代码很简单，这里就不多BB了，大家看注释吧，注释都看不懂的小伙伴，求放过PHP！！！
复制代码 代码如下:<?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; } } }}
取汉字首字母算是目前几乎没个项目中都需要用到的功能了，这里给大家推荐的是效率比较高的代码，也是在本人项目中使用的，小伙伴们如发现问题，还请留言，大家共同进步
