用于构造数组的PHP等价的JavaScript扩展语法是什么？

Question

Asked already a question about converting functions from Ruby to JS, and now I'm trying to implement with JS to PHP, but something does not work, tell me what I'm missing?

The code on JS:

function transpose(a) {
    return a.length === 0 ? a : a[0].map((col, i) => a.map((row) => row[i]))
}

function f(a) {
    return a.length === 0 ? [] : [...a.shift(), ...f(transpose(a).reverse())];
} 

console.log(f([[1, 2, 3, 4], [12, 13, 14, 5], [11, 16, 15, 6], [10, 9, 8, 7]]))

In PHP do so:

function transpose($array) 
{
    if (count($array) === 0) return $array;

    foreach ($array as  $rowkey => $row)
    {
        foreach($row as $colkey => $col)
        {
            $out[$colkey][$rowkey] = $col;
        }
    }

    return $out;
}

function f($a)
{
    return (count($a) === 0) 
    ? [] 
    : [
        array_shift(...$a), 
        f(array_reverse(transpose(...$a)))
    ];
}

print_r(f([[1,2,3,4],[10,11,12,5],[9,8,7,6]]));

Is there a problem? Errors:

Warning: array_shift() expects exactly 1 parameter, 3 given in [...][...] on line 24

Invalid argument supplied for foreach() in [...][...] on line 10

Warning: Invalid argument supplied for foreach() in [...][...] on line 10

Warning: Invalid argument supplied for foreach() in [...][...] on line 10

Warning: Invalid argument supplied for foreach() in [...][...] on line 10

Notice: Undefined variable: out in [...][...] on line 16

Warning: array_reverse() expects parameter 1 to be array, null given in [...][...] on line 25 Warning: count(): Parameter must be an array or an object that implements Countable in [...][...] on line 21

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Answer 1

You don't need to use the ... operator in the PHP version. You just need to merge the shifted row with the result of the recursive call.

function f($a)
{
    return (count($a) === 0) 
    ? [] 
    : array_merge(
        array_shift($a), 
        f(array_reverse(transpose($a)))
    );
}

---

array_merge(array_shift($a), f(array_reverse(transpose($a))))

is the same thing that's happening here:

[...a.shift(), ...f(transpose(a).reverse())]

... expands the elements of the array in JS. It works similarly in PHP, but here it is only valid in function definitions or calls.