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Some feature usage of PHP7

The usage of 1.use

two。 New filtering function of sequence number function unserialize

/ / convert object to _ _ PHP_Incomplete_Class object $data = unserialize ($foo, ["allowed_classes" = > false]); / / convert object to _ _ PHP_Incomplete_Class object, except for MyClass and MyClass2 $data = unserialize ($foo, ["allowed_classes" = > ["MyClass", "MyClass2"]); / / accept all classes $data = unserialize ($foo, ["allowed_classes" = > true]) by default

3. Define an array of constants through define

4. Ternary operator null merge

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