php获取汉字首字母的函数

来源：互联网发布：阿里大数据行业分析编辑：程序博客网时间：2024/06/10 18:03
来源：http://www.poluoluo.com/jzxy/201311/248685.html
<?php /*** Modified by http://iulog.com @ 2013-05-07* 修复二分法查找方法* 汉字拼音首字母工具类*  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. 测试字符串 => CSZFC*      中英混合串: 返回拼音首字符和英文   eg. 我i我j => WIWJ*  eg.*  $py = new str2PY();*  $result = $py->getInitials('啊吧才的饿飞就好i就看了吗你哦平去人是他uv我想一在');*/class str2PY{    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',    );    private $_charset = null;    /**     * 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;    }    /**     * 中文字符串 substr     *     * @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;    }    /**     * 字符串切分为数组 (汉字或者一个字符为单位)     *     * @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;    }    /**     * 判断字符是否是ascii字符     *     * @param string $char     * @return bool     */    private function _isAscii( $char )    {        return ( ord( substr($char,0,1) ) < 160 );    }    /**     * 判断字符串前3个字符是否是ascii字符     *     * @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;    }    /**     * 获取中文字串的拼音首字符     *     * @param string $str     * @return string     */    public function getInitials( $str )    {        if ( empty($str) ) return '';        if ( $this->_isAscii($str[0]) && $this->_isAsciis( $str )){            return $str;        }        $result = array();        if ( $this->_charset == 'utf-8' ){            $str = iconv( 'utf-8', 'gb2312', $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));    }    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*/        }    }    /**     * 查找需要的汉字内码(gb2312) 对应的拼音字符( 二分法 )     *     * @param int $code     * @return int     */    private function _search( $code )    {        $data = array_keys($this->_pinyins);        $lower = 0;        $upper = sizeof($data)-1;  $middle = (int) round(($lower + $upper) / 2);        if ( $code < $data[0] ) return -1;        for (;;) {            if ( $lower > $upper ){                return $data[$lower-1];            }            $tmp = (int) round(($lower + $upper) / 2);            if ( !isset($data[$tmp]) ){    return $data[$middle];            }else{    $middle = $tmp;   }            if ( $data[$middle] < $code ){                $lower = (int)$middle + 1;            }else if ( $data[$middle] == $code ) {                return $data[$middle];            }else{                $upper = (int)$middle - 1;            }        }    }}?>
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