- var_dump: documentation ( source)
<?php
$a = array('a' => 'a', 'b' => 'b', 'z' => array('c' => 'c', 'd' => 'd'));
$b = array('a' => 'c', 'z' => array('c' => 'e'));
$merge = function(&$a, &$b) use (&$merge){
if (is_array($a) && is_array($b)){
foreach ($b as $key => &$value){
if (is_array($value) && isset($a[$key]) && is_array($a[$key])){
$a[$key] = $merge($a[$key], $value);
} else {
if (is_int($key)){
$a[] = $value;
} else {
$a[$key] = $value;
}
}
}
return $a;
} else {
return $b;
}
};
var_dump($merge($a, $b));