Get the first Chinese initial letter in php and sort it

It’s been a long time since I updated my blog. I still feel that my work needs to be summarized more. Today I will update a question that I think is more successful.
I am doing stored value settlement recently, and the settlement homepage needs to be sorted by the initial letters of the stores A-Z. My data structure was originally like this:

Php code

Array  
(  
    [0] => Array  
        (  
            [sid] => 2885842  
            [recetcstoredpay] => 24000  
            [recetclprinciple] => 23465  
            [paytcstoredpay] => 5455  
            [paytclprinciple] => 34900  
            [sname] => 百宴餐饮---便宜坊烤鸭店  
        )  
  
    [1] => Array  
        (  
            [sid] => 3644191  
            [recetcstoredpay] => 89200  
            [recetclprinciple] => 406930  
            [paytcstoredpay] => 4090  
            [paytclprinciple] => 97800  
            [sname] => 大长秋餐饮中心  
        )  
  
    [2] => Array  
        (  
            [sid] => 5229673  
            [recetcstoredpay] => 26000  
            [recetclprinciple] => 45930  
            [paytcstoredpay] => 24795  
            [paytclprinciple] => 121800  
            [sname] => 大众点评网  
        )  
  
    [3] => Array  
        (  
            [sid] => 3715927  
            [recetcstoredpay] => 13600  
            [recetclprinciple] => 56930  
            [paytcstoredpay] => 5710  
            [paytclprinciple] => 37800  
            [sname] => 江东北路店  
        )  
  
    [4] => Array  
        (  
            [sid] => 3671092  
            [recetcstoredpay] => 1280  
            [recetclprinciple] => 46930  
            [paytcstoredpay] => 128090  
            [paytclprinciple] => 149800  
            [sname] => 金凤区新馆  
        )  
  
    [5] => Array  
        (  
            [sid] => 1858783  
            [recetcstoredpay] => 2040  
            [recetclprinciple] => 4465  
            [paytcstoredpay] => 245  
            [paytclprinciple] => 4900  
            [sname] => 浙江西子宾馆  
        )  
  
    [6] => Array  
        (  
            [sid] => 16832117  
            [recetcstoredpay] => 81600  
            [recetclprinciple] => 470930  
            [paytcstoredpay] => 506090  
            [paytclprinciple] => 8000  
            [sname] => 欢乐谷店  
        )  
  
)

According to the requirements, if I want to sort according to the first letter of the first Chinese character in sname, I first need to write a method to get the first letter:

Php code

/** 
    * 取汉字的第一个字的首字母 
    * @param type $str 
    * @return string|null 
    */  
   public function _getFirstCharter($str){  
if(emptyempty($str)){return '';}  
$fchar=ord($str{0});  
if($fchar>=ord(&#39;A&#39;)&&$fchar<=ord(&#39;z&#39;)) return strtoupper($str{0});  
$s1=iconv(&#39;UTF-8&#39;,&#39;gb2312&#39;,$str);  
$s2=iconv(&#39;gb2312&#39;,&#39;UTF-8&#39;,$s1);  
$s=$s2==$str?$s1:$str;  
$asc=ord($s{0})*256+ord($s{1})-65536;  
if($asc>=-20319&&$asc<=-20284) return &#39;A&#39;;  
if($asc>=-20283&&$asc<=-19776) return &#39;B&#39;;  
if($asc>=-19775&&$asc<=-19219) return &#39;C&#39;;  
if($asc>=-19218&&$asc<=-18711) return &#39;D&#39;;  
if($asc>=-18710&&$asc<=-18527) return &#39;E&#39;;  
if($asc>=-18526&&$asc<=-18240) return &#39;F&#39;;  
if($asc>=-18239&&$asc<=-17923) return &#39;G&#39;;  
if($asc>=-17922&&$asc<=-17418) return &#39;H&#39;;  
if($asc>=-17417&&$asc<=-16475) return &#39;J&#39;;  
if($asc>=-16474&&$asc<=-16213) return &#39;K&#39;;  
if($asc>=-16212&&$asc<=-15641) return &#39;L&#39;;  
if($asc>=-15640&&$asc<=-15166) return &#39;M&#39;;  
if($asc>=-15165&&$asc<=-14923) return &#39;N&#39;;  
if($asc>=-14922&&$asc<=-14915) return &#39;O&#39;;  
if($asc>=-14914&&$asc<=-14631) return &#39;P&#39;;  
if($asc>=-14630&&$asc<=-14150) return &#39;Q&#39;;  
if($asc>=-14149&&$asc<=-14091) return &#39;R&#39;;  
if($asc>=-14090&&$asc<=-13319) return &#39;S&#39;;  
if($asc>=-13318&&$asc<=-12839) return &#39;T&#39;;  
if($asc>=-12838&&$asc<=-12557) return &#39;W&#39;;  
if($asc>=-12556&&$asc<=-11848) return &#39;X&#39;;  
if($asc>=-11847&&$asc<=-11056) return &#39;Y&#39;;  
if($asc>=-11055&&$asc<=-10247) return &#39;Z&#39;;  
return null;  
   }

Then the next step is to sort this two-dimensional data. I thought about it for a long time, and then I came up with a plan. First, call this method to get the first letter in the loop, and then use this letter as the key. Because there is a method of sorting according to the key in PHP, so my code is written like this:

Php code

//门店名称  
           $shopData = $this->_shopNamesArray;    
             
           //根据门店名称第一个汉字的首字母正序排序  
           $settles = $result['data'];  
        
           $settlesRes = array();  
           foreach ($settles as $sett) {  
               $sname = $shopData[$sett['sid']];  
               $sett['sname'] = $sname;    
               $snameFirstChar = $this->_getFirstCharter($sname); //取出门店的第一个汉字的首字母  
               $settlesRes[$snameFirstChar] = $sett;//以这个首字母作为key  
           }              
           ksort($settlesRes); //对数据进行ksort排序，以key的值升序排序

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