<?php /** * 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('周杰伦'); * *  //获取首字母 *  $result = $py->getFirstString('abc');  //A *  $resutl = $py->getFirstString("周杰伦"); //Z * */ class str2py {     private $_pinyins = array( => 'A', => 'B', => 'C', => 'D', => 'E', => 'F', => 'G', => 'H', => 'J', => 'K', => 'L', => 'M', => 'N', => 'O', => 'P', => 'Q', => 'R', => 'S', => 'T', => 'W', => 'X', => 'Y', => '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));     }     /**      *  20140624 wangtianbao 获取首字母      *  @param string $str      *  @return string      */     public function getFirstString($str)     {         //先把中文转换成字母         $new_string = $this->getInitials($str);         if (empty($new_string))         {             return '';         }         else         {             return strtoupper(substr($new_string, 0, 1));         }     }     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;             }         }     } }