<?php

$array = [

    'ZAS' => [
        '[p1]' => 'zoo',
        '[P1]' => 'zav',
        '[P2]' => 'zwt',
        '[XL]' => 'zpl',
        '[XR]' => 'rer',
        '[XI]' => 'zpd',
        '[Z4]' => 'zzu',
        '[X1]' => 'za2',
        '[X2]' => 'zzo',
        '[X3]' => 'zau',
        '[X4]' => 'zai',
        '[X5]' => 'zap',
        '[X6]' => 'zaq',
    ],

    'POL' => [
        '[P1]' => [
            '_QWERTY_' => 'op_qwerty',
            '_BETA_' => 'op_beta',
        ],
        '[A1]' => [
            '_SUROB_' => 'oa_surob',
            '_KINWIR_' => 'op_kinwir',

        ],
        '[A2]' => [
            '_SANEL_' => 'oa2_sanel',
            '_NABOR_' => 'oa2_nabor',
        ],

    ],
    'DOP' => [
        '[P3]' => 'pc',
        '[RG]' => 'gp',
    ]
];


foreach ($array as $x => $val) {
    print_r("$x = $val</br>");
    foreach ($val as $k => $val2) {
        print_r("$k = $val2</br>");
    }
}