Getting a value from an array in PHP

Question

I'm a bit confused with the array that I have to work with. The following array:

print_r($myArray);

returns the following:

Array (
    [0] => stdClass Object (
        [id] => 88
        [label] => Bus
    )
    [1] => stdClass Object (
        [id] => 89
        [label] => Bike
    )
    [2] => stdClass Object (
        [id] => 90
        [label] => Plane
    )
    [3] => stdClass Object (
        [id] => 91
        [label] => Submaine
    )
    [4] => stdClass Object (
        [id] => 92
        [label] => Boat
    )
    [5] => stdClass Object (
        [id] => 93
        [label] => Car
    )
    [6] => stdClass Object (
        [id] => 94
        [label] => Truck
    )
)

How do I get the label value, say, "Submaine", if I have the $id = 91?

If you can change the way the array is constructed, you should index the items with the "id", that will be easier. Then you can just do $item = $myArray[$id]; — Matthieu Napoli
– Matthieu Napoli, Commented May 15, 2011 at 20:04
A class is creating this array, so unfortunately I have to work with what I've got. But you're right, I wish I could just call by ID. — santa
– santa, Commented May 15, 2011 at 20:09

AJ. · Accepted Answer · 2011-05-15 20:03:37Z

7

This will get you the object(s) you seek:

$objects = array_filter($myArray, function($item){ return $item->id == 91 })

Then it's just a matter of getting the attribute of the object that you want.

answered May 15, 2011 at 20:03

AJ.

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7 Comments

onteria_ Over a year ago

Those are objects, so it would be return $item->id == 91

anubhava Over a year ago

+1 For suggesting array_filter rather than the obvious array looping.

Tadeck Over a year ago

onteria_ is correct, but AJ's answer is the best from three available now (the part mentioned by onteria_ is the only issue here).

lonesomeday Over a year ago

It's a lovely solution, just far slower.

lonesomeday Over a year ago

@AJ Well, yes, but that isn't exactly unlikely, is it? If we're assuming that the last item is the one we want, the fastest solution is array_pop! (I'm being facetious, but still...)

|

lonesomeday · Accepted Answer · 2011-05-15 20:38:39Z

3

You're going to have to loop through the array, I think.

$value = '';
foreach ($myArray as $el) {
    if ($el->id === 91) { // or other number
        $value = $el->label;
        break;
    }
}

The label is now contained in $value.

Benchmark values vs AJ's version for 1000000 iterations (see source):

lonesomeday: 1.8717081546783s
AJ: 4.0924150943756s
James C: 2.9421799182892s

edited May 15, 2011 at 20:38

answered May 15, 2011 at 20:04

lonesomeday

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2 Comments

Matthieu Napoli Over a year ago

+1 for posting a benchmark, this is very interesting ! What did you use for benchmarking ?

lonesomeday Over a year ago

@Matthieu A quick script I wrote myself -- see the link in the answer.

James C · Accepted Answer · 2011-05-15 20:06:59Z

2

What you have there is an array of objects. I'd suggest re-keying the array by id like this:

$new = array();
foreach($array as $obj) {
    $new[ $obj->id ] = $new[ $obj->label ];
}

Now you've got a nice associative array that you can use normally e.g. echo $new[92] will echo "Boat"

answered May 15, 2011 at 20:06

James C

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