<?php
 
$arr = [
    [
        'year' => 20,
        'np_kama' => [
            'ch' => [
                'ch_all' => 10,
                'ch_result_smena' => 33,
                'ch_2_sutok' => 18,
                'ch_3_5_sutok' => 15
            ],
 
            'chd' => [
                'chd_all' => 0,
                'chd_result_smena' => 0,
                'chd_2_sutok' => 0,
                'chd_3_5_sutok' => 0
            ],
 
            'fakt' => [
                'fakt_all' => 0,
                'fakt_result_smena' => 0,
                'fakt_2_sutok' => 0,
                'fakt_3_5_sutok' => 0
            ]
        ]
    ],
 
    [
        'year' => 20,
        'np_borok' => [
            'ch' => [
                'ch_all' => 20,
                'ch_result_smena' => 9,
                'ch_2_sutok' => 9,
                'ch_3_5_sutok' => 0
            ],
 
            'chd' => [
                'chd_all' => 33,
                'chd_result_smena' => 9,
                'chd_2_sutok' => 9,
                'chd_3_5_sutok' => 0
            ],
 
            'fakt' => [
                'fakt_all' => 17,
                'fakt_result_smena' => 0,
                'fakt_2_sutok' => 0,
                'fakt_3_5_sutok' => 0
            ]
        ]
    ],
 
    [
        'year' => 20,
        'np_sholiya' => [
            'ch' => [
                'ch_all' => 10,
                'ch_result_smena' => 3,
                'ch_2_sutok' => 2,
                'ch_3_5_sutok' => 3
            ],
 
            'chd' => [
                'chd_all' => 0,
                'chd_result_smena' => 0,
                'chd_2_sutok' => 0,
                'chd_3_5_sutok' => 0
            ],
 
            'fakt' => [
                'fakt_all' => 0,
                'fakt_result_smena' => 0,
                'fakt_2_sutok' => 0,
                'fakt_3_5_sutok' => 0
            ]
        ]
    ]
];
 
$ch_all = 0;
 
foreach ($arr as $array) {
    foreach ($array as $item) {
        $ch_all += $item['ch']['ch_all'];
    }
}
 
echo $ch_all;

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