Instantiate all items in an array as objects of a class in PHP

Question

I have an array of variables that are passed to a constructor of a class. I want to convert this into an array of objects of a specific class.

What's the best way to do this?

E.g.

class Foo { public function __construct($a) {$this->a=$a;} }
print_r(mass_instantiate(array(1, 2, 3), 'Foo'));

// gives:

Array
(
    [0] => Foo Object
        (
            [a] => 1
        )

    [1] => Foo Object
        (
            [a] => 2
        )

    [2] => Foo Object
        (
            [a] => 3
        )

)

Vipin Jain · Accepted Answer · 2012-06-07 13:33:30Z

1

Use Array walk:

$arr = array(1,2,3,4,5,6,7,8,9,10);
array_walk($arr, 'init_obj');

function init_obj(&$item1, $key){
    $item1 = new Foo($item1);
}
print_r($arr);

this will give you the required output.

answered Jun 7, 2012 at 13:33

Vipin Jain

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2 Comments

dave1010 Over a year ago

This is essentially using array_walk to change the original array instead of creating a new array with array_map. Are there any advantages of this?

Vipin Jain Over a year ago

@dave1010: no new memory allocated. while what you want is achieved here with better performance.:)

dave1010 · Accepted Answer · 2012-06-07 13:25:25Z

0

This is what I'm currently using. It's limited in that you can only pass 1 argument

/**
 * Instantiate all items in an array
 * @param  array $array of $classname::__construct()'s 1st parameter
 * @param  string $classname to instantiate
 * @return array
 */
function mass_instantiate($array, $classname)
{
    return array_map(function($a) use ($classname) {
        return new $classname($a);
    }, $array);
}

answered Jun 7, 2012 at 13:25

dave1010

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