如何保留小數點後1位數，並且四捨五入

Question

formatnumber(number,1, , , 0)

Answer 1

php怎麼表現，我這樣寫不出來echo formatnumber(124.75,1, , , 0)

Answer 2

<?
$short_pi = "3.14159";
$my_pi = number_format($short_pi, 2);
echo $my_pi."\n";   // 3.14
$foo = 850017.9021;
$new_foo = number_format($foo, 3, ".", " ");
echo $new_foo."\n";  // 850 017.902
?>

Answer 3

不好意思，搞成ASP的了PHP里面是这样的：round(13243.2343,1)