Php Array sorting assoc key after intersect key - php

Question

Currently I have this:
$pattern = array('industry_id','category_id','subcategory_id');
$data = array('advert_id' => string '261501' (length=6)
'advert_type_id' => string '7' (length=1)
'user_id' => string '6221' (length=4)
'industry_id' => string '17' (length=2)
'category_id' => string '769' (length=3)
'subcategory_id' => string '868' (length=3)
'model' => string 'Custom Semi Drop Deck Trailer' (length=29)
'description' => string 'Industry: Trailer );
Then:
array_intersect_key( $data , array_flip($pattern) );
Using array_interect_key & array_flip to get the values from $data based on $pattern, I will get a result like this:
array (size=3)
'category_id' => string '769' (length=3)
'subcategory_id' => string '930' (length=3)
'industry_id' => string '17' (length=2)
Unfortunately as you can see the result key sorting is not the same that I declared in $pattern. Is there a shorthand way to sort it like I declared in $pattern because after this I want to implode the array and do something like this industry_id.category_id.subcategory_id without hard coding the keys.

Answer 1

Since you already figured out array_intersect_key method which will not get you the desired key ordering of $pattern, try this instead:
// since original $pattern is not ASSOC (only vals)
// flip it so defined vals become keys
$pattern_flipped = array_flip($pattern);
$result = array();
foreach ($pattern_flipped as $k => $v) {
if (isset($data[$k])) {
$result[$k] = $data[$k];
}
}
var_dump($result); // test
// can use original 0 1 2 dynamic keys for concatenation
echo $result[$pattern[0]], $result[$pattern[1]], $result[$pattern[2]], '<br>';
// or use hardcoded keys
echo $result['industry_id'], $result['category_id'], $result['subcategory_id'], '<br>';

Answer 2

You know I'm not sure how you're getting the result you describe. I've tried your code and I get
array (size=3)
'industry_id' => string '17' (length=2)
'category_id' => string '769' (length=3)
'subcategory_id' => string '868' (length=3)
You could do this another way though using array_filter
$newData = array_filter($data, function($key) use ($pattern) {
if (in_array($key, $pattern))
return true;
}, ARRAY_FILTER_USE_KEY)