How do I spell string into array ?

hello everyone,

i'm trying to make something for fun, but to accomplish this i need to remove parts of strings recorded into variables.

so the best way i think, is to get this string, wich can be anything, spelled letter by letter into an array wich can be manipullated easilly after.

so how can i have a "foreach letter" from string function ?

thanks for your quick answer,

i fund another to do it without array, by using left and right parameters that I didn't know.