[PHP] Variables and Strings

[PHP Superman]

Hey everyone, is there a way to return all the variables from a string into
an array, for example
$Var1="Yo";
$Var2="Man";
$SQL="SELECT * FROM tblname WHERE 4=$Var1 AND WHERE 3=$Var2";
$AllVars=MySpecialFunction($SQL);
print_r($AllVars);

would ideally print an array like:
{
array
$Var1="Yo"
$Var2="Man"

}
i think i should use an ereg or preg replace but I don't know much about
them or how to use them, thanks in advance