Yii2 PHP Namespace introduction of third-party non-namespace library files, error: Class not found resolution
Namespace Library mode for a class file
The class is introduced in the following way, with the error class not Found:
namespace
[Finally understand] the benefits of adding PHP to a namespace-facilitate automatic loading and finally understand the namespace
A PHP project usually has only one entry file index. php. We usually write an automatic loading function in this entry
The previous article introduced some terms of the PHP namespace and Its parsing rules. In this article, we will continue to describe the PHP namespace dynamic access and usage skills, hoping to help
The previous article introduced some terms of the
The XML namespace provides a way to avoid element naming conflicts.Name Conflict
Because the elements used in the XML document are not fixed, two different XML documents may use the same name to describe different types of elements. In this case,
Class scope and namespace continuation
(Name Search rules)
In version 4, there is a paragraph about the Name Lookup in the class scope:
So far, in our program,Name Search (the process of searching for declarations that match the given name)Is
Namespace declaration:
UseNamespaceA keyword is used to declare a namespace. The namespace declaration cannot contain any access modifiers. Declaring a namespace can help control the range of class names and method names to prevent name
In layman's terms, the so-called namespace in Python can be understood as a container. Many identifiers can be installed in this container. Identifiers that have the same name in different containers do not conflict with each other. Understanding
Before reading this article, I never knew that the original bind can also have a namespace. In fact, after reading this article, I flipped through the manual and found a little comment. However, the manual is just a single sentence. Without too much
Before describing the name resolution rules, let's take a look at some important definitions:
Name resolution rules
Before describing the name resolution rules, let's take a look at some important definitions:
Namespace name definition
Unqualified
The role of the namespace. The following content is reprinted. You can see the problem: the element name of XML is not fixed, when two different documents use the same name to describe two different types of elements, or use the same tag to indicate
In PHP, a function with the same name or a class with the same name is not allowed. For
prevents programmers from repeating conflicting class names or function names defined in the project, the concept of namespaces was introduced in PHP5.3.
1.
Php namespace namespace
The official statement is:
In PHP, namespaces are used to solve two types of problems when creating reusable code such as classes or functions when writing a class library or application
1. User-written code conflicts
I now feel that C # is to know the basic syntax of C #, the new features of C #, and what can C # Do!I feel that namespace is critical in any case. It can be said that it is not only for C #, but for the whole. Net is composed of namespaces, so
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Translate namespaces into namespaces. What is the role of a namespace? When we use another person's or multiple DTD files in an XML document, the
--------------------------------------------------------------------------------------------------One. PHP namespaces primarily address three conflicting issues: constants, functions, classesPopular understanding: namespace is equivalent to building
With this namespace concept, a virtual system can be implemented on Linux.What do you mean? With the Clone () system call, plus a certain flag, you can place a process process_a in another namespace Ns_b that is different from the current namespace
This example describes the usage of the PHP namespace. I would like to share it with you for your reference. the namespace (namespace) is equivalent to functions and classes and is divided into a region, so that the same page can have the same
In a managed C ++ project, we can use the "Using namespace" expression to include managed types. just like using "# include" incorrectly will cause some compile error, declaring "Using namespace" globally will cause some problems too. we encountered
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