PHP匹配当前传入是何种类型

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/**
 * [is_string_regular_type 正则自动验证传入数据]
 * @E-mial wuliqiang_aa@163.com
 * @TIME   2017-08-25
 * @WEB    http://blog.iinu.com.cn
 * @param  [string]  $keyword [传入的关键字要检索的范围]
 * @param  [string]  $string  [需要用正则匹配的内容]
 * @return boolean          [返回数组状态]
 */
function is_string_regular_type($keyword,$string){
    $type_array = array(
            //邮箱正则
            'email'    => [ 'type' => '/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/'],
            //用户名
            'username' => [ 'type' => '/^\w+((-\w+)|(\.\w+))*[0-9a-zA-Z_]/' , 'number' => '/^\w+((-\w+)|(\.\w+))*[0-9a-zA-Z_]{6,20}/'],
            //密码
            'password' => [ 'type' => '/^[0-9a-zA-Z_]{6,20}$/']
        );
    $return_str_success = array(
            'email'    => ['type'=>'邮箱格式正确'],
            'username' => ['type'=>'用户名格式正确','number'=>'用户名长度正确'],
            'password' => ['type'=>'密码格式正确']
        );
    $return_str_error = array(
            'email'    => ['type'=>'邮箱格式不正确'],
            'username' => ['type'=>'用户名格式不正确','number'=>'用户名长度不正确'],
            'password' => ['type'=>'密码格式不正确']
        );
    //用于匹配是否存在该键
    foreach($type_array as $k=>$v){
        $type_array_if[] = $k;
    }
    if(in_array($keyword,$type_array_if)){
        foreach($type_array[$keyword] as $k=>$v){
            //正则比配
            $preg_match_chek = preg_match($type_array[$keyword][$k],$string);
        }
        if($preg_match_chek == 1){
            //匹配成功
            return array('status'=>$preg_match_chek,'result'=>$return_str_success[$keyword][$k],'message'=>$string);
        }else{
            //匹配失败
            return array('status'=>$preg_match_chek,'result'=>$return_str_error[$keyword][$k],'message'=>$string);
        }
    }else{
        return array('status'=>1,'result'=>'不存在此验证方法','message'=>$string);
    }
}

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