PHP拆分省市区县字符串为数组

只要满足 省市区 格式的字符串，都能正确拆分

function splitRegion($region)
{
    // 定义匹配省、市、县的模式，注意处理*自治*与直接接地名的情况
    $provincePattern = '/(.*?(?:省|自治区|直辖市|特别行政区))/u';
    $cityPattern = '/(.*?(?:市|自治州))/u';
    $countyPattern = '/(.*?(?:区|县|市|旗|自治县|自治旗))/u';

    $province = '';
    $city = '';
    $county = '';

    if(preg_match($provincePattern, $region, $matches)){
        $province = $matches[1];
        $region = str_replace($province, '', $region);
    }

    if(preg_match($cityPattern, $region, $matches)){
        $city = $matches[1];
        $region = str_replace($city, '', $region);
    }

    $county = trim($region); //为省份和城市之后的所有字符

    return array(
        'province' => trim($province),
        'city' => trim($city),
        'district' => trim($county)
    );
}