从存储在变量中的类访问静态变量

Question

Given a class:

class SomeClass{
     static $information = 'useful information';
}

I a trying to access a static variable in a set of php classes. Each class has the $information static variable. If I access the static variable directly

echo SomeClass::$information;

The program outputs the information, however if I try to access it storing it in a variable I get a error that the '::' is unexpected.

$class = SomeClass;
echo $class::$information;

The reason for storing the class in a variable is so that I can have a function that can create an array of Users or an array of Projects for example.

Answer 1

class SomeClass {
  public static $information = 'useful information';

  public static function getInformation() {
    return self::$information;
  }
} 

Then you can do the following:

# Static Access
echo SomeClass::$information;
echo SomeClass::getInformation();

# Static Access via Class Name in Variable
$someClass = 'SomeClass';
echo $someClass::$information;

## Instantiated access
$someClass = new SomeClass();
echo $someClass->$information;
echo $someClass->getInformation();