用preg_match实现PHP多维数组搜索

function searchArray($needle, $haystack) {
    foreach ($haystack as $key => $value) {
        if ($value === $needle) {
            return $key;
        } elseif (is_array($value)) {
            $result = searchArray($needle, $value);
            if ($result !== false) {
                return $key . '.' . $result;
            }
        }
    }
    return false;
}

$myArray = array(
    'a' => array(
        'b' => 'value1',
        'c' => 'value2'
    ),
    'd' => array(
        'e' => 'value3',
        'f' => 'value4'
    )
);

$searchValue = 'value3';
$result = searchArray($searchValue, $myArray);

if ($result !== false) {
    echo "Found at key: " . $result;
} else {
    echo "Not found";
}