ints and operators

phpscripters

say i had this:

$string = "5+8*10";
$intarray = array ();
$oparray = array ();

i want to know how you would go through the string and add any number and like in whole form in to the $intarray and any operator in the $oparray... so after its done the arrays would be like

$intarray = array(5, 8, 10);
and
$oparray = array("+", "*");

i figure it would be done with regex but i have absolutely no idea how, any basic help would be great.

This is extra, but if you know that would be great as well.

if the string was like "5 + 08 * 010" i would like to know how to make it get rid of the extra spaces and leading zeros

rehfeld

it can be done without too much effort, but i have a feeling you may be a better way of doing whatever it is your trying to do.

could you explain why you want to do this?

phpscripters

i am trying to make a program that gets a mathematical expression and reduces it one step at a time... and shows each step as it goes. like the next step would be "5+80"

should follow order of operations

kburger

Untested:

$intarray = preg_split("/[\\+\\-\\*\\/]/", $string);
$oparray = preg_split("/[0-9]+/", $string);

I just realized that $oparray will contain null values for the first and last elements.

davidjam

Originally posted by phpscripters
.. i figure it would be done with regex but i have absolutely no idea how..

I think with regex it's better to know how then just copy and paste someone elses expression. It's unlikely that what they provide will be exactly what you need as your application evolves.

I'm a newby and I got started on regex from this excellent tutorial: Learning to Use Regular Expressions by Example. Go ahead, impress yourself! 🙂