PHP中未返回预期结果的多维数组多值搜索

function multiValueSearch($array, $searchValue) {
    $results = array();

    foreach ($array as $key => $value) {
        if (is_array($value)) {
            $subResults = multiValueSearch($value, $searchValue);
            $results = array_merge($results, $subResults);
        } elseif ($value == $searchValue) {
            $results[] = $key;
        }
    }

    return $results;
}

// 示例多维数组
$array = array(
    'a' => array(
        'b' => 'value1',
        'c' => 'value2'
    ),
    'd' => array(
        'e' => 'value3',
        'f' => 'value4'
    ),
    'g' => 'value5'
);

// 搜索值为'value2'的键
$results = multiValueSearch($array, 'value2');

// 输出结果
print_r($results);