Question

How to round a float to a specific number of decimal places after the point in PHP

Answer 1

function round_pos($n, $pos=0) {
    $pw = pow(10, $pos);
    return ($n >= 0 ? ceil($n * $pw):floor($n * $pw)) / $pw;
}

echo round_pos(12.6789001, 2) . "<br />";
echo round_pos(17.9810001, 2) ."<br />";
echo round_pos(3.14159265359, 4) . "<br />";
echo round_pos(3.14159265359, 6) . "<br />";
echo round_pos(0.9871, 4) . "<br/>";
echo round_pos(-0.9871, 4) . "<br/>";
echo round_pos(0.000011113, 2);



/*
run:

12.68
17.99
3.1416
3.141593
0.9871
-0.9871
0.01

*/

 

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Answer 2

function round_pos($n, $pos=0) {
    $pw = pow(10, $pos);
    return ($n >= 0 ? ceil($n * $pw):floor($n * $pw)) / $pw;
}

echo round(12.6789001, 2) . "<br />";
echo round(17.9810001, 2) ."<br />";
echo round(3.14159265359, 4) . "<br />";
echo round(3.14159265359, 6) . "<br />";
echo round(0.9871, 4) . "<br/>";
echo round(-0.9871, 4) . "<br/>";
echo round(0.000011113, 2);



/*
run:

12.68
17.98
3.1416
3.141593
0.9871
-0.9871
0

*/

 

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