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<?php
$file=file_get_contents("common.js");
$lang=mb_detect_encoding($file,array("GB2312","UTF-8","ASCII","GBK"));
echo $lang."<br>";
var_dump($lang);
if(!$lang=="UTF-8"){
echo "not utf-8";
}
if($lang=="UTF-8"){
echo "utf-8";
}
?>
if(!(lang=="UTF-8")){
echo "not utf-8";
}
if(lang=="UTF-8"){
echo "utf-8";
}