New features of php7: scalar type declaration

PHP7 has added the feature of scalar type declaration. There are two modes for scalar type declaration:

• Forced mode (default)

• strict Model
  
  

1. Syntax format:

declare( strict_types=1 );//代码中通过制定 strict_types 的值（ 1 或者 0 ）

• # 1 means strict type verification mode , applied to function calls and return statements;

• 0 indicates weak type checking mode.

2. Usage

declare(strict_types=1) to set whether to enable strict matching mode. After it is enabled , if the parameter passed in is not a preset parameter type, an error will be reported, for example:

        

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declare(strict_types=0) to set whether to enable the forced mode. After it is enabled, if If the parameter entered is not a preset parameter type, no error will be reported, for example:

        

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3. Available types

• int

• float

• bool

• string

##nterfaces

• ##array

• callable

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