Math problems

[Vmi90]

Ok, i want to take a variable, and add/subtract it to a constant number.

The variable has commas in it, is there a way to take them out?

Also, whats the code to add/subtract the variable to a constant?

[kenrbnsn]

You remove the commas with the [url=http://www.php.net/str_replace]str_replace()[/url] function.

You can't add/subtract a variable from a constant, since then it wouldn't be a constant anymore. You can add/subtract a variable from a constant and store the results in another variable.

If I were you, I would read the [url=http://www.php.net/manual/en/langref.php]Language Reference[/url] section of the manual. This should help answer your questions.

Ken

[.josh]

you are going to have to be more specific. 

$blah = "1,2,3";

is that what you have?

you can explode at the commas, creating an array with 3 seperate variables..but then what? are you wanting to add 1 2 and 3 together? add them to your constant, seperately?

[Vmi90]

lets say the variable is 1,200.  I want to take away the , so it says 1200.

then i wanted to add 100 to that variable would it be

$newvar = ($oldvar + 100) ?

[kenrbnsn]

Like I said earlier, use the str_replace() function to remove the commas:
[code]<?php
$var = "1,200";
$newvar = str_replace(',','',$var) + 100;
echo $var . ' ... ' . $newvar;
?>[/code]

Ken