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+--- Thread: $function() ? (/showthread.php?tid=11242)
$function() ? - El Forum - 09-01-2008
[eluser]Boyz26[/eluser]
Hi everyone,
Is there any way I can convert a string variable to a function?
I am storing a series of actions in the database that will be called later.
Code:
function recipe($id) {
$this->db->where('recipe_id', $id);
$query = $this->db->get('actions');
foreach($query->result() as $row):
//my question: can I do any of these?
$actionName = $row->actionName;
$this->$actionName();
//or..
convertToFunction($actionName);
//or..
if($actionName == 'fryAnEgg') { $this->fryAnEgg() }
elseif($actionName== 'bakeCookie') { $this->bakeCookie() }
//and so on..
endforeach;
}
function fryAnEgg() {
//complex function
}
function bakeCookie() {
//another function
}I will be having many many actions, so I don't want to make a long elseif list..
Thank you!!
$function() ? - El Forum - 09-01-2008
[eluser]Colin Williams[/eluser]
You can $this->$method or call_user_func(array($this, $method)), but it's a good idea to run a function_exists or method_exists test before you call it. For security reasons, you might also want to use an array to store valid methods.
$function() ? - El Forum - 09-01-2008
[eluser]Boyz26[/eluser]
Thank you!
For $this->$method, does $method need to be 'method()' or just 'method'?
Would you mind explaining more about security with using an array to store valid methods?
$function() ? - El Forum - 09-01-2008
[eluser]Colin Williams[/eluser]
It needs to be like 'method' and you actually do $this->$method(). Sorry I wasn't clear about that.
Here's an example of securing methods that can be called with an array.
Code:
class Example extends Model {
var $allowed_actions;
function Example()
{
$this->allowed_actions = array('bake', 'frost', 'eat');
}
function recipe()
{
// Get the recipe action somehow and store it in $action...
if (in_array($action, $this->allowed_actions) and method_exists($this, $action))
{
$this->$action();
}
else
{
show_error('Action does not exist or is not allowed');
}
}
function bake()
{
}
[...]
}$function() ? - El Forum - 09-01-2008
[eluser]Boyz26[/eluser]
Thank you so much! You are of much help!