一段将GB编码转换为utf8的代码
gb2utf8.php 文件如下:
Class GB2UTF8 { var $gb; // 待转换的GB2312字符串 var $utf8; // 转换后的UTF8字符串 var $CodeTable; // 转换过程中使用的GB2312代码文件数组 var $ErrorMsg; // 转换过程之中的错误讯息
function GB2UTF8($InStr="") { $this->gb=$InStr; $this->SetGb2312(); ($this->gb=="")?0:$this->Convert(); }
function SetGb2312($InStr="gb2312.txt") { // 设置gb2312代码文件,默认为gb2312.txt $this->ErrorMsg=""; $tmp=@file($InStr); if (!$tmp) { $this->ErrorMsg="No GB2312"; return false; } $this->CodeTable=array(); while(list($key,$value)=each($tmp)) { $this->CodeTable[hexdec(substr($value,0,6))]=substr($value,7,6); } } function Convert() { // 转换GB2312字符串到UTF8字符串,需预先设置$gb $this->utf8=""; if(!trim($this->gb) || $this->ErrorMsg!="") { return ($this->utf8=$this->ErrorMsg); } $str=$this->gb;
while($str) { if (ord(substr($str,0,1))>127) { $tmp=substr($str,0,2); $str=substr($str,2,strlen($str)); $tmp=$this->U2UTF8(hexdec($this->CodeTable[hexdec(bin2hex($tmp))-0x8080])); for($i=0;$i<strlen ($tmp);$i+=3) $this->utf8.=chr(substr($tmp,$i,3)); } else { $tmp=substr($str,0,1); $str=substr($str,1,strlen($str)); $this->utf8.=$tmp; } } return $this->utf8; }
function U2UTF8($InStr) { for($i=0;$i<count($InStr);$i++) $str=""; if ($InStr < 0x80) { $str.=ord($InStr); } else if ($InStr < 0x800) { $str.=(0xC0 | $InStr>>6); $str.=(0x80 | $InStr & 0x3F); } else if ($InStr < 0x10000) { $str.=(0xE0 | $InStr>>12); $str.=(0x80 | $InStr>>6 & 0x3F); $str.=(0x80 | $InStr & 0x3F); } else if ($InStr < 0x200000) { $str.=(0xF0 | $InStr>>18); $str.=(0x80 | $InStr>>12 & 0x3F); $str.=(0x80 | $InStr>>6 & 0x3F); $str.=(0x80 | $InStr & 0x3F); } return $str; } }
测试文件如下:
php Header("Content-type: image/png"); $im = imagecreate(400,300); $black = ImageColorAllocate($im, 0,0,0); $white = ImageColorAllocate($im, 184,44,6); include("gb2utf8.php"); $obj=new gb2utf8(); $obj->gb="123abc中国456def测试正确"; $obj->Convert(); ImageTTFText($im, 20, 0, 5, 50, $white, "SIMKAI.TTF", $obj->utf8); ImagePNG($im); ImageDestroy($im);
说明: 需要正确设置font文件,请先确认可以使用font直接(不使用gb2utf8)输出英文。 gb2312.txt请在网上查找
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