php实现编码的转换

原创

2016-06-08 17:30:21 776浏览

php实现编码的转换,这里会把gb2312转换成utf-8

function gb2utf8($gb) {
if( !trim($gb) ) return $gb;
$utf8='';
while($gb) {
if( ord(substr($gb,0,1)) > 127 ) {
$t=substr($gb,0,2);
$gb=substr($gb,2);
$utf8 .= $this->u2utf8($this->codetable[hexdec(bin2hex($t))-0x8080]);
}
else {
$t=substr($gb,0,1);
$gb=substr($gb,1);
$utf8 .= $this->u2utf8($t);
}
}
return $utf8;
}

function u2utf8($c) {
$str='';
if ($c < 0x80) {
$str.=$c;
}
else if ($c < 0x800) {
$str.=chr(0xC0 | $c>>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;
}

} 说一点,编码集我就不写出来了,用for一下就知道了.