Array of mixed (usualy objects) to indexed array via array_reduce

indexed_array_reduce.php

<?php

array_reduce(
	$objects, // array of objects, arrays...
	function ($array, $item) {
		$array[$item->getId()] = $item; // $item is current element
		return $array; // $array is whole array that will be returned
	},
	array() // begin with empty array - strict standards
);

// Copy & paste friendly version

array_reduce($objects, function ($array, $item) {
		$array[$item->getId()] = $item;
		return $array;
}, array());