Help building / using array


Posted on 16th Feb 2014 07:03 pm by admin

First - this is a cross-posting, if this is wrong I apologise! What started out as a MySQL query question (original post http://www.phpfreaks.com/forums/index.php/topic,273323.0.html) has become a PHP coding question....

I have 2 tables - docs and doc_relationships: -

+-------------+--------------+---Table: docs-----+-----------+---------------------+---------+
| document_id | doctype | location | title | thumbnail | added | visible |
+-------------+--------------+-----------+-------+-----------+---------------------+---------+
| 1 | instructions | pdf/a.pdf | a | img/a.jpg | 2001-04-12 20:16:58 | Y |
+-------------+--------------+-----------+-------+-----------+---------------------+---------+
| 2 | pressrelease | pdf/b.pdf | b | img/b.jpg | 2002-04-09 20:18:33 | Y |
+-------------+--------------+-----------+-------+-----------+---------------------+---------+
| 3 | newsletter | pdf/c.pdf | c | img/c.jpg | 2003-05-21 11:18:54 | Y |
+-------------+--------------+-----------+-------+-----------+---------------------+---------+
| 4 | instructions | pdf/x.pdf | x | img/x.jpg | 2004-01-22 19:13:21 | Y |
+-------------+--------------+-----------+-------+-----------+---------------------+---------+
| 5 | pressrelease | pdf/y.pdf | y | img/y.jpg | 2005-02-17 17:11:17 | Y |
+-------------+--------------+-----------+-------+-----------+---------------------+---------+
| 6 | instructions | pdf/z.pdf | z | img/z.jpg | 2006-07-02 12:15:58 | Y |
+-------------+--------------+-----------+-------+-----------+---------------------+---------+
| 7 | pressrelease | pdf/p.pdf | p | img/p.jpg | 2002-03-01 18:31:26 | Y |
+-------------+--------------+-----------+-------+-----------+---------------------+---------+


+-------Table: doc_relationships-----+
| rel_id | document_id | product_id |
+--------+--------------+------------+
| 1 | 1 | 4 |
+--------+--------------+------------+
| 2 | 2 | 3 |
+--------+--------------+------------+
| 3 | 4 | 3 |
+--------+--------------+------------+
| 4 | 6 | 2 |
+--------+--------------+------------+
| 5 | 7 | 3 |
+--------+--------------+------------+

Each row in the doc_relationships table ties one document to a product_id (product_ids are held in another table and will be hardcoded), the above example gives: -

doc 1: instructions, product 4
doc 2: pressrelease, product 3
doc 3: newsletter
doc 4: instructions, product 3
doc 5: pressrelease
doc 6: instructions, product 2
doc 7: pressrelease, product 3

Each product can have any number of Instructions, Press Releases and Newsletters related to it.
Press Releases and Newsletters can be related to one or more product.
Instruction manuals are usually related to one product only.

So far I have three pages - newsletters, pressreleases and instructions, which simply list all the matching documents, using this query: -

Code: $query="SELECT * FROM docs WHERE doctype='newsletter' AND visible='Y' ORDER BY added DESC, document_id DESC";

The problem is I also want to list any relevant documents on product pages, under headings referrring to doc types, so for example on product 3's page: -

-----------------------------------------------------------------------------------------
Product #3 - Super Widget

Desription - this is a remarkable widget, you'll wonder how you ever managed without one!

Instructions:
(link to doc 4)

Press Releases: -
(link to doc 2)
(link to doc 7)
-----------------------------------------------------------------------------------------

The query I'm using for the product pages is as follows: -

Code:
$query="SELECT * FROM docs, doc_relationships WHERE doc_relationships.document_id=docs.document_id AND doc_relationships.product_id='3' AND visible='Y' ORDER BY docs.added DESC, docs.document_id DESC";


I could add another condition to this query for "doctype" and do it 3 times, once for each doctype, but ideally what I'd like to do on a product page is create 3 arrays (newsletters, pressreleases & instructions) containing the details of each for that product (if any). So here's what I have so far: -

Code: // connect to database and issue the query
mysql_connect($server,$dbusername,$dbpassword);
@mysql_select_db($db_name) or die( "Unable to select database");
$query="SELECT * FROM docs, doc_relationships WHERE doc_relationships.document_id=docs.document_id AND doc_relationships.product_id='3' AND visible='Y' ORDER BY docs.added DESC, docs.document_id DESC";
$all_documents=mysql_query($query);
$total_docs=mysql_num_rows($all_documents);
mysql_close();

if ($total_docs != 0) {
while ($sql = mysql_fetch_object($all_documents)) {
if ($sql -> doctype=='newsletter'){
echo 'document #' . $sql -> document_id . ' is a newsletter<br />';
// create the newsletters array if it doesnt exist
if (!is_array($newsletters)) $newsletters= array();
// add to newsletters array;
array_push($newsletters, $sql);
} else if ($sql -> doctype=='pressrelease'){
echo 'document #' . $sql -> document_id . ' is a pressrelease<br />';
// create the pressreleases array if it doesnt exist
if (!is_array($pressreleases)) $pressreleases= array();
// add to pressreleases array;
array_push($pressreleases, $sql);
} else if ($sql -> doctype=='instructions'){
echo 'document #' . $sql -> document_id . ' is instructions<br />';
// create the instructions array if it doesnt exist
if (!is_array($instructions)) $instructions array();
// add to instructions array;
// not quite sure how!
array_push($instructions, $sql);
}
}
}

print_r($instructions);

As you can see, I added some test echos and this works as expected. The result of the final print_r($instructions) command is: -

QuoteArray ( => stdClass Object ( [document_id] => 4 [doctype] => instructions [location] => pdf/x.pdf [title] => x [thumbnail] => img/x.jpg [added] => 2004-01-22 19:13:21 [visible] => Y [rel_id] => 3 [product_id] => 3 ) ) The problem is I can't seem to extract the data from this array individually, for example I thought: -

Code: echo $instructions[0]['document_id'];

would echo '4' but it doesn't (and actually stops the page output dead).

So: -

1) Am I inserting results into the arrays correctly?

2) How do I access individual document info from each array?

3) How do I (for each array) loop through all documents?

No comments posted yet

Your Answer:

Login to answer
280 Like 42 Dislike
Previous forums Next forums
Other forums

switch form actions? not working
i want on submit to go to different pages according to the CatID

Code: <?php $CatID=$_

Can't shake the "Warning: include()" error
I've just uploaded my site to a new server and where I have PHP include tags in my HTML, the browser

php global variable
how can we create global variable so we can use its value in any form.. Please give example to

Wierd echo error?
Hi, i got the most wierd php error ever and i don't know why..
Code: echo "<t

split string
Hi all

i have some names (imploded by comma):
Code: toronto,paris,madrid
Now, i would

problem in pagination when processing with selectbox form
Hi,

I have a search form, with select boxes, if am selecting the value from the form, it work

Renaming a file that a user uploads to site?
My site allows for registered users to upload images to the site under their own gallery. Currently

$_POST variable un-useable
I'm trying to use a $_POST variable in a mysql update statement but i can't use it for some unknown

PDO returns erroneous columns from within pdt
Hi All,

This is a truly weird behavior:
When using a simple pdo fetch, erroneous columns a

There was a problem with the request. (Code: 0)
Any Idea what could cause this? I get it randomly at best. But with both IE and FF. It derives from

Sign up to write
Sign up now if you have flare of writing..
Login   |   Register
Follow Us
Indyaspeak @ Facebook Indyaspeak @ Twitter Indyaspeak @ Pinterest RSS



Play Free Quiz and Win Cash