<?php
$payload = [
    "int" => 123,
    "zero" => 0,
    "positive" => 5,
    "bool_true" => true,
    "bool_false" => false,
    "float" => 12.75,
    "small_float" => 0.125,
    "subarray" => [
        "inner_int" => 7,
        "inner_false" => false,
        "inner_float" => 2.25,
        "deeper" => [
            "deep_zero" => 0,
            "deep_true" => true,
            "deep_float" => 3.5,
        ],
    ],
];

var_dump($payload);
