php 获取中文字符串的拼音打头字母代码,PHP代码库,德仔网

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【PHP】 php 获取中文字符串的拼音打头字母
作者: / 发布于2011/3/15/ 715
<div>* 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
 * eg.
 * $py = new PYInitials();
 * $result = $py->getInitials('王小明');
 */
 class PYInitials
 {
 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, $i, 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);
 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;
 }
 }// end for
 }
 }
 ?></div>
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