<?php
$content = file_get_contents('index.php');
$search = <<<'SQL'
        $stmt = db()->prepare("SELECT p.*, i.customer_id, c.name as customer_name,
                                      o.name as outlet_name, o.address as outlet_address, o.phone as outlet_phone
                               FROM payments p 
                               JOIN invoices i ON p.invoice_id = i.id 
                               LEFT JOIN customers c ON i.customer_id = c.id 
                               LEFT JOIN outlets o ON i.outlet_id = o.id
                               WHERE p.id = ?");
SQL;
$replace = <<<'SQL'
        $stmt = db()->prepare("SELECT p.*, i.customer_id, i.id as inv_id, c.name as customer_name,
                                      o.name as outlet_name, o.address as outlet_address, o.phone as outlet_phone
                               FROM payments p 
                               JOIN invoices i ON p.invoice_id = i.id 
                               LEFT JOIN customers c ON i.customer_id = c.id 
                               LEFT JOIN outlets o ON i.outlet_id = o.id
                               WHERE p.id = ?");
SQL;

$content = str_replace($search, $replace, $content);
file_put_contents('index.php', $content);