Online PHP editor | output for qrOpi

@ 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 7.1.25 - 7.1.33, 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 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0 - 8.5.1: 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', ), )
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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