- print_r: documentation ( source)
<?php
$a = [
"q" => 10,
"w" => 20,
"e" => 30,
"r" => 40,
"t" => 50,
"y" => "asdf",
"u" => "zxcv",
"i" => "lkjh"
];
$b = [
"e" => 77,
"r" => 11,
"t" => 55,
"u" => "www"
];
$c = arra_merge($a, $b);
print_r($c);