Quickie Query

[dagnasty]

Is it quicker to place a decimal in a number with string manipulation rather than divided by a certain number and round?

[Orio]

I cant understand you... Can you give an example maybe?

Orio.

[gmwebs]

I would say do the math and then use the round() function.

[code]
<?php

$x = 5/3.5;

echo round($x, 2);  // 1.43

?>
[/code]

[dagnasty]

What if my number is 546000 would it be quicker to divide by 1000 or to insert decimal where I know it goes with string manipulation?

[craygo]

if you want to keep it as a number you should divide it. Numbers are always faster to minipulate than strings.

Ray

[dagnasty]

The reason I'm asking is because it will be done about 200 times in my script and they are large numbers.

[craygo]

200 times is nothing for a script. I wrote this quick looping 500 times and it returned in less than a second
[code]<?php
<?
for($i=20000; $i<=20500; $i++){
$newnumber = ($i / 10.6);
echo round($newnumber, 2)."<br>";
}
?>[/code]

So I would say stay with the number formulas

Ray

[gmwebs]

What about using number_format()?

[code]
<?php

$val = "54600000";
echo number_format($val, 0, "", ","); // returns 54,600,000

?>
[/code]

[dagnasty]

because it deals with filse size.

ex.
23.42 MB
3.1 GB
32.34 KB 

[Orio]

Make a test-
make file a.php which uses the math operations and in the begining write- $start=microtime(). In the end write echo ((microtime()-$start)).
Then make file b.php which uses round() or whatever, in the beging write $start=microtime() and in the end write echo ((microtime()-$start)). See if there is a real diffrence between the number of seconds that a.php took compared to b.php.

Orio.