当视频观看（文章阅读）次数超过1000时就转为1k

function num2tring($num) {
    if ($num >= 10000) {
        $num = round($num / 10000 * 100) / 100 .' W';
    } elseif($num >= 1000) {
        $num = round($num / 1000 * 100) / 100 . ' K';
    } else {
        $num = $num;
    }
    return $num;
}

echo num2tring(12300); //1.23 W
echo num2tring(1200); //1.2 K
echo num2tring(200); //200

function test($num){
    if($num < 1000) {
       return $num;
    } else if($num >=1000 && $num < 10000){
       return round($num/1000,1).'k';
    } else if ($num >= 10000) {
       return round($num/10000,2).'w';
    }
}
echo test(1320);