php implement class and method of instance code with names sorted by initials

php sorts names by initials, as follows:

<?php
public function getFirstChar($s){
$s0 = mb_substr($s,0,3); // Get the last name of the first name 
$s = iconv('UTF-8','gb2312', $s0); // Will UTF-8 Convert to GB2312 Code 
//dump($s0);
if (ord($s0)>128) { // Beginning with Chinese characters, Chinese characters do not begin with U , V Beginning 
$asc=ord($s{0})*256+ord($s{1})-65536;
if($asc>=-20319 and $asc<=-20284)return "A";
if($asc>=-20283 and $asc<=-19776)return "B";
if($asc>=-19775 and $asc<=-19219)return "C";
if($asc>=-19218 and $asc<=-18711)return "D";
if($asc>=-18710 and $asc<=-18527)return "E";
if($asc>=-18526 and $asc<=-18240)return "F";
if($asc>=-18239 and $asc<=-17760)return "G";
if($asc>=-17759 and $asc<=-17248)return "H";
if($asc>=-17247 and $asc<=-17418)return "I";
if($asc>=-17417 and $asc<=-16475)return "J";
if($asc>=-16474 and $asc<=-16213)return "K";
if($asc>=-16212 and $asc<=-15641)return "L";
if($asc>=-15640 and $asc<=-15166)return "M";
if($asc>=-15165 and $asc<=-14923)return "N";
if($asc>=-14922 and $asc<=-14915)return "O";
if($asc>=-14914 and $asc<=-14631)return "P";
if($asc>=-14630 and $asc<=-14150)return "Q";
if($asc>=-14149 and $asc<=-14091)return "R";
if($asc>=-14090 and $asc<=-13319)return "S";
if($asc>=-13318 and $asc<=-12839)return "T";
if($asc>=-12838 and $asc<=-12557)return "W";
if($asc>=-12556 and $asc<=-11848)return "X";
if($asc>=-11847 and $asc<=-11056)return "Y";
if($asc>=-11055 and $asc<=-10247)return "Z";
}else if(ord($s)>=48 and ord($s)<=57){ // Number beginning 
switch(iconv_substr($s,0,1,'utf-8')){
case 1:return "Y";
case 2:return "E";
case 3:return "S";
case 4:return "S";
case 5:return "W";
case 6:return "L";
case 7:return "Q";
case 8:return "B";
case 9:return "J";
case 0:return "L";
}
}else if(ord($s)>=65 and ord($s)<=90){ // Capital English beginning 
return substr($s,0,1);
}else if(ord($s)>=97 and ord($s)<=122){ // Lowercase English beginning 
return strtoupper(substr($s,0,1));
}
else
{
return iconv_substr($s0,0,1,'utf-8');
// Chinese-English mixed words are not suitable for the above situations, so the first character can be extracted directly 
}
}
public function addPeople()
{
$userName = array(' Zhang 3',' Ma Dashuai ',' Li 4',' Wang 5',' Small 2',' Cat's egg ',' Dog egg ',' King flower ','3 Hair ',' Xiao Ming ',' Li Gang ',' Zhang Fei ');
sort($userName);
foreach($userName as $name){
$char = $this->getFirstChar($name);
$nameArray = array();
if(count($charArray[$char])!=0){
$nameArray = $charArray[$char];
}
array_push($nameArray,$name);
$charArray[$char] = $nameArray;
}
ksort($charArray);
$this->assign('_list',$charArray);
}

Page display

<foreach name="_list" item="vo" key="k">
<p>{$k}</p>
<foreach name="vo" item="l">
<span class="name">{$l}</span>
</foreach>
</foreach>

Summarize