PHP. Is it possible to use array_column with an array of objects

Question

Is it possible to pass in array_column an array of objects?
I have implemented ArrayAccess interface, but it has no effect.
Should I implement another one?

class Foo implements ArrayAccess {      public $Id, $Title;      public function offsetExists($offset)     {         return isset($this->{$offset});     }          public function offsetGet($offset)     {         return $this->{$offset};     }      public function offsetSet($offset, $value)     {         $this->{$offset} = $value;     }      public function offsetUnset($offset)     {         unset($this->{$offset});     } }  $object = new \Foo(); $object->Id = 1; $object->Title = 'Test';  $records = array(     $object,      array(         'Id' => 2,         'Title' => 'John'     ) );  var_dump(array_column($records, 'Title')); // array (size=1) 0 => string 'John' (length=4) 

Answer 1

PHP 5

array_column doesn't work with an array of objects. Use array_map instead:

$titles = array_map(function($e) {     return is_object($e) ? $e->Title : $e['Title']; }, $records); 

PHP 7

array_column()

The function now supports an array of objects as well as two-dimensional arrays. Only public properties are considered, and objects that make use of __get() for dynamic properties must also implement __isset().

See https://github.com/php/php-src/blob/PHP-7.0.0/UPGRADING#L629 - Thanks to Bell for the hint!

Answer 2

Is it possible to pass in array_column an array of objects?

PHP 7

Yes, see http://php.net/manual/en/function.array-column.php

PHP 5 >= 5.5.0

In PHP 5 array_column does not work with an array of objects. You can try with:

// object 1 $a = new stdClass(); $a->my_string = 'ciao'; $a->my_number = 10;  // object 2 $b = new stdClass(); $b->my_string = 'ciao b'; $b->my_number = 100;  // array of objects $arr_o = array($a,$b);  // using array_column with an array of objects $result = array_column(array_map(function($o){return (array)$o;},$arr_o),'my_string'); 

PS: for clarity I prefer to not use array_column and use array_map with an anonymous function

$result = array_map(function($o){ return $o->my_string; }, $arr_o); 

or a simple foreach

$result = array(); foreach($arr_o as $o) {     $result[] = $o->my_string; }