RE: [PHP] $ vs $$

> I have seen places where $$ is used. When should I use $$ and what does it do. > > Thank you. > Dallas K. Well, you may know the simple way that PHP uses to go through arrays, specially through the HTTP-posted variables: while ( list ($name,$value) = each ($HTTP_POST_VARS) ) { (code) } You may know, every http-posted var has a name and a value. Well. That simple (but very often used) line of code goes throughall the posted variables; it assigns the name of the posted var to $name, and the value of the posted var to $value. Keep in mind that $name and $value are just temporary, and in the next loop they'll change. Well, if you use $value for calculations, and modify it, when the program finishes the *while* sentence, your modified values won't be seen *anywhere* as the $value variable wasn't linked with the "real" posted variables. But if you use $$name instead... You are saying: "the value of the variable named $name". If you modify that ($$name) instead of $value, the variable named $name will have its contents changed out of the *while* sentence.... I've been using that often with that damned http-posted variables. For example, for search and replace ( str_replace() ) the contents of every http-posted variables.