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@ 2019-03-23T06:49:42Z

<?php

$method_filters = [
    'exists' => [
        'full pallet' => [
            171 => [
                    'pakkelabels_shipping_gls_private',
                    'pakkelabels_shipping_postnord_private',
                    'pakkelabels_shipping_gls',
                    'pakkelabels_shipping_pdk',
                    'flat_rate:15',
                    'flat_rate:14'
                   ],
        ],
        'half pallet' => [
            169 => [
                    'pakkelabels_shipping_gls_private',
                    'pakkelabels_shipping_postnord_private',
                    'pakkelabels_shipping_gls',
                    'pakkelabels_shipping_pdk',
                    'flat_rate:15'
                   ],
        ],
        'quarter pallet' => [
            211 => [
                    'pakkelabels_shipping_gls_private',
                    'pakkelabels_shipping_postnord_private',
                    'pakkelabels_shipping_gls',
                    'pakkelabels_shipping_pdk'
                   ],
        ]
    ],
    'not exists' => [
        'full pallet' => [
            171 => [
                    'flat_rate:12'
                   ]
        ],
        'half pallet' => [
            169 => [
                    'flat_rate:14'
                   ]
        ],
        'quarter pallet' => [
            211 => [
                    'flat_rate:15'
                   ]
        ]
    ]
];

$class_ids[170] = '';
$class_ids[171] = '';

$available_shipping_methods['flat_rate:12'] = 'something';
$available_shipping_methods['flat_rate:14'] = 'somethingelse';

foreach ($method_filters as $filter_type => $pallet_filters) {               // iterate exists/not exists level
    foreach ($pallet_filters as $pallet_type => $shipping_methods) {         // iterate different pallets level
        if ($filter_type == 'exists') {
            $qualifiers = array_intersect_key($shipping_methods, $class_ids);
        } else {
            $qualifiers = array_diff_key($shipping_methods, $class_ids);
        }
        foreach ($qualifiers as $class_id => $method_names) {  // only iterate if there are qualifying class ids
            foreach ($method_names as $method_name) {
                echo "unsetting $method_name\n";
                unset($available_shipping_methods[$method_name]);
            }
        }
    }
}

var_export($available_shipping_methods);

Output for 7.1.25 - 7.1.27, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: unsetting pakkelabels_shipping_gls_private unsetting pakkelabels_shipping_postnord_private unsetting pakkelabels_shipping_gls unsetting pakkelabels_shipping_pdk unsetting flat_rate:15 unsetting flat_rate:14 unsetting flat_rate:14 unsetting flat_rate:15 array ( 'flat_rate:12' => 'something', )
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 unsetting pakkelabels_shipping_gls_private unsetting pakkelabels_shipping_postnord_private unsetting pakkelabels_shipping_gls unsetting pakkelabels_shipping_pdk unsetting flat_rate:15 unsetting flat_rate:14 unsetting flat_rate:14 unsetting flat_rate:15 array ( 'flat_rate:12' => 'something', )

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