根据中文姓名或者其他中英文混合字符串获取拼音首字母

<?php /** * Modified by fuyong @ 2015-09-13 * 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 pinyinfirstchar(); * $result = $py->getInitials('我想和你在一起'); * $result = $py->getFirstchar('小时候我就想和你在一起'); */ //下面3行测试代码 $py = new pinyinfirstchar(); $result = $py->getFirstchar('根据中文姓名'); print_r($result); class pinyinfirstchar { 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', '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)); } 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; } } } /** * 获取一整串中文字串的拼音首字符（只返回1个字符） * * @param string $str * @return string */ public function getFirstchar( $str ) { if ( empty($str) ) return ''; return substr($this->getInitials($str), 0, 1); } } ?>