本文实例讲述了PHP实现Unicode编码相互转换的方法。分享给大家供大家参考，具体如下：
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<?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.zzvips.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 $unistr2 . '<br />';
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PS：下面测试过这个函数比较好用，该代码需要在utf-8编码环境下运行
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function unicode_encode($name) {//Unicode编码
$jsonarr = array($name);
$jsonstr = json_encode($jsonarr);
if (empty ($jsonstr))
return '';
return substr($jsonstr,2,-2);
}
function unicode_decode($name) {//Unicode解码
$json = '{"str":"' . $name . '"}';
$arr = json_decode($json, true);
if (empty ($arr))
return '';
return $arr['str'];
}
$test = "\u811a\u672c\u4e4b\u5bb6";
echo "unicode解码：".unicode_decode($test)."<br/>";
echo "unicode编码：".unicode_encode('服务器之家')."<br/>";
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希望本文所述对大家PHP程序设计有所帮助。