What is the difference between php instance methods

The differences between php instance methods are: 1. Static methods do not require new, while instance methods require new; 2. Non-static properties cannot be called in static methods; 3. Static methods have only one copy in memory, and Resources are shared within a PHP life cycle, and instance methods may have multiple copies in memory.

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The difference between php static methods and instance methods

In PHP object-oriented programming, we often come into contact with classes and methods. What is the difference between static methods and instance methods (non-static methods)? How to choose and apply more appropriately? Please see the comparison below:

##StorageOnly in memory One copy, within a PHP life cycle, resources are shared. Every new time, an independent space will be opened, that is, there will be multiple copies in the memory. PerformanceDirect call, no need to open space and other operations, better in terms of time and efficiencyIt takes some time to open space, etc. OperationSharingSharing the same space and the same data, so in some scenarios it is more suitable to use static methodsMultiple instances are not shared Same space and dataChain writing method is not supported

Difference point	Static method (static)	Instance method
Calling	does not require new, class name::method name. For example: 1User::find(); Note: Non-static properties cannot be called in static methods.	Requires new. For example: 12$userObj = new User;$userObj->find();
	Note: Static methods and properties are loaded as the class is loaded, so too many static methods will consume more memory.
		is supported. For example: 1$userObj->fields('uid')->where('uid>0')->find();

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