Eldar Rakhimberdin Eldar Rakhimberdin - 23 days ago 13
PHP Question

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

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

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!

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