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$text = "啊啊啊啊";
echo mb_strlen($text,'utf8')."<br/>";
echo mb_strlen($text,'gbk')."<br/>";
echo mb_strlen($text,'gb2312')."<br/>";
echo strlen($text);
$text = "啊啊啊啊";
echo mb_strlen($text,'utf8')."<br/>";
echo mb_strlen($text,'gbk')."<br/>";
echo mb_strlen($text,'gb2312')."<br/>";
echo strlen($text);