PHP Scope question

[ctrlaltdel]

I am trying to accomplish something, as described below but am failing miserably. Any help to get something like this or very similar to work would be greatly appreciated.

I have tried both ways to call globals( global $var, and $GLOBALS[var]) neither work.

example

$foo = "This is a $bar sentance.";

function fooBar(){

global $foo;
$bar = "great";
print $foo;
}

Output:
This is a sentance.

[ingoruberg]

Your idea is good, but it wont work, because
$foo is a string and can not contain any variables, but you can declare a string (%var%) and replace it wit any other string.
Look at the following example.

<?
$foo = "This is a %var% sentance.";

function fooBar(){
global $foo;
$bar = "great";
$foo = str_replace ("%var%", $bar, $foo);
print $foo;
}

fooBar();
?>

[ctrlaltdel]

thanks, i'll try that.
is there a faster way to replace the variables if i had more then one?