How can I get a key value from two arrays on match? - php

Question

I have 2 arrays, I'm trying to find any matches and return 'url from $array_full.
I tried array_intersect($array_full, $array_ids), but it doesn't work.
$array_full = array
(
Array
(
'#attributes' => Array
(
'topicid' => 102000,
'url' => 'Velkommen.htm',
'alias' => 'Velkommen'
)
),
Array
(
'#attributes' => Array
(
'topicid' => 130313,
'url' => 'WStation/WAS_Indstillinger.htm',
'alias' => 'WAS_Indstillinger'
)
),
Array
(
'#attributes' => Array
(
'topicid' => 130315,
'url' => 'SPedestal/Applikationer/LoadSharing/Indstillinger.htm',
'alias' => 'LOS_Indstillinger'
)
),
Array
(
'#attributes' => Array
(
'topicid' => 130312,
'url' => 'WStation/WAS_Indstillinger.htm',
'alias' => 'WAS_Indstillinger'
)
)
);
$array_ids = array('130312', '130315');
I expect to get an array of matched url's, like:
array('WStation/WAS_Indstillinger.htm','SPedestal/Applikationer/LoadSharing/Indstillinger.htm')

Answer 1

A simple couple of foreach loops seems the easiest approach
$results = [];
foreach ( $array_full as $a ) {
foreach ( $a as $item ) {
if ( in_array($item['topicid'], $array_ids) ) {
$results[] = $item['url'];
}
}
}
print_r($results);
RESULT
Array
(
[0] => SPedestal/Applikationer/LoadSharing/Indstillinger.htm
[1] => WStation/WAS_Indstillinger.htm
)

Answer 2

You will have to make foreach inside foreach to find item that is matching to ID.
Something like this (not tested, may contain some typos).
foreach($array_ids as $id) {
foreach($array_full as $key => $fullItem) {
if($fillItem['#attributes']['topicid'] != $id) {
continue;
}
//do what you need with $fullItem array
$key; // this is the key you want
}
}

Answer 3

you can use array_map, in_array to get the URL's
$result = [];
array_map(function($v) use ($array_ids,&$result){
$result[] = in_array($v['#attributes']['topicid'], $array_ids) ? $v['#attributes']['url'] : '';
}, $array_full);
Result:-
echo '<pre>';
print_r(array_filter($result));
Array
(
[2] => SPedestal/Applikationer/LoadSharing/Indstillinger.htm
[3] => WStation/WAS_Indstillinger.htm
)