Introduction to the use of class-level constants in php5.5 _php tutorial

PHP recently released the first stable version of 5.5, introduced a class-level constant, the name is ' class ', the constant is valid for all classes, returns the full name of the class.

Copy the Code code as follows:
namespace Vendorpackage;
Class Foo
{
// ...
}
Var_dump (Foo::class);
The above script outputs a string of "Vendorpackagefoo".

Why do you want to use it

Why do we use a constant like this, not just the full name of the class, as in the example above. We can also achieve the same effect using __namespace__, and php5.3 can be used:

Copy the Code code as follows:
namespace Vendorpackage;
Class Foo
{
// ...
}
Var_dump (__namespace__. ' Foo ');

However, when you need to fully qualify the name, the namespace references the class namespace alias ... Then it becomes interesting.

In the following example:

Copy the Code code as follows:
Use Vendorpackagefoo;
Class Footest extends Phpunit_framework_testcase
{
Public Function testbarcanbeprocessed ()
{
$bar = $this->getmock (' Vendorpackagebar ');
$foo = new Foo;
$foo->process ($bar);
// ...
}
}

Copy the Code code as follows:
Use Vendorpackagefoo;
Use Vendorpackagebar;
Class Footest extends Phpunit_framework_testcase
{
Public Function testbarcanbeprocessed ()
{
$bar = $this->getmock (bar::class);
$foo = new Foo;
$foo->process ($bar);
// ...
}
}

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