Core Idea of PHP implementing chain operations

Core Idea of PHP implementing chain operations

This article mainly introduces the core idea of PHP implementing chain operations. This article focuses on its core idea, which is more intuitive and clear. For more information, see

Implementation of PHP chained operations

The Code is as follows:

$ Db-> where ()-> limit ()-> order ();

Create Database. php under Common.

The core of a chain operation is: return $ this at the end of the method;

Database. php:

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<? Php Namespace Common;   Class Database { Function where ($ where ){ Return $ this; // the core of the chained method is: return $ this after each method } Function order ($ order ){ Return $ this; } Function limit ($ limit ){ Return $ this; } }

Index. php:

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<? Php Define ('basedir' ,__ DIR _); // defines the root directory constant Include BASEDIR. '/Common/Loader. php '; Spl_autoload_register ('\ Common \ Loader: autoload ');   $ Db = new \ Common \ Database ();   // Traditional operations require multi-line code implementation // $ Db-> where ('Id = 1 '); // $ Db-> where ('name = 2 '); // $ Db-> order ('Id desc '); // $ Db-> limit (10 );   // Use a chain operation and a line of code to solve the problem $ Db-> where ('Id = 1')-> where ('name = 2')-> order ('Id desc')-> limit (10 );

When using the chain operation, ide (netbeans will automatically prompt ):