What's wrong with this php foreach code? (merged array) - php

Question

$db = new PDO("mysql:host=$hostname;dbname=$database", $username, $password);
$items = 'SELECT items FROM menus';
$itemLink = 'SELECT itemLink FROM menus';
$itemQuery = $db->query($items);
$linkQuery = $db->query($itemLink);
$fetchItem = $itemQuery->fetch(PDO::FETCH_ASSOC);
$fetchLink = $linkQuery->fetch(PDO::FETCH_ASSOC);
$merged = array_merge($fetchItem,$fetchLink);
foreach($merged as $key=>$value){
echo "${key} => ${value} <br />";
}
This is what it looks like in the database:
items |itemLink
----------------------
Kill Bill|Kill Bill link
Preman |Preman link
So, the expected output, or at least what I thought must be this:
items => Kill Bill
items => Preman
itemLink => Kill Bill Link
itemLink => Preman Link
But the resulted output from the code is this:
items => Kill Bill
itemLink => Kill Bill Link
It's missing the other items and itemLink
So, how do I achieve the output that I want?

Answer 1

$fetchItem = $itemQuery->fetch(PDO::FETCH_ASSOC);
$fetchLink = $linkQuery->fetch(PDO::FETCH_ASSOC);
This only fetches the first row of each resultset. You need fetchAll:
$fetchItem = $itemQuery->fetchAll(PDO::FETCH_ASSOC);
$fetchLink = $linkQuery->fetchAll(PDO::FETCH_ASSOC);
and adjust the rest of your code.
foreach($merged as $entry) {
foreach( $entry as $key => $value ) {
echo "${key} => ${value} <br />";
}
}
EDIT:
The call of fetch only retrieved the first row of the resultset, whereas fetchAll parses the complete resultset into an Array. So the Objects look like this afterwards:
Array(
[0] => { 'items' => 'Kill Bill' },
[1] => { 'items' => 'Preman' }
)
Array(
[0] => { 'itemLink' => 'Kill Bill' },
[1] => { 'itemLink' => 'Preman' }
)
array_merge concatenate both arrays to the following:
Array(
[0] => { 'items' => 'Kill Bill' },
[1] => { 'items' => 'Preman' },
[2] => { 'itemLink' => 'Kill Bill' },
[3] => { 'itemLink' => 'Preman' }
)
So we now have a two dimensional array. To traverse the values we need first to select each $entry, which is done in the outer foreach and can afterwards access the key/value structure in the inner foreach.
As pointed out in the other comment: If you want to preserve the connection between itemsand itemLink, you should change the query in the first place to
SELECT items, itemLink FROM menus

Answer 2

You can use simple array_combine() function to do what you are trying to do now.
$merged = array_combine($fetchItem, $fetchLink);
This will make all the item from $fetchItem as keys to the item from $fetchLink.