Variables?

[lentin64]

I'm wondering how you make a variable without the $

function mkvar($thevar,$value) {
// .. something ..
}
function delevar($thevar) {
// .. something else ..
}
mkvar("hello","something");
echo hello;

delevar(hello);

how do I do that?
-Steven

[roboteddy]

Steven,

You could use the eval() function. It evaluates a string as php code.

$code = $thevar . "=" . $value
eval($code);

however, there is no way to say 'echo(hello)'

Ted

[Anon]

You cannot make a variable without an $, but you can still work around it.

function make_var($var, $value)
{
global $$var;
$$var=$value;
}
function del_var($var)
{
unset($var);
}

To test it you do
make_var("hello", "something");
then
echo "$hello";
then
del_var($hello);

Di

[mega_hurtz]

//Di is correct
//two dollar signs with a variable that has a value makes the value a variable name.
//eg.
$var = "who"; //sets the variable to who
$$var = "me"; //now introduces the new variable 'who' and sets it to 'me'.

//I can now access the 'me' string by saying
echo "$who\n";

//or the accurate way, which basically says echo the variable variables assigned value.
echo "${$var}\n";

//Here's an object example of variable variables in an object.

class my_var {

  //constructor
  function obj_var() { }

  //assigns the given string as a variable name and returns it-- in order to preserve the variables outside of the function you have to use global declarations
  function mkvar($name,$val) {
  global $temp;
  $temp = $name;
  $$temp = $val;
  return $$temp;
  }

  //a fake me out function that returns a null value
  function delvar() {
  return "";
  }

}

global $temp;
$var = new my_var();
$$temp = $var->mkvar("say_hi","hello");
echo "$say_hi and ${$temp} are the same \n";
$$temp = $var->delvar();
echo "now the value of say_hi is ${$temp}";

[mega_hurtz]

//my bad...on the previous example I mucked up the constructor, but it still runs anyway

//Di is correct
//two dollar signs with a variable that has a value makes the value a variable name.
//eg.
$var = "who"; //sets the variable to who
$$var = "me"; //now introduces the new variable 'who' and sets it to 'me'.

//I can now access the 'me' string by saying
echo "$who\n";

//or the accurate way, which basically says echo the variables' assigned variable.
echo "${$var}\n";

//Here's an object example of variable variables in an object.

class my_var {

  //constructor
  function my_var() { }

  //assigns the given string as a variable name and returns it-- in order to preserve the variables outside of the function you have to use global declarations
  function mkvar($name,$val) {
  global $temp;
  $temp = $name;
  $$temp = $val;
  return $$temp;
  }

  //a fake me out function that returns a null value
  function delvar() {
  return "";
  }

}

global $temp;
$var = new my_var();
$$temp = $var->mkvar("say_hi","hello");
echo "$say_hi and ${$temp} are the same \n";
$$temp = $var->delvar();
echo "now the value of say_hi is ${$temp}";

[lentin64]

Working on define() .. Sorry!