常用php函数，来自互联网

function getFirstCharter($str){

    if(empty($str)){return '';}

    $fchar=ord($str{0});

    if($fchar>=ord('A')&&$fchar<=ord('z')) return strtoupper($str{0});

    $s1=iconv('UTF-8','gb2312',$str);

    $s2=iconv('gb2312','UTF-8',$s1);

    $s=$s2==$str?$s1:$str;

    $asc=ord($s{0})*256+ord($s{1})-65536;

    if($asc>=-20319&&$asc<=-20284) return 'A';

    if($asc>=-20283&&$asc<=-19776) return 'B';

    if($asc>=-19775&&$asc<=-19219) return 'C';

    if($asc>=-19218&&$asc<=-18711) return 'D';

    if($asc>=-18710&&$asc<=-18527) return 'E';

    if($asc>=-18526&&$asc<=-18240) return 'F';

    if($asc>=-18239&&$asc<=-17923) return 'G';

    if($asc>=-17922&&$asc<=-17418) return 'H';

    if($asc>=-17417&&$asc<=-16475) return 'J';

    if($asc>=-16474&&$asc<=-16213) return 'K';

    if($asc>=-16212&&$asc<=-15641) return 'L';

    if($asc>=-15640&&$asc<=-15166) return 'M';

    if($asc>=-15165&&$asc<=-14923) return 'N';

    if($asc>=-14922&&$asc<=-14915) return 'O';

    if($asc>=-14914&&$asc<=-14631) return 'P';

    if($asc>=-14630&&$asc<=-14150) return 'Q';

    if($asc>=-14149&&$asc<=-14091) return 'R';

    if($asc>=-14090&&$asc<=-13319) return 'S';

    if($asc>=-13318&&$asc<=-12839) return 'T';

    if($asc>=-12838&&$asc<=-12557) return 'W';

    if($asc>=-12556&&$asc<=-11848) return 'X';

    if($asc>=-11847&&$asc<=-11056) return 'Y';

    if($asc>=-11055&&$asc<=-10247) return 'Z';

    return null;

}



公司同事整理的类,挺实用的.相信拿出来分享下他不会介意的O(∩_∩)O.不过如果首字母是数字或英文会有些问题.

/**

 * Helper_Spell 汉字拼音首字母工具类

 *

 * @category Helper

 * @package  Helper_Spell

 * @author   Lancer <lancer.he@gmail.com>

 * @version  1.0

 * @see      Translation_Big2gb

 */

class Helper_Spell {

 

    /**

     * $_pinyins

     * @var array

     * @access private

     */

    private $_pinyins = array(

        176161 => 'A',

        176197 => 'B',

        178193 => 'C',

        180238 => 'D',

        182234 => 'E',

        183162 => 'F',

        184193 => 'G',

        185254 => 'H',

        187247 => 'J',

        191166 => 'K',

        192172 => 'L',

        194232 => 'M',

        196195 => 'N',

        197182 => 'O',

        197190 => 'P',

        198218 => 'Q',

        200187 => 'R',

        200246 => 'S',

        203250 => 'T',

        205218 => 'W',

        206244 => 'X',

        209185 => 'Y',

        212209 => 'Z',

        215249 => 'Z',

    );

 

    /**

     * $_charset

     * @var string

     * @access private

     */

    private $_charset = null;

 

 

    /**

     * __construct 构造函数, 指定需要的编码 default: utf-8 支持utf-8, gb2312

     *

     * @param unknown_type $charset

     */

    public function __construct( $charset = 'utf-8' ) {

        $this->_charset = $charset;

    }

 

 

    /**

     * getInitialsFirst 返回首个汉字的拼音

     *

     * @access public

     * @static

     * @param  string $str

     * @return string

     * @example Helper_Spell::getInitialsFirst('我的爱'); => w

     */

    public static function getInitialsFirst( $str, $charset = 'utf-8' ) {

        $chars = array(

            'A','B','C','D','E','F',

            'G','H','I','J','K','L',

            'M','N','O','P','Q','R',

            'S','T','U','V','W','X',

            'Y','Z');

 

        $string = self::getInitials( $str );

        $length = strlen($string);

 

        for($i=0; $i < $length; $i++) {

            if ( in_array( $string{$i}, $chars ) ) {

                return $string{$i};

            }

        }

        return '*';

    }

 

 

    /**

     * getInitials 返回拼音组合

     *

     * @access public

     * @static

     * @param  string $str

     * @return string

     * @example Helper_Spell::getInitials('我的爱'); => wda

     */

    public static function getInitials( $str, $charset = 'utf-8' ) {

        $instance = new Helper_Spell( $charset );

        return $instance->_getInitials( $str );

    }

 

 

    /**

     * _getInitials 获取中文字串的拼音首字符

     *              注：英文的字串：不变返回(包括数字)    eg .abc123 => abc123

     *                  中文字符串：返回拼音首字符        eg. 王小明 => WXM

     *                  中英混合串: 返回拼音首字符和英文  eg. 我i我j => WIWJ

     *

     * @access private

     * @param  string $str

     * @return string

     */

    private function _getInitials( $str, $translation=TRUE ){

        if ( empty($str) ) return '';

        if ( $this->_isAscii($str[0]) && $this->_isAsciis( $str ))

            return $str;

 

        if ( $translation )

            $str = Translation_Big2gb::big2gb( $str );

 

        $result = array();

        if ( $this->_charset == 'utf-8' ){

            //IGNORE很重要，加上这个就可以是ICONV()函数忽略错误，继续执行

            $str = iconv( 'utf-8', 'gbk//IGNORE', $str );

        }

        $words = $this->_cutWord( $str );

 

        foreach ( $words AS $word ) {           

            if ( $this->_isAscii($word) ) {//非中文

                $result[] = $word;

                continue;

            }

            $code = ( ord(substr($word,0,1)) ) * 1000 + (ord(substr($word,1,1)));

            //获取拼音首字母A--Z

 

            if ( ($i = $this->_search($code)) != -1 ){

                $result[] = $this->_pinyins[$i];

            }

        }

        return strtoupper(implode('', $result));

    }

 

 

    /**

     * _msubstr 获取中文字符串

     *

     * @access private

     * @param string $str

     * @param int    $start

     * @param int    $len

     * @return string

     */

    private function _msubstr ($str, $start, $len) {

        $start  = $start * 2;

        $len    = $len * 2;

        $strlen = strlen($str);

        $result = '';

        for ( $i = 0; $i < $strlen; $i++ ) {

            if ( $i >= $start && $i < ($start + $len) ) {

                if ( ord(substr($str, $i, 1)) > 129 ) $result .= substr($str, $i, 2);

                else $result .= substr($str, $i, 1);

            }

            if ( ord(substr($str, $i, 1)) > 129 ) $i++;

        }

        return $result;

    }

 

 

    /**

     * _cutWord  字符串切分为数组 (汉字或者一个字符为单位)

     *

     * @access private

     * @param string $str

     * @return array

     */

    private function _cutWord( $str ) {

        $words = array();

        while ( $str != "" ) {

            if ( $this->_isAscii($str) ) {//非中文

                $words[] = $str[0];

                $str = substr( $str, strlen($str[0]) );

            } else {

                $word = $this->_msubstr( $str, 0, 1 );

                $words[] = $word;

                $str = substr( $str,  strlen($word) );

            }

         }

         return $words;

    }

 

 

    /**

     * _isAscii 判断字符是否是ascii字符

     *

     * @access private

     * @param  string $char

     * @return bool

     */

    private function _isAscii( $char ) {

        return ( ord( substr($char,0,1) ) < 160 );

    }

 

 

    /**

     * _isAsciis 判断字符串前3个字符是否是ascii字符

     *

     * @access private

     * @param  string $str

     * @return bool

     */

    private function _isAsciis( $str ) {

        $len = strlen($str) >= 3 ? 3: 2;

        $chars = array();

        for( $i = 1; $i < $len -1; $i++ ){

            $chars[] = $this->_isAscii( $str[$i] ) ? 'yes':'no';

        }

        $result = array_count_values( $chars );

        if ( empty($result['no']) ){

            return true;

        }

        return false;

    }

 

 

 

    /**

     * _getChar 通过ASC码返回字母或者数字

     *

     * @access private

     * @param  string $ascii

     * @return string

     */

    private function _getChar( $ascii ){

        if ( $ascii >= 48 && $ascii <= 57 ) {

            return chr($ascii);  //数字

        } elseif ( $ascii>=65 && $ascii<=90 ) {

            return chr($ascii);   // A--Z

        } elseif ($ascii>=97 && $ascii<=122 ) {

            return chr($ascii-32); // a--z

        } else {

            return '~'; //其他

        }

    }

 

 

    /**

     * _search 查找需要的汉字内码(gb2312) 对应的拼音字符(二分法)

     *

     * @access private

     * @param int $code

     * @return int

     */

    private function _search( $code ) {    

        $data = array_keys($this->_pinyins);

 

        $lower = 0;

        $upper = sizeof($data)-1;

 

        // 排除非一级汉字

        if ($code < $data[0] || $code > $data[23]) return -1;

 

        for (;;) {         

            if ( $lower > $upper ){             

                return $data[$lower-1];

            }

            $middle = (int) round(($lower + $upper) / 2);

            if ( !isset($data[$middle]) ) {          

                return -1;

            }

 

            if ( $data[$middle] < $code ){

                $lower = (int)$middle + 1;

            } else if ( $data[$middle] == $code ) {           

                return $data[$middle];

            } else {

                $upper = (int)$middle - 1;

            }

        }// end for

    }

}