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@ 2019-07-24T12:40:16Z

<?php

$structure = [
    "a",
    "b" => [
        "b1",
        "b2" => [
            "b21",
            "b22"
        ]
    ]
];

$data = ['A', 'B1', 'B21', 'B22'];

$filled = 0;
array_walk_recursive ($structure, function (&$val) { 
	global $filled; 
	global $data;
	$val = array( $val => $data[ $filled ] ); 
	$filled++; 
});

print_r( $structure );

Output
Performance
VLD
References
Branches

print_r: documentation ( source)
array_walk_recursive: documentation ( source)

preferences:dark modelive preview

29.2 ms | 402 KiB | 5 Q