PHP实现Unicode编码相互转换的方法示例

<?php/*** $str 原始中文字符串* $encoding 原始字符串的编码，默认utf-8* $prefix 编码后的前缀，默认"&#"* $postfix 编码后的后缀，默认";"*/function unicode_encode($str, $encoding = 'utf-8', $prefix = '&#', $postfix = ';') { //将字符串拆分 $str = iconv("UTF-8", "gb2312", $str); $cind = 0; $arr_cont = array(); for ($i = 0; $i < strlen($str); $i++) {  if (strlen(substr($str, $cind, 1)) > 0) {   if (ord(substr($str, $cind, 1)) < 0xA1) { //如果为英文则取1个字节    array_push($arr_cont, substr($str, $cind, 1));    $cind++;   } else {    array_push($arr_cont, substr($str, $cind, 2));    $cind+=2;   }  } } foreach ($arr_cont as &$row) {  $row = iconv("gb2312", "UTF-8", $row); } //转换Unicode码 foreach ($arr_cont as $key => $value) {  $unicodestr.= $prefix . base_convert(bin2hex(iconv('utf-8', 'UCS-4', $value)), 16, 10) .$postfix; } return $unicodestr;}/*** $str Unicode编码后的字符串* $decoding 原始字符串的编码，默认utf-8* $prefix 编码字符串的前缀，默认"&#"* $postfix 编码字符串的后缀，默认";"*/function unicode_decode($unistr, $encoding = 'utf-8', $prefix = '&#', $postfix = ';') { $arruni = explode($prefix, $unistr); $unistr = ''; for ($i = 1, $len = count($arruni); $i < $len; $i++) {  if (strlen($postfix) > 0) {   $arruni[$i] = substr($arruni[$i], 0, strlen($arruni[$i]) - strlen($postfix));  }  $temp = intval($arruni[$i]);  $unistr .= ($temp < 256) ? chr(0) . chr($temp) : chr($temp / 256) . chr($temp % 256); } return iconv('UCS-2', $encoding, $unistr);}$str = "PHP编程：www.vevb.com";$unistr = unicode_encode($str);$unistr2 = unicode_decode($unistr);echo $unistr . '<br />';echo $unistr2 . '<br />';$unistr = unicode_encode($str,'GBK','//u');$unistr2 = unicode_decode($unistr,'GBK','//u');echo $unistr . '<br />';echo $unistr2 . '<br />';