Online PHP editor | rfc for ulN1W

@ 2020-11-13T00:29:14Z

<?php

$input = [
     1 => [
         11 => [
             111 => ['res_id' => 111, 'city_id' => 11, 'country_id' => 1],
             112 => ['res_id' => 112, 'city_id' => 11, 'country_id' => 1],
             113 => ['res_id' => 113, 'city_id' => 11, 'country_id' => 1],
         ],
         12 => [
             121 => ['res_id' => 121, 'city_id' => 12, 'country_id' => 1],
         ],
     ],
     2 => [
         21 => [
             212 => ['res_id' => 212, 'city_id' => 21, 'country_id' => 2],
             214 => ['res_id' => 214, 'city_id' => 21, 'country_id' => 2],
         ],
         22 => [
             221 => ['res_id' => 221, 'city_id' => 22, 'country_id' => 2],
             222 => ['res_id' => 222, 'city_id' => 22, 'country_id' => 2],
             223 => ['res_id' => 223, 'city_id' => 22, 'country_id' => 2],
         ],
     ],
     3 => [
         31 => [
             312 => ['res_id' => 312, 'city_id' => 21, 'country_id' => 2],
             314 => ['res_id' => 314, 'city_id' => 21, 'country_id' => 2],
         ],
     ]
];

function array_filter_clean(array $array, array $callbacks, $currentDepth = 0, $currentKey = '') {
    if (array_key_exists($currentDepth, $callbacks)) { // identify node to apply callback to
        $callback = $callbacks[$currentDepth];
        if (!$callback($currentKey, $array)) { // empty node when callback returns false (or falsy)
            return [];
        }
    }
    
    foreach ($array as $key => &$value) { // &value to modify $array
        if (is_array($value)) {
            $value = array_filter_clean($value, $callbacks, $currentDepth+1, $key); // recurse if array
        }
    }
    
    return array_filter($array); // remove empty nodes (you may want to add "afterCallbacks" here)
}

$callbacksByDepth = [
    /* 2 => function ($key, $value) {
        return $key > 20;
    }, */
    3 => function ($key, $value) {
        return $value['res_id']%2;
    },
];

$output = array_filter_clean($input, $callbacksByDepth);

print_r($output);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [1] => Array ( [11] => Array ( [111] => Array ( [res_id] => 111 [city_id] => 11 [country_id] => 1 ) [113] => Array ( [res_id] => 113 [city_id] => 11 [country_id] => 1 ) ) [12] => Array ( [121] => Array ( [res_id] => 121 [city_id] => 12 [country_id] => 1 ) ) ) [2] => Array ( [22] => Array ( [221] => Array ( [res_id] => 221 [city_id] => 22 [country_id] => 2 ) [223] => Array ( [res_id] => 223 [city_id] => 22 [country_id] => 2 ) ) ) )

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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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