utf-8和unicode互转的算法的php实现。以及php的escape函数
---------------------------------------------------------------
>6);
$str.=chr(0x80 ¦ $c & 0x3F);
} else if ($c < 0x10000) {
$str.=chr(0xE0 ¦ $c>>12);
$str.=chr(0x80 ¦ $c>>6 & 0x3F);
$str.=chr(0x80 ¦ $c & 0x3F);
} else if ($c < 0x200000) {
$str.=chr(0xF0 ¦ $c>>18);
$str.=chr(0x80 ¦ $c>>12 & 0x3F);
$str.=chr(0x80 ¦ $c>>6 & 0x3F);
$str.=chr(0x80 ¦ $c & 0x3F);
}
return $str;
}
?>
```
/**
* php版的javascript同名函数
**/
if(! function_exists("unescape")):
function unescape($str) {
$str = rawurldecode($str);
preg_match_all("/%u.{4} ¦&#x.{4}; ¦&#\d+; ¦&#\d+? ¦.+/U",$str,$r);
$ar = $r[0];
foreach($ar as $k=>$v) {
if(substr($v,0,2) == "%u")
$ar[$k] = iconv("UCS-2","GBK",pack("H4",substr($v,-4)));
elseif(substr($v,0,3) == "&#x")
$ar[$k] = iconv("UCS-2","GBK",pack("H4",substr($v,3,-1)));
elseif(substr($v,0,2) == "&#") {
$ar[$k] = iconv("UCS-2","GBK",pack("n",preg_replace("/[^\d]/","",$v)));
}
}
return join("",$ar);
}
endif;
/**
* php版的javascript同名函数
**/
if(! function_exists("escape")):
function escape($str) {
preg_match_all("/[\x80-\xff]. ¦[\x01-\x7f]+/",$str,$r);
$ar = $r[0];
foreach($ar as $k=>$v) {
if(ord($v[0]) < 128)
$ar[$k] = rawurlencode($v);
else
$ar[$k] = "%u".bin2hex(iconv("GB2312","UCS-2",$v));
}
return join("",$ar);
}
endif;
```