UTF-8编码的文件分为带Bom和不带Bom两种，带Bom的大家都很容易处理，不带Bom的会有点麻烦，所以写了一个函数去判断，代码如下：
//返回 1 表示纯 ASCII(即是所有字符都不大于127)
//返回 2 表示UTF8
//返回 0 表示正常gb编码
function TestUtf8($text)
{
if(strlen($text) < 3) return false;
$lastch = 0;
$begin = 0;
$BOM = true;
$BOMchs = array(0xEF, 0xBB, 0xBF);
$good = 0;
$bad = 0;
$notAscii = 0;
for($i=0; $i < strlen($text); $i++)
{
$ch = ord($text[$i]);
if($begin < 3)
{
$BOM = ($BOMchs[$begin]==$ch);
$begin += 1;
continue;
}
if($begin==4 && $BOM) break;
if($ch >= 0x80 ) $notAscii++;
if( ($ch&0xC0) == 0x80 )
{
if( ($lastch&0xC0) == 0xC0 )
{
$good += 1;
}
else if( ($lastch&0x80) == 0 )
{
$bad += 1;
}
}
else if( ($lastch&0xC0) == 0xC0 )
{
$bad += 1;
}
$lastch = $ch;
}
if($begin == 4 && $BOM)
{
return 2;
}
else if($notAscii==0)
{
return 1;
}
else if ($good >= $bad )
{
return 2;
}
else
{
return 0;
}
}
波比源码 » 用PHP判断文件是否是UTF-8编码(检查Bom)
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