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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 git.master, git.master_jit, rfc.property-hooks: 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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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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