PHP下escape解码函数的实现方法_php技巧

<br>function unescape($str) { <br>$str = rawurldecode($str); <br>preg_match_all("/%u.{4}|&#x.{4};|&#d+;|.+/U",$str,$r); <br>$ar = $r[0]; <br>foreach($ar as $k=>$v) { <br>if(substr($v,0,2) == "%u") <br>$ar[$k] = iconv("UCS-2","GBK",pack("H4",substr($v,-4))); <br>elseif(substr($v,0,3) == "&#x") <br>$ar[$k] = iconv("UCS-2","GBK",pack("H4",substr($v,3,-1))); <br>elseif(substr($v,0,2) == "&#") { <br>$ar[$k] = iconv("UCS-2","GBK",pack("n",substr($v,2,-1))); <br>} <br>} <br>return join("",$ar); <br>} <br> <br>UTF8编码： <br><span><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br>function unescape($str){ <br>$ret = ''; <br>$len = strlen($str); <br>for ($i = 0; $i < $len; $i++){ <br>if ($str[$i] == '%' && $str[$i+1] == 'u'){ <br>$val = hexdec(substr($str, $i+2, 4)); <br>if ($val < 0x7f) $ret .= chr($val); <br>else if($val < 0x800) $ret .= chr(0xc0|($val>>6)).chr(0x80|($val&0x3f)); <br>else $ret .= chr(0xe0|($val>>12)).chr(0x80|(($val>>6)&0x3f)).chr(0x80|($val&0x3f)); <br>$i += 5; <br>} <br>else if ($str[$i] == '%'){ <br>$ret .= urldecode(substr($str, $i, 3)); <br>$i += 2; <br>} <br>else $ret .= $str[$i]; <br>} <br>return $ret; <br>} <br>                    </li></ol></pre>