BetterPHP

Hello all.

I have a tricky one.

I want to round my calculation result with 2.5

Example : 139.90 should become 140.00
Example : 136.01 should become 135.00
Example : 137.11 should become 137.50

In other words is hold round to the nearest in the 2.5 range. 2.5 - 5.00 - 7.50 - 10.00 - 12.50 - 15.00 132.50 - 135.00 - 137.50 - 140.00 any idea how to do that.

Best regards
Wizzuriz

PS. if you need to see more please let me know.

You can use round() to round a number.

echo round(139.90); // 140

but to round to the nearest .5 you will need to use some more maths.

echo round(139.9 * 2) / 2;

maybe ?

Hey Jacek.

Thanks for the fast replay, the thing is that I don't just need it to round it I need it to select the correct value.

its the result is 40.39 it should be 40.00 but if its 41.39 it should be 42.50.

<td id="tdgraa"><P>Step 0,2 <?php printf("%5.2f\n",$Display_step2);?></p></td> don´t round any but it will let me display the .00 and if I use <?php echo round($Display_step1 *2) /2;?> it rounds it to 41.50 and its should be 42.50 or 40.00 one or the other.

any idea?

Best regards
wizzuriz.

I don't really get how your rounding works. why should 41.39 wound up to 42.5 and not just 42 ?

jacek wrote:I don't really get how your rounding works. why should 41.39 wound up to 42.5 and not just 42 ?

He wants to round to the nearest multiple of 2.5.

Hello all.

I'm new in programming and I have a problem with rounding some values.

how could this work?

function round($my_number){

I don´t know how to put in xx value so i use * please let me know if there is a other way because the value cloud be 40.59 or 81.31 that i need to round in the same function.

If ($my_number =<*1.25);

     round floor(($my_number)/2.5)*2.5;
}
else if round celi(($my_number =>*1.26)/2.5*2.5; 
     
}

My results will be 40.00 to 200.00
The thing is what ever value I get from my calculation 40.00 , 42.50 , 45.00 , 47.50 or 50.00

My problem is if I use ceil(intval($my_number)/2.5)*2.5; is that if the result is 40.01 it will still round up.

Please let me know if you have a function, and if you cloud please show the echo round_function($my_number); så I know how to echo it on my page.

Thanks all.
Best regards
wizzuriz

Carbine wrote:

jacek wrote:I don't really get how your rounding works. why should 41.39 wound up to 42.5 and not just 42 ?

He wants to round to the nearest multiple of 2.5.

Well would

echo round($number * 4, 1) / 4;

do that ?

Thank for the help but it still is not the right value.

I get 48,75 its should be 47,50 or 50.00 not 47,75

round ($number* 4, 1) / 4

That don't work.


best regards
wizzuriz

Maybe replace 4 with 8

this can work, just meed to get the number right.

For some reason I have only looked at this topic at stupid times so can't be bothered to get paper to work it out.

Hi Jacek.

Can you please tell me the idea of the calculation, what is the different from 4,1/4 and 8,1 /8 ? it give the same still 48,75.

If I can understand the idea on how to make it I can calculate it myself.

A other ting is do you think you can help me build a function that can make my calculation more simple?

I think a while function cloud work with this.

My calculation is 90 different values but its a same formula and now i just have 90 lines with the same calculation where I just change the $specific_value for each calculation.

see this is my calculation

[syntax=php]
$result_x1 = $bcl109*pow($bcp_aa15_op1,$op2)*$value*$nk3*$oul87;
[/syntax]

I don't understand the concept on how to create / build a function yet but is reading on that part.

I'm working on something like this.
// this function should get $value from the database and return it as $value then it should take all the other values and return them and each time pass them to the calculation and return them all in a array where I can take them out.

[syntax=php]$result=array();

function calculation_multiple_times(){

$value = SELECT
"`value` FROM `calculations_values`
WHERE `user_name` = '{$user}'

mysql_query=$value;

Return =$value;

while = value = 1 : 0
$result = $bcl109*pow($bcp_aa15_op1,[b]$value[/b])*$uv1*$nk3*$oul87;
}[/syntax]

Now this don't work but I think there would be a way to calculate all values in the same function ??

Please let me know if you know how to build such a function or know where I can get information about it.

Best regards
Wizzuirz.

wizzuriz wrote:Can you please tell me the idea of the calculation, what is the different from 4,1/4 and 8,1 /8 ? it give the same still 48,75.

If you use 2 it rounds to the nearest 0.5

Take the example of 10.3

10.3 * 2 = 20.6
round(20.6) = 21
21 / 2 = 10.5

If we use 4 instead of 2

10.3 * 4 = 41.2
round(41.2) = 41
41 / 4 = 10.25

rounding to the nearest 0.25

So you want wounding to the nearest 2.5, so if we use 0.4

41.39 * 0.4 = 16.556
round(16.556) = 17
17 / 0.4 = 42.5

The formula to work out the number you multiply by is

1 / [what you want to round to] = number

In this case

1 / 2.5 = 0.4