How to compare data from two tables - php

Question

I have two database (mysql) with the same structure. I want to:
compare data in two table. Table one - home and the second work,
send email with results,
update data in table work.
My query:
select id, code, quantity from wpx_products
I run this query in table home and work (two databases). And this is output:
"3";"home 005-07";"2"
"63";"home 033-12";"2"
"15";"home 005-19";"2"
and from work:
"1";"work 005-07";"2"
"2";"work 033-12";"5"
"3";"work 005-19";"2"
What I want to do ? What I mean by "compare" ? I want find record with excluding tag work or home in column 'code'. For example I want to find 033-12 and check quantity. If the difference copy value from home to work.
In first second I want to use trigger in mysql. But this is not solution for me because I cant run it by myself and I can't send email with results. What is the best way to achieve this functionality ? Thanks for help.
Kind regards
---------------------edit----------------------------
I check this code below (thanks #AntG). And I have one problem. When I print
foreach ($result_target AS $target) {
$code_target = substr($target['code'], 4);
if ($code_source === $code_target) {
if ($source['quantity'] !== $target['quantity']) {
print $source['quantity'] .' -> ' . $target['quantity']."<br /><br />";
$match[] = array('code' => $source['code'], 'quantity' => $source['quantity'], 'targetid' => $target['id'], 'sourceid' => $source['id']);
}
$found = true;
break;
}
}
I have this results: http://suszek.info/projekt1/ Like You see there is 50 values. When I print $match there is much more, duplicated value and I don't know why ?
$msg = '';
foreach ($match AS $entry) {
$msg .= 'Change identified: Home_ID=' . $entry['sourceid'] . ' code: ' . $entry['code'] . ' quantity:' . $entry['quantity'] . PHP_EOL . '<br />';
print $msg;
/* Perform DB updates using $entry['targetid'] and $entry['quantity'] */
}
I have this results: http://suszek.info/projekt1/index_1.php And all code:
$match = array(); $new = array();
foreach ($result_source AS $source) {
$found = false;
$code_source = substr($source['code'], 4);
foreach ($result_target AS $target) {
$code_target = substr($target['code'], 4);
if ($code_source === $code_target) {
if ($source['quantity'] !== $target['quantity']) {
print $source['quantity'] .' -> ' . $target['quantity']."<br /><br />";
$match[] = array('code' => $source['code'], 'quantity' => $source['quantity'], 'targetid' => $target['id'], 'sourceid' => $source['id']);
}
$found = true;
break;
}
}
if (!$found) {
$new[] = array('code' => $source['code'], 'quantity' => $source['quantity'], 'sourceid' => $source['id']);
} } $msg = ''; foreach ($match AS $entry) {
$msg .= 'Change identified: Home_ID=' . $entry['sourceid'] . ' code: ' . $entry['code'] . ' quantity:' . $entry['quantity'] . PHP_EOL
. '<br />';
print $msg;
/* Perform DB updates using $entry['targetid'] and $entry['quantity'] */ }
foreach ($new AS $entry) {
$msg .= 'New Entry: Home_ID=' . $entry['sourceid'] . ' code: ' . $entry['code'] . ' quantity:' . $entry['quantity'] . PHP_EOL . '<br
/>';
#print $msg;
/* Perform DB inserts using $entry['code'] and $entry['quantity'] if this is desired behaviour */ }
/* Send email with $msg */

Answer 1

If you are capturing both query results in a $results array, then I think substr() is the PHP function that you are after here:
$match=array();
$new=array();
foreach($results_home AS $home)
{
$found=false;
$code=substr($home['code'],5);
foreach($results_work AS $work)
{
if($code===substr($work,5))
{
if($home['quantity']!==$work['quantity'])
{
$match[]=array('code'=>$home['code'],'quantity'=>$home['quantity'],'workid'=>$work['id'],'homeid'=>$home['id']);
}
$found=true;
break;
}
}
if(!$found)
{
$new[]=array('code'=>$home['code'],'quantity'=>$home['quantity'],'homeid'=>$home['id']);
}
}
$msg='';
foreach($match AS $entry)
{
$msg.='Change identified: Home_ID='.$entry['homeid'].' code: '.$entry['code'].' quantity:'.$entry['quantity'].PHP_EOL;
/* Perform DB updates using $entry['workid'] and $entry['quantity'] */
}
foreach($new AS $entry)
{
$msg.='New Entry: Home_ID='.$entry['homeid'].' code: '.$entry['code'].' quantity:'.$entry['quantity'].PHP_EOL;
/* Perform DB inserts using $entry['code'] and $entry['quantity'] if this is desired behaviour */
}
/* Send email with $msg */