$listing_sql is too long (over 1024 char and the query is not correct.

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Hello, i am quite green in PHP but learning .... as always.
I noted a strange behavior in the query below and scratching my head to understand it.
Then i copied the query in phpMyAdmin and noticed that the ". $and ." section was missing.
Checked the string length and it is 1023 bytes !!!
Then I taken out a couples of columns, reduce the length and ... YES it works fine.
Here are the information:

APACHE 2.4.7
MYSQL 5.6.15
PHP 5.5.8

Zip file: zen-cart-v1.5.6c-07162019

File: includes\index_filters\default_filter.php

/**
 * default_filter.php  for index filters
 *
 * index filter for the default product type
 * show the products of a specified manufacturer
 *
 * @package productTypes
 * @copyright Copyright 2003-2019 Zen Cart Development Team
 * @copyright Portions Copyright 2003 osCommerce
 * @todo Need to add/fine-tune ability to override or insert entry-points on a per-product-type basis
 * @license http://www.zen-cart.com/license/2_0.txt GNU Public License V2.0
 * @version $Id: Scott C Wilson 2019 Jun 23 Modified in v1.5.6c $
 */

//
//
//
line 53

$listing_sql = "SELECT " . $select_column_list . " p.products_id, p.products_type, p.master_categories_id, p.manufacturers_id, p.products_price, p.products_tax_class_id, pd.products_description,
                       IF(s.status = 1, s.specials_new_products_price, NULL) AS specials_new_products_price,
                       IF(s.status = 1, s.specials_new_products_price, p.products_price) AS final_price,
                       p.products_sort_order, p.product_is_call, p.product_is_always_free_shipping, p.products_qty_box_status
                FROM " . TABLE_PRODUCTS . " p
                LEFT JOIN " . TABLE_SPECIALS . " s ON s.products_id = p.products_id
                LEFT JOIN " . TABLE_PRODUCTS_DESCRIPTION . " pd ON pd.products_id = p.products_id
                  AND pd.language_id = " . (int)$_SESSION['languages_id'] . "
                LEFT JOIN " . TABLE_PRODUCTS_TO_CATEGORIES . " p2c ON p2c.products_id = p.products_id
                LEFT JOIN " . TABLE_MANUFACTURERS . " m ON m.manufacturers_id = p.manufacturers_id
                WHERE p.products_status = 1
                " . $and . "
                " . $alpha_sort;

Otherwise my system works.

Keep me posted please.
Claudio

There are a couple of conditional sections (if/then/else) in the lines preceding that $listing_sql assignment that determine the values for the $and clause as well as the $alpha_sort. That's why the SELECT clause isn't directly pasteable into phpMyAdmin.

lat9:

There are a couple of conditional sections (if/then/else) in the lines preceding that $listing_sql assignment that determine the values for the $and clause as well as the $alpha_sort. That's why the SELECT clause isn't directly pasteable into phpMyAdmin.

Thank you for the answer, but i pasted the finished query, and that is why i realized that was not complete.
I still thinking that the query is simply too long, i.e. >1024 char.

Why do you think that the 1024 (1K) character length is an issue? If you copy/paste the following query into your site's phpMyAdmin, what is the current setting?

SHOW VARIABLES LIKE 'max_allowed_packet';

lat9:

Why do you think that the 1024 (1K) character length is an issue? If you copy/paste the following query into your site's phpMyAdmin, what is the current setting?

SHOW VARIABLES LIKE 'max_allowed_packet';

hi, 
This is it :
SHOW VARIABLES LIKE 'max_allowed_packet'
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Variable_name 	Value 	
max_allowed_packet 	1048576
====
To answer your question, i have shortened up the query - some fields where not of my interest, and it did worked bang on!

As i said i am quite "green" in PHP / html but i have a long experience in C# and ASM (well this was long ago LOL), so my approach is try and correct. That correction worked but i would like to understand it.

Question: "packet" means data sent or received or includes SQL queries as well?
Thank you for your time.

Claudio_tls:

SHOW VARIABLES LIKE 'max_allowed_packet'

Variable_name Value
max_allowed_packet 1048576
MySQL until 5.6.5: default was 1048576 (1MB)
From 5.6.6 until 8.0.2 default was 4194304 (4M)
Since 8.0.3 default is 67108864 (64M)
https://dev.mysql.com/doc/refman/8.0/en/server-system-variables.html#sysvar_max_allowed_packet

MariaDB:
16777216 (16M) >= MariaDB 10.2.4
4194304 (4M) >= MariaDB 10.1.7
1048576 (1MB) <= MariaDB 10.1.6
https://mariadb.com/kb/en/library/server-system-variables/#max_allowed_packet

You can safely increase your default setting to a more modern value.