Transpose an Array in PHP

With PHP 5.6, variadic functions using the ... operator made array transposition much cleaner.

Modern approach (PHP 5.6+)

function transpose($array) {
    return array_map(null, ...$array);
}

Simple, elegant, and easy to understand.

Legacy approach

Before PHP 5.6, the solution was more of a hack than an implementation:

function transpose($array) {
    array_unshift($array, null);
    return call_user_func_array('array_map', $array);
}

It works, but it’s not intuitive. The version with the spread operator is far superior.

Hope it helps!