php5.5 class-level constants usage Instructions _php Tutorial

Learned a bit yesterday php5.5 found a new function is class-level constants, let me give you a simple share of my study notes.

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.

The code is as follows	Copy Code
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:

The code is as follows	Copy Code
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:

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

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

http://www.bkjia.com/PHPjc/628622.html www.bkjia.com true http://www.bkjia.com/PHPjc/628622.html techarticle learned a bit yesterday php5.5 found a new function is class-level constants, let me give you a simple share of my study notes. Not long ago PHP just released the first stable of 5.5 ...

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