Convert stdClass object to array in PHP [duplicate]

Question

I fetch post_id from postmeta as:

$post_id = $wpdb->get_results("SELECT post_id FROM $wpdb->postmeta WHERE (meta_key = 'mfn-post-link1' AND meta_value = '". $from ."')");

when i try print_r($post_id); I have array like this:

Array
(
    [0] => stdClass Object
        (
            [post_id] => 140
        )

    [1] => stdClass Object
        (
            [post_id] => 141
        )

    [2] => stdClass Object
        (
            [post_id] => 142
        )

)

and i dont know how to traverse it, and how could I get array like this

Array
(
    [0]  => 140


    [1] => 141


    [2] => 142

)

Any idea how can I do this?

Cesar Bielich · Accepted Answer · 2020-02-24 04:42:25Z

351

The easiest way is to JSON-encode your object and then decode it back to an array:

$array = json_decode(json_encode($object), true);

Or if you prefer, you can traverse the object manually, too:

foreach ($object as $value) 
    $array[] = $value->post_id;

edited Feb 24, 2020 at 4:42

Cesar Bielich

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answered Oct 21, 2013 at 12:55

Amal

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10 Comments

akshaynagpal Over a year ago

Why can't we just do $array = json_decode($object,true) ?

Amal Over a year ago

@akshaynagpal: It'd result in an error because you'll be giving an object to a function that expects a JSON string as its input. In the answer, I am converting the object to a JSON string, and then feeding it as an input to json_decode() so it would return an array (the second parameter being as True indicates an array should be returned).

chhameed Over a year ago

i know its too late , but why you not use type casting ... (array) $obj

Amal Over a year ago

@NgSekLong: Not really, no.

Amal Over a year ago

@chhameed: Typecasting won't work if your object has other objects nested inside it. See example - eval.in/1124950

|

Félix Adriyel Gagnon-Grenier · Accepted Answer · 2014-06-19 18:36:05Z

68

Very simple, first turn your object into a json object, this will return a string of your object into a JSON representative.

Take that result and decode with an extra parameter of true, where it will convert to associative array

$array = json_decode(json_encode($oObject),true);

edited Jun 19, 2014 at 18:36

Félix Adriyel Gagnon-Grenier

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answered Jun 19, 2014 at 18:13

Rey Ramos

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1 Comment

Krzysztof Madejski Over a year ago

The problem is with values that are not json-encodable or not standardized, ie. dates.

Amal · Accepted Answer · 2013-11-02 12:55:58Z

29

Try this:

$new_array = objectToArray($yourObject);

function objectToArray($d) 
{
    if (is_object($d)) {
        // Gets the properties of the given object
        // with get_object_vars function
        $d = get_object_vars($d);
    }

    if (is_array($d)) {
        /*
        * Return array converted to object
        * Using __FUNCTION__ (Magic constant)
        * for recursive call
        */
        return array_map(__FUNCTION__, $d);
    } else {
        // Return array
        return $d;
    }
}

edited Nov 2, 2013 at 12:55

Amal

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answered Oct 21, 2013 at 12:54

Alessandro Minoccheri

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1 Comment

Vivek Over a year ago

Perfect function to change the stdobject to array

JustBaron · Accepted Answer · 2017-09-08 13:11:16Z

26

You can convert an std object to array like this:

$objectToArray = (array)$object;

edited Sep 8, 2017 at 13:11

JustBaron

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answered Sep 8, 2017 at 12:11

Dinesh Kaswan

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2 Comments

Ivan Carosati Over a year ago

This is great, but it converts only the first level. If you have nesting you have to do it for all nodes.

Saravana Over a year ago

Easy fix it worked

Tayyab Hayat · Accepted Answer · 2020-07-08 13:37:35Z

22

There are two simple ways to convert stdClass Object to an Array

$array = get_object_vars($obj);

and other is

$array = json_decode(json_encode($obj), true);

or you can simply create array using foreach loop

$array = array();
foreach($obj as $key){
    $array[] = $key;
}
print_r($array);

answered Jul 8, 2020 at 13:37

Tayyab Hayat

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Comments

Nagama Inamdar · Accepted Answer · 2019-08-09 05:37:51Z

7

For one-dimensional arrays:

$array = (array)$class;

For multi-dimensional array:

function stdToArray($obj){
  $reaged = (array)$obj;
  foreach($reaged as $key => &$field){
    if(is_object($field))$field = stdToArray($field);
  }
  return $reaged;
}

edited Aug 9, 2019 at 5:37

Nagama Inamdar

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answered Jul 6, 2014 at 14:03

Stack Overflow

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2 Comments

gung - Reinstate Monica Over a year ago

Welcome to SO. Would you mind expanding your answer a little to explain how it solves the problem?

Stack Overflow Over a year ago

For one-dimensional arrays: $array = (array)$class; For multi-dimensional array: code from above

Nagama Inamdar · Accepted Answer · 2015-02-16 10:29:01Z

6

While converting a STD class object to array.Cast the object to array by using array function of php.

Try out with following code snippet.

/*** cast the object ***/    
foreach($stdArray as $key => $value)
{
    $stdArray[$key] = (array) $value;
}   
/*** show the results ***/  
print_r( $stdArray );

edited Feb 16, 2015 at 10:29

answered Feb 16, 2015 at 10:03

Nagama Inamdar

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2 Comments

Coleman Over a year ago

This will convert the outer object to an array, but if any of the properties are also objects they won't be converted.

Nagama Inamdar Over a year ago

As per the OP's question he has one level of object structure. For next levels you have to add another foreach loop.

Vlad · Accepted Answer · 2013-10-21 13:09:30Z

5

$wpdb->get_results("SELECT ...", ARRAY_A);

ARRAY_A is a "output_type" argument. It can be one of four pre-defined constants (defaults to OBJECT):

OBJECT - result will be output as a numerically indexed array of row objects.
OBJECT_K - result will be output as an associative array of row objects, using first columns values as keys (duplicates will be discarded).
ARRAY_A - result will be output as an numerically indexed array of associative arrays, using column names as keys.
ARRAY_N - result will be output as a numerically indexed array of numerically indexed arrays.

See: http://codex.wordpress.org/Class_Reference/wpdb

edited Oct 21, 2013 at 13:09

answered Oct 21, 2013 at 13:03

Vlad

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1 Comment

Raptor Over a year ago

this is the only suggested way in WordPress world.

Sajuna Fernando · Accepted Answer · 2013-10-21 13:02:31Z

3

You can try this:

$aInitialArray = array_map(function($oObject){
    $aConverted = get_object_vars($oObject);
    return $aConverted['post_id'];
}, $aInitialArray);

answered Oct 21, 2013 at 13:02

Sajuna Fernando

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Comments

Raptor · Accepted Answer · 2019-10-08 07:07:06Z

2

if you have an array and array element is stdClass item then this is the solution:

foreach($post_id as $key=>$item){
    $post_id[$key] = (array)$item;
}

now the stdClass has been replaced with an array inside the array as new array element

edited Oct 8, 2019 at 7:07

Raptor

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answered Sep 1, 2015 at 14:53

softnwords

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Comments

Decebal · Accepted Answer · 2016-02-09 14:41:08Z

1

Using the ArrayObject from Std or building your own

(new \ArrayObject($existingStdClass))

you can use the build in method on the new class:

getArrayCopy()

or pass the new object to

iterator_to_array

answered Feb 9, 2016 at 14:41

Decebal

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1 Comment

Patrick Over a year ago

If $existingStdClass has a property that is another stdClass then that property remains a stdClass in resulting array. If you need something that works recursively then it seems you need to use the json techniques

varun sharma · Accepted Answer · 2017-03-30 13:52:08Z

1

Lets assume $post_id is array of $item

$post_id = array_map(function($item){

       return $item->{'post_id'};

       },$post_id);

strong text

answered Mar 30, 2017 at 13:52

varun sharma

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1 Comment

mickmackusa Over a year ago

This is more simply accomplished with array_column().

Cyborg · Accepted Answer · 2019-12-10 04:40:19Z

0

I have a function myOrderId($_GET['ID']); which returns multidimensional OBJ. as a String.

None of other 1 liner wokred for me.

This both worked:

$array = (array)json_decode(myOrderId($_GET['ID']), True);

$array = json_decode(json_decode(json_encode(myOrderId($_GET['ID']))), True);

answered Dec 10, 2019 at 4:40

Cyborg

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Comments

RGriffiths · Accepted Answer · 2022-11-11 09:41:33Z

0

I had a problem with this as my stdClass had stdClasses within them repeatedly. This function recursively converts all elements to an array:

$newArray = objectToArray($oldArray)

function objectToArray($data) {
    // If the element being looked is an object convert to an array
    if(is_object($data)) {
      $data = get_object_vars($data);
    }
    // If the element is an array, iterate though it and call the function again on each item
    if(is_array($data)) {
        foreach($data as $key=>$value){
            $data[$key] = objectToArray($value);
        }
    }
    return $data;
}

edited Nov 11, 2022 at 9:41

answered Nov 10, 2022 at 19:23

RGriffiths

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3 Comments

mickmackusa Over a year ago

This is certainly the long way of doing what the accepted answer achieves in a single line of code.

RGriffiths Over a year ago

@mickmackusa Maybe but the accepted answer didn't work for me.

mickmackusa Over a year ago

I don't understand how this could be. Perhaps prove that claim with a 3v4l.org demo so that we can see the troublesome data.

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