generate random json data structure using a cryptographically secure prng

aej.php

<?php
declare(strict_types=1);

// final associative array to json_encode
$output = [];

// root level array keys
$keys_0_min = 1;
$keys_0_max = 10;
$keys_0     = [];
for($i = 0, $i_max = random_int($keys_0_min, $keys_0_max); $i < $i_max; $i++) {
	$keys_0[] = bin2hex(random_bytes(random_int(2,8)));
}

foreach ($keys_0 as $key_0)
{
	if (!array_key_exists($key_0, $output))
	{
		$output[$key_0] = [];
		
		// nested data
		$deeper_key_min = 1;
		$deeper_key_max = 10;
		
		$deeper_value_min = 1;
		$deeper_value_max = 10;
		
		for ($n = 0, $n_max = random_int($deeper_key_min, $deeper_key_max); $n < $n_max; $n++) {
			
			if (random_int(0, 80) > random_int(10, 40)) {
				$deep_filler = [];
				for($j = 0, $j_max = random_int($deeper_value_min, $deeper_value_max); $j < $j_max; $j++) {
					$deep_filler[] = bin2hex(random_bytes(random_int(2,16)));
				}
			} else {
				$deep_filler = bin2hex(random_bytes(random_int(2,16)));
			}
			
			$output[$key_0][bin2hex(random_bytes(random_int(2,4)))] = $deep_filler;
		}
	}
}

echo var_export($output);

Changed licence of this gist and my latest domain.