Find object key in array using value inside an array inside the object PHP

Question

I have an object array built like this (output of a "var_dump()" call i sanitized for the question a bit):

sObjects:array(3) {
  [0]=>
  object(SObject)#1 (2) {
    ["type"]=>
    string(9) "Course__c"
    ["fields"]=>
    array(1) {
      ["Id__c"]=>
      string(3) "111"
    }
  }  
  [1]=>
  object(SObject)#2 (2) {
    ["type"]=>
    string(9) "Course__c"
    ["fields"]=>
    array(1) {
      ["Id__c"]=>
      string(3) "222"
    }
  }
  [2]=>
  object(SObject)#3 (2) {
    ["type"]=>
    string(9) "Course__c"
    ["fields"]=>
    array(1) {
      ["Id__c"]=>
      string(3) "333"
    }
  }
}

Now, lets say i have $id = "111" How would i go about iterating over my object array and retrieve the array key where [id__c] has a value equal to $id? for example in this case i would expect to get back 0.

What do you mean by "best way"? Is this the fastest way? In this case it's better to tell about how this data is generated (e.g. it is read from database, calculated somehow, etc.) — am.rez
– am.rez, Commented Mar 5, 2017 at 14:04
Tried accessing it in a while loop with the fetch_object() function, accessing $object->fields->id__c and $object->id__c. Tried using a foreach($array as $object) and again access it the same way and it didn't work (not to mention i have no idea how to get the array key in that method) — RealGigex
– RealGigex, Commented Mar 5, 2017 at 14:05

Dan Ionescu · Accepted Answer · 2017-03-05 16:01:57Z

2

Use array_filter like this:

$array = [
    [
    "type" => "Course__c",
    "fields" => ["Id_c" => "111"]
    ],
    [
    "type" => "Course__c",
    "fields" => ["Id_c" => "222"]
    ]
];

$result = array_filter($array,
    function($element) {
        return $element['fields']['Id_c'] == "111" ? true :false;
    });

print_r($result);

Will output:

Array
(
    [1] => Array
    (
        [type] => Course__c
        [fields] => Array
            (
                [Id_c] => 111
            )

    )

    )

For the Sobject version, replace $element['fields']['Id_c'] with $element->fields['Id_c']

Also if you would like to pass a variable inside the callback function use:

$result = array_filter($array,
    function($element) use($externalVariable){
        return $element['fields']['Id_c'] == $externalVariable ? true :false;
});

edited Mar 5, 2017 at 16:01

answered Mar 5, 2017 at 14:04

Dan Ionescu

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6 Comments

Dan Ionescu Over a year ago

Now i see that you have an array with objects, can you post the "SObject" code, you need to access the objects methods to get to it's fields, it could be something like $element->getFields()[0] instead f $element['fields']['Id_c']

RealGigex Over a year ago

What do you mean by "sObject code"? Do you mean how my sObject is declared?

Dan Ionescu Over a year ago

The array you have posted it's made of "object(SObject)#" objects, objects have setters getters, public properties and other methods. It would help if you could post the object code, it would start with class SObject{ /// some code}. Give it a try with $element->fields['Id_c'] instead of $element['fields']['Id_c']

RealGigex Over a year ago

Yes! using $element->fields[Id__c] worked! And since i use your filter suggestion i don't even need the keys of the array since filtering it was my goal anyway. Thank you very much!

RealGigex Over a year ago

I encountered another issue now.. as i said before i am using a string array of ids to filter my object array by. But how would i pass the string into the filter method?

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