| Re: How to create an instance from a class name [message #177814 is a reply to message #177809] |
Sun, 22 April 2012 09:19   |
M. Strobel
Messages: 386
Registered: December 2011
Karma:
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Senior Member |
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Am 22.04.2012 03:23, schrieb Leonardo Azpurua:
> Hi,
>
> I am working on a class to generate a report from specs contained in a user
> defined file.
>
> A section on the file defines a form in which the user will input parameters
> for the report. This form may contain different kinds of INPUT items, namely
> FECHA (date), NUMERO (number), TEXT, SELECT, LISTA (select with multiple
> options) or CODIGO (an items code, with the ability to search by
> name/description). Each item is defieed in a class that knows how to parse
> the definitions and generate the corresponding HTML/Script code.
>
> Each class name is made of a preffix ("procesador") plus the type of item
> (e.g. "procesadorFECHA").
>
> Initially I used a switch statement in order to build each class:
>
> switch ($token->value)
> {
> case "TEXT":
> $proc = new procesadorTEXT();
> break;
> case "NUMBER":
> $proc = new procesadorNUMERO();
> break;
> ...
> default:
> die("Invalid INPUT type ...");
> }
> $proc->go($tokens, $lineNumber, $this->context);
>
> I recall having read somewhere an example of PHP instantiatiting an object
> from a class name, but I forgot both the workings and the source of the
> example. I made a few attempts with ReflectionClass, but I couldn't find a
> solution, so this is what I did:
>
> $className = "procesador" . $token->value;
> $newFunc = create_function("", "return new " . $className . "();");
> $proc = $newFunc();
> $proc->go($tokens, $lineNumber, $this->laEmpresa);
> unset($newFunc);
>
> It works, but I would like to know whether it will produce any unexpected
> behaviour when the component enters in production, and if there is a better
> (cleaner) way to do it.
>
> Thanks.
>
> --
Just take the classname as variable in the new Operator:
class clase1 {
function buenos() {
echo "Bon día!\n";
}
}
class clase2 {
function buenos() {
echo "Buenos días!\n";
}
}
foreach (array(1,2) as $v) {
$cn = 'clase' . $v;
$c = new $cn();
$c->buenos();
}
#--------------------
Bon día!
Buenos días!
/Str.
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