php获取中文字符拼音首字母实例

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; 
}

<?php 
 
$limit=array( //gb2312 拼音排序 
    array(45217,45252), //A 
    array(45253,45760), //B 
    array(45761,46317), //C 
    array(46318,46825), //D 
    array(46826,47009), //E 
    array(47010,47296), //F 
    array(47297,47613), //G 
    array(47614,48118), //H 
    array(0,0),         //I 
    array(48119,49061), //J 
    array(49062,49323), //K 
    array(49324,49895), //L 
    array(49896,50370), //M 
    array(50371,50613), //N 
    array(50614,50621), //O 
    array(50622,50905), //P 
    array(50906,51386), //Q 
    array(51387,51445), //R 
    array(51446,52217), //S 
    array(52218,52697), //T 
    array(0,0),         //U 
    array(0,0),         //V 
    array(52698,52979), //W 
    array(52980,53688), //X 
    array(53689,54480), //Y 
    array(54481,55289), //Z 
); 
 
$str="A:这是一个测试程序1"; 
$str= iconv("UTF-8","gb2312", $str); 
echo $str."</br>"; 
$i=0; 
while($i<strlen($str) ) { 
    $tmp=bin2hex(substr($str,$i,1)); 
    if($tmp>=&#39;B0&#39;){ //汉字的开始 
        $t=getLetter(hexdec(bin2hex(substr($str,$i,2)))); 
        printf("%c",$t==-1 ? &#39;*&#39; : $t ); 
        $i+=2; 
    } 
    else{ 
        printf("%s",substr($str,$i,1)); 
        $i++; 
    } 
} 
 
function getLetter($num){ 
    global $limit; 
    $char_index=65; 
    foreach($limit as $k=>$v){ 
        if($num>=$v[0] && $num<=$v[1]){ 
            $char_index+=$k; 
            return $char_index; 
        } 
    } 
    return -1; 
}