using varibales as a function name

[eluser]A.M.F[/eluser]
hello,

i am using a foreach loop to show several functions. so i want to do it something like this:

Code:

foreach($fields as $k=>$v)
{
     echo $this->validation->$v[0]._error;
}

but this is the message i get:

Message: Use of undefined constant _error - assumed '_error

why?

[eluser]A.M.F[/eluser]
nvm i used it like this:

Code:

$function_name = $v[0].'_error';
$this->validation->$function_name;

[eluser]Nick Husher[/eluser]

Code:

foreach($fields as $k=>$v) { echo $this->validation->$v[0]._error; }

It's because you didn't put quotes around error in the first example: $this->validation->$v[0].'_error'

[eluser]tonanbarbarian[/eluser]
actually im not sure the quotes would work

Code:

echo $this->validation->{$v[0]._error};

this should work, although I personally use the method AMF showed more often than not despite it meaning more code to run