Today I released an ExtendedArray for PHP, you can check It out in Github. An example: use TA\ExtendedArray\Type\ExtendedArray; $fruits = new ExtendedArray( array( 'tropical' => 'pineapple', 'farm' => 'strawberry' ) ); $fruits->has('tropical'); // true $fruits->hasOne(array('tropical', 'asian')); // …