PHP Problems with constructing classes (variables and namespaces)

Question

I just got stuck with the following problem. I'm trying to construct a class but it isn't working. When I'm constructing the class it uses namespaces and variables, because the variable has to be put behind a backslash (for the namespace) it gives an error. Here's an example code of defining the class;

$className = 'Help';
$controller = new \controller\$className;

The class name is defined in a variable, in the example code above I've just set it to 'Help'. When constructing the class it has \controller\ in front of it, that's cause it's in that namespace. If I remove the namespace thing away so it just has;

$controller = new $className;

it does work. The problem is probably caused because there's a backslash in front of the variable which contains the class name to construct. I am not able to add use controller; in the beginning of the code because the file containing the class is loaded inside the constructor, and the class is immediately constructed after the file has been loaded. The use function could only be used in the beginning of your file, not inside a method, I think.

I hope someone could help me out,.

Thanks in advance, Tim Visée

leftclickben · Accepted Answer · 2013-02-05 19:11:45Z

3

Your first example is invalid syntax. You would need instead something like:

$className = '\controller\Help';
$controller = new $className();

answered Feb 5, 2013 at 19:11

leftclickben

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Jon · Accepted Answer · 2013-02-05 19:12:02Z

3

Set the fully qualified class name to a variable and use that to instantiate a new object:

$className = '\controller\Help';
$controller = new $className;

answered Feb 5, 2013 at 19:12

Jon

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