array of arrays to array of objects php

Question

I am trying to convert the associative array to an array of objects.

$assoc = array (
array(
    'prop1'=>'val1',
    'prop2'=>'val2',
),

array(
    'prop1'=>'val1',
    'prop2'=>'val2',
),
)

Here Is the code I have so far:

class Assoc {
public function setObject($assoc) {
    $this->assoc[] = new Obj($assoc);
}
}
class Obj {
public function __construct($item) {
    foreach ( $item as $property=>$value ) {
        $this->{$property} = $value;
    }
}
}

$test = New Assoc();
$test->setObject($assoc);

This code will work for a single array but not an array of arrays. If you could help with what I believe to be the loop in the setObject function.

Sorry, in trying to generalize the code I missed changing a few vars. They are both $assoc and updated in the post. — Matthew Sprankle
– Matthew Sprankle, Commented Jan 14, 2012 at 6:41

jmkeyes · Accepted Answer · 2012-01-14 06:51:06Z

9

Convert the associative array to an array of objects:

$output = array_map(function($element) {
    return (object) $element;
}, $assoc);

Simple enough.

EDIT: If you need to make objects of a specific class:

$output = array_map(function($element) use ($classType) {
    return new $classType($element);
}, $assoc);

You can generalize it into just about anything, really.

edited Jan 14, 2012 at 6:51

answered Jan 14, 2012 at 6:45

jmkeyes

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2 Comments

Matthew Sprankle Over a year ago

Note Ending code is

public function setInput($assoc) {         $this->assoc= array_map(function($item){return new Input($item);}, $assoc);     }

jmkeyes Over a year ago

You really, really, don't need classes for this. PHP already has two types of arrays: a built-in one and SPL "fixed" arrays. Use the first if you need hash-table semantics, and the second if you need fixed-size arrays. Don't create your own wrapper.

codercake · Accepted Answer · 2012-01-14 07:38:56Z

6

EDIT for specific object:

To adhere to your existing style as close as possible without messing with array_map voodoo:

class Assoc {
  public function setObject($assoc) {
    foreach ($assoc as $arr) {
      $this->assoc[] = new Obj($arr);
    }   
  }
}
class Obj {
   public function __construct($item) {
     foreach ( $item as $property=>$value ) { 
       $this->{$property} = $value;
     }  
   }   
}

$test = New Assoc();
$test->setObject($assoc);

Original:

If you just need generic conversion, and not into specific custom objects (not exactly clear in your post?) you can try this:

$new_array = array();
foreach ($assoc as $to_obj)
{
  $new_array[] = (object)$to_obj;
}

// Print results
var_dump($new_array);

outputs:

array(2) {
  [0]=>
  object(stdClass)#1 (2) {
    ["prop1"]=>
    string(4) "val1"
    ["prop2"]=>
    string(4) "val2"
  }
  [1]=>
  object(stdClass)#2 (2) {
    ["prop1"]=>
    string(4) "val1"
    ["prop2"]=>
    string(4) "val2"
  }
}

edited Jan 14, 2012 at 7:38

answered Jan 14, 2012 at 6:42

codercake

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3 Comments

Matthew Sprankle Over a year ago

I am looking for similar output into a Specific object.

Matthew Sprankle Over a year ago

I am trying: foreach ($assoc as $to_obj) { $this->assoc[] = new Obj($to_obj); } But am getting invalid argument supplied for foreach

jmkeyes Over a year ago

array_map is considered "voodoo"?

Shiplu Mokaddim · Accepted Answer · 2012-01-14 06:44:36Z

1

$len = count($assoc);
for($i=0;$i<$len; $i++){
    $assoc[$i] = (Object)$assoc[$i];
}

answered Jan 14, 2012 at 6:44

Shiplu Mokaddim

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Comments

mickmackusa · Accepted Answer · 2021-04-27 03:19:14Z

You have an indexed array of associative arrays. If you convert it to json then back to an iterable state with the default behavior of json_decode(), the top level (indexed array) will be cast as array-type while the subarrays will become object-type.

Note that this will conversion will permeate all the way through subsequent levels of data (in case researchers might have deeper data structures). Effectively, indexed arrays remain indexed arrays and associative arrays become objects.

This is such a basic call that I am not sure that creating a wrapper for it is necessary.

Code: (Demo)

$assoc = array (
    array(
        'prop1'=>'val1',
        'prop2'=>'val2',
    ),
    array(
        'prop1'=>'val1',
        'prop2'=>'val2',
    ),
);

var_export(
    json_decode(json_encode($assoc))
);

Output:

array (
  0 => 
  (object) array(
     'prop1' => 'val1',
     'prop2' => 'val2',
  ),
  1 => 
  (object) array(
     'prop1' => 'val1',
     'prop2' => 'val2',
  ),
)

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