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@ 2019-07-03T14:17:39Z

<?php
$cityID = '2';
$oldCityFound = false;
$newCityFound = false;
$arr = [
        '1' => ['ID'=>'1', 'NAME'=>'Moscow', 'UF_DEFAULT'=>'1', 'UF_CITY_CORD'=>'55.76, 37.64'],
        '2' => ['ID'=>'2', 'NAME'=>'Tver', 'UF_DEFAULT'=>'0', 'UF_CITY_CORD'=>'55.76, 37.64'],
        '3' => ['ID'=>'3', 'NAME'=>'Nahodka', 'UF_DEFAULT'=>'0', 'UF_CITY_CORD'=>'55.76, 37.64'],
        '4' => ['ID'=>'4', 'NAME'=>'Omsk', 'UF_DEFAULT'=>'0', 'UF_CITY_CORD'=>'55.76, 37.64'],
];
foreach ($arr as &$row) {
    if ($row['ID'] == $cityID) {
        if ($row['UF_DEFAULT'] == 1) {
            break; // nothing to change
        }
        $row['UF_DEFAULT'] = 1;
        $newCityFound = true;
    } elseif ($row['UF_DEFAULT'] == 1) {
        $row['UF_DEFAULT'] = 0;
        $oldCityFound = true;
    }
    if ($newCityFound && $oldCityFound) {
        break; // both jobs done ...efficiently
    }
}
unset($row); // best practice
var_export($arr);

Output for git.master, git.master_jit, rfc.property-hooks: array ( 1 => array ( 'ID' => '1', 'NAME' => 'Moscow', 'UF_DEFAULT' => 0, 'UF_CITY_CORD' => '55.76, 37.64', ), 2 => array ( 'ID' => '2', 'NAME' => 'Tver', 'UF_DEFAULT' => 1, 'UF_CITY_CORD' => '55.76, 37.64', ), 3 => array ( 'ID' => '3', 'NAME' => 'Nahodka', 'UF_DEFAULT' => '0', 'UF_CITY_CORD' => '55.76, 37.64', ), 4 => array ( 'ID' => '4', 'NAME' => 'Omsk', 'UF_DEFAULT' => '0', 'UF_CITY_CORD' => '55.76, 37.64', ), )

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2022-12-01 RFC: Property hooks - included in PHP 8.4
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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