Answer 1

The method readCustomers is not correct. Try something like this:
class Customers{
public function readCustomers()
{
$handle = fopen("inputfile.txt", "r") or die("Failed to create file");
if ($handle) {
while (($line = fgets($handle)) !== false) {
$pieces_of_line = explode(',', $line);
//do whatever you like with the pieces
}
} else {
// error opening the file.
}
fclose($handle);
}
}
Try also something similar with readOrders

Answer 2

First of all, you need to return something from your read functions within your class.
They MUST be static in this case.
class Customers{
public static function readCustomers()
{
$array_of_lines = explode("\n", file_get_contents('customers.txt'));
$pieces_of_line = [];
foreach($array_of_lines as $line) {
$pieces_of_line[] = explode(',', $line);
}
return $pieces_of_line;
}
}
Do the same thing with the Orders class.
And then where you loop through $customers you have to do this first:
$customers= Customers::readCustomers();
foreach ($customers as $cust) {
echo '<tr>';
echo '<td><a href="chapter10-project03.php?customer="'.$cust[0].'></a></td>';
echo '<td>' .$cust[1] . '</td>';
echo '<td>' .$cust[2] .' ' $cust[3] . '</td>';
echo '<td>' .$cust[5] . '</td>';
echo '<td>' .$cust[4] .'</td>';
echo '<td>' .$cust[6] .'</td>';
echo '<td>' .$cust[7] . '</td>';
echo '<td>' .$cust[8] . '</td>';
echo '<td>' .$cust[9] . '</td>';
echo '</tr> ';
}