Simple PHP calculation in postbit

[aceofspades]

Im trying to do a simple calculation in my postbit. Bascially it square roots a vb value and displays the answer to 1 significant figure.

For example if the value is 6 then the real answer would be 2.449... but it would display it as 2. I know pratically nothing about php, so all i have so far is this (which is probably wrong already):

<?php
echo sqrt($input);
?>

Can anyone help me on where i would go from here? It would be much appreciated.

James

EDIT:

Right im a little bit further on thanks to nick from vbnova. To get it to 0 decimal places ( i dont want to round the numbers up / down) ive got this code:

$number = 1.953434;
$number = str_split($number);

$number = $number[0];

But i really dont know how to put these two codes together. Can anyone help me out?

[Eikinskjaldi]

Originally Posted by aceofspades

Im trying to do a simple calculation in my postbit. Bascially it square roots a vb value and displays the answer to 1 significant figure.

For example if the value is 6 then the real answer would be 2.449... but it would display it as 2. I know pratically nothing about php, so all i have so far is this (which is probably wrong already):

<?php
echo sqrt($input);
?>

Can anyone help me on where i would go from here? It would be much appreciated.

James

EDIT:

Right im a little bit further on thanks to nick from vbnova. To get it to 0 decimal places ( i dont want to round the numbers up / down) ive got this code:

$number = 1.953434;
$number = str_split($number);

$number = $number[0];

But i really dont know how to put these two codes together. Can anyone help me out?

I think Nick is leading you astray, the above code will not work if the final value is more than 1 digit (e.g. sqrt 100). If you want to round down in all cases use floor.

$number = sqrt($input);
$number = floor($number);

[Paul M]

I don't really follow what you want, can you be more specific

i.e. what should be displayed for these examples ;

0.5
1.234
1.78
12.432
27.876
123.45
4567.89

[aceofspades]

Hi Paul, sorry if i didnt explain myself well. For the examples i would like the following displayed (if we are taking your examples as the result of the square root before they are put to 0 DP):

0.5 ----> 0
1.234 ----> 1
1.78 ----> 1
12.432 ----> 12
27.876 ----> 27
123.45 ----> 123
4567.89 ----> 4567

[Dismounted]

Create a plugin at the hook postbit_display_complete. Add this PHP code:

PHP Code:

$sqrt = floor(sqrt($input)); 


Now you can use $sqrt in your postbit(_legacy) template.

[King Kovifor]

Your PHP of:

sqrt($input); should return the float of the number; meaning I cannot see anything wrong with it.

If you read PHP's sqrt() page several members have offered alternatives if you would like to try them.