PHP way to filter a big array by key?

Question

I get a big data collection from a API, the array what I get has more objects who contains: id, name, place, zip.

Now I need to create filter this array, the code is:

$all_objects = $api_result->body->objects;

Of course I can do it with a foreach(), but what is the best way also for performances to filter it like get object by id 973?

edit your question with $all_objects's sample data or link of that api which you are calling. Use array_filter or you can check using array_key_exists functions for faster result. — Bhavin
– Bhavin, Commented Dec 23, 2016 at 10:07
If you need to do a lot of lookups, you might want to re-index your array using the id as the key. — jeroen
– jeroen, Commented Dec 23, 2016 at 10:09
@Federkun this are real estate items, that's reason why it is objects :) — Michelle
– Michelle, Commented Dec 23, 2016 at 10:10

yivi · Accepted Answer · 2016-12-23 10:20:52Z

2

You can use array_filter.

Assuming $all_objects is an array of objects with public properties as id, name, etc...

Example code:

$lookup = 973
$filtered = array_filter($all_objects, function($object) use($lookup) {
  return ($object->id === $lookup);
});

And now $filtered only have one (presumably) object with a public property "id" having 973

Note: As both @timurib and @federkun indicate, this is not the FASTEST way to filter an array. Doing a plain foreach would be, all other things being equal, faster. But you'd be shaving milliseconds and it could be argued that use of array_* functions make the code clearer.

edited Dec 23, 2016 at 10:20

answered Dec 23, 2016 at 10:08

yivi

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6 Comments

Timurib Over a year ago

array_filter definetly is not more effective then foreach. Function call in the PHP requires some overhead and always slower then inline code execution. If the question about perfomance then array_filter is wrong solution.

Federkun Over a year ago

This isn't wrong, but the OP asked for the the best way, O(1), while array_filter has a time complexity of O(N)

yivi Over a year ago

You are both right. Didn't pick up on the performance part. Considering the code I assumed a more basic level of competence, which might have been wrong. My bad. I'll update the answer.

ovicko Over a year ago

Can the use keyword accept an array? Example use($my_array).I have searched for its doc ,so far none

yivi Over a year ago

@ovicko, yes, it can accept any variable. the array wont be expanded, but inherited by the closure as is. you can pass several variables as well.

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