PHP는 문자열을 대문자 함수 strtoupper()로 변환합니다.

<?php
echo strtoupper("Hello WORLD!");
?>

strtoupper(string)

 public function set_kw($kw){
        $_intAsc=ord(substr($kw,0,1));
        if(($_intAsc>64 and $_intAsc<91)or($_intAsc>96 and $_intAsc<123)){
            $this->set_query_q(&#39;pinyin:&#39;.strtoupper($kw).&#39;*&#39;);
        }else{
            $this->set_dismax_model();
            $this->set_query_q($kw);
            $this->set_query_qf("name^10 address^5");
        }
    }