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up vote 0 down vote favorite

I have the following array:

array(15) { 
    [0]=> object(stdClass)#317 (2) { ["id"]=> string(1) "2" ["value"]=> string(1) "1" } 
    [1]=> object(stdClass)#316 (2) { ["id"]=> string(1) "3" ["value"]=> string(531) "awfaww" }   
    [2]=> object(stdClass)#315 (2) { ["id"]=> string(1) "4" ["value"]=> string(1) "1" } 
    [3]=> object(stdClass)#318 (2) { ["id"]=> string(1) "5" ["value"]=> string(1) "1" } 
    [4]=> object(stdClass)#319 (2) { ["id"]=> string(1) "6" ["value"]=> string(1) "1" } 
    [5]=> object(stdClass)#320 (2) { ["id"]=> string(1) "7" ["value"]=> string(1) "1" } 
    [6]=> object(stdClass)#321 (2) { ["id"]=> string(1) "8" ["value"]=> string(1) "1" } 
    [7]=> object(stdClass)#322 (2) { ["id"]=> string(2) "30" ["value"]=> string(8) "12:30:02" }
    [8]=> object(stdClass)#323 (2) { ["id"]=> string(2) "31" ["value"]=> string(8) "18:12:00" }
    [9]=> object(stdClass)#324 (2) { ["id"]=> string(2) "11" ["value"]=> string(10) "2014-06-17" } 
    [10]=> object(stdClass)#325 (2) { ["id"]=> string(2) "12" ["value"]=> string(10) "2014-06-26" } 
    [11]=> object(stdClass)#326 (2) { ["id"]=> string(2) "14" ["value"]=> string(1) "2" }       
    [12]=> object(stdClass)#327 (2) { ["id"]=> string(2) "15" ["value"]=> string(1) "2" } 
    [13]=> object(stdClass)#328 (2) { ["id"]=> string(2) "16" ["value"]=> string(1) "4" } 
    [14]=> object(stdClass)#329 (2) { ["id"]=> string(2) "17" ["value"]=> string(1) "5" } 
}

I would like to get a specific value from this array using the ID. For example, if the ID: 11 is found in the array I want to retrieve its value. How can I do this?

share|improve this question
1  
@Leri First of all it's "Stare" and second, take your non-constructive comments elsewhere, thanks. –  johnnyTrak Jun 2 at 11:44
    
@johnnyTrak It's perfectly constructive and really provides a hint, how to solve the problem. :) And thanks for noticing typo. –  Leri Jun 2 at 11:45
    
@Leri from what I know about this page its not about providing hints, but useful answers and I dont really find yours very useful. –  MONZTAAA Jun 2 at 11:46
    
@MONZTAAA Solutions go as answers. Asking for additional information, giving hints and linking to resources goes in comments. ;) –  Leri Jun 2 at 11:48
    
@Leri as I said, check the first comment, thats a hint/information, not yours. –  MONZTAAA Jun 2 at 11:49

3 Answers 3

up vote 0 down vote

Try something like this:

<?php
function findById($array, $id) {
    foreach ($array as $value) {
        if ($value->id == $id) {
            return $value->value;
        }
    }
    return null;
}
$result = findById($yourArray, 11);
?>
share|improve this answer
up vote 0 down vote

if the array is static for each run - i'd suggest changing the array into "key"=>"value" array, using this:

$new_arr = array();
foreach($original_array as $object) {
    $new_arr[$object->id] = $object->value;
}

and then you can just use $new_arr[id], instead of searching the whole original array each time.

share|improve this answer
up vote 0 down vote

You can use array_filter:

array_filter($arr, function($i) { return $i->id == '11'; });

See Documentation

share|improve this answer
    
The good thing about php arrays is that they are implemented as hashtables and since id is assumed to be unique, id in object can/should become a key in array so access to it can be O(1) instead of O(n). The latter is the case for array_filter –  Leri Jun 2 at 12:00
    
Well, apparently that's not the case here since the id doesn't match the key. –  haim770 Jun 2 at 12:03
    
Yes, however, I think that should have been noted for future readers who potentially have ability to change data-structure. –  Leri Jun 2 at 12:04

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