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The NDArray Object

Our library implements the NDArray object, this object works like an Array and is the object used by default in the arguments of NumPower operations.

<?php
use \NDArray as nd;

$a = nd::array([[1, 2], [3, 4]]);
print_r($a); // or echo $a;
Output
[[1, 2],
 [3, 4]]

Converting back to a PHP array​

To use your NDArray in other PHP libraries, you can convert your NDArrays to PHP arrays by calling the toArray method:

<?php

$a = new NDArray([[1, 2], [3, 4]]);
print_r($a->toArray());
Output
Array
(
    [0] => Array
        (
            [0] => 1
            [1] => 2
        )

    [1] => Array
        (
            [0] => 3
            [1] => 4
        )

)

Single Precision Float​

Unlike the PHP runtime, which uses double precision, NDArrays use single precision floats by default. This significantly increases the speed of some operations and reduces RAM consumption by up to 2 times compared to an array using PHP arrays.

On the other hand, remember that you will lose precision when converting a PHP array to an NDArray. This is generally not an issue for most use cases.

Multi-Type Support​

Currently the only supported type is the float32 type, however, NDArray has been developed internally to support multi-types in the future. We will work to implement support for other types.

note

We'll work on implementing smaller types like half precision floats first.