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@ 2018-02-02T10:51:28Z

<?php

$input = ['dir2', 'dir2_1', 'dir2_1_1'];

function convert_array(array $input, array $output = []) {
    if (empty($input)) {
        return $output;
    }
    
    $value = array_pop($input);
    
    return convert_array($input, [$value => $output]);
}

var_dump(convert_array($input));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
array_pop: documentation ( source)

preferences:dark modelive preview

55.47 ms | 402 KiB | 5 Q