PHP5.5 New features

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Class name resolution via ::class ¶

It is possible to use ClassName::class to get a fully qualified name of class ClassName. For example:

<?phpnamespace Name\Space;class ClassName {}echo ClassName::class;echo "\n";?>

The above example will output:

Name\Space\ClassName

转自 http://php.net/manual/en/migration55.new-features.php

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