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PHP Hosting
PHP is used primarily as a scripting language on the server side, which means that it is the server (the machine that hosts the Web page in question) who will interpret the PHP code and generate code (consisting generally of ‘XHTML or HTML, CSS, JavaScript and sometimes) which may be interpreted by a browser. PHP can also generate other formats in connection with the Web, like WML, SVG, PDF, or bitmap images such as JPEG, GIF or PNG.It was designed to allow the creation of dynamic applications, mostly devoted to the Web. PHP is mainly installed on an Apache server, but can be installed on other major HTTP server market, such as IIS.Further php web hosting is cheaper than any other web servers.This coupling allows to retrieve information from a database, a file system (and files inside the tree) or simply data sent by the browser to be read or stored for use Later.It is a typed language and little flexible and thus easy to learn for a beginner, but this fact, security vulnerabilities may soon appear in applications. Pragmatic, PHP is not encumbered by theory and tends to choose the most direct path. However, the function names (and argument passing) do not always follow a consistent logic, which may be detrimental to learning.
uml for web site development
Whether you are starting from scratch Construction sites, web site or transplanted to a significant increase in function, in order to ensure optimal design decisions, carry out some pre-planning is necessary. If you and others to complete a project collaboration, and distribution of the total work to reach a clear consensus on the role of inestimable. During the plan period, you should make an effort on the system the following aspects of the formation of a correct understanding of: Understanding of the users using the system is very important. Analysis not only ask you to get in touch with the user (through a questionnaire survey, email, or face-to-face conversation), and you often have to allow the system to control the different user roles and permissions. Classification of users and understand their needs, you can find clues to determine the database's security mechanisms, methods of functional limitations, user interface division, training and assistance needs of the specific content of the demand, they can even learn from the side to the distribution of potential advertisers. The figure shows several different sets of users (in the UML as the Actor, that is, participants). Here, the most common type of user ( "Site User") is located in the top graph, solid line arrows indicate the relationship between generalization ( "generalization" relationship, see Appendix note of this article, the same below), which indicated that specific Site User also can be divided into two types of users: Guest, Registered User. There are two types of characteristics of users in the "Site User" participants described, and the Guest and Registered User respective characteristics of private participants in the corresponding note. Usually, you can directly add documentation for the participants, without a separate document prepared by the user, but you used UML tools. In this case, Registered User can be broken down into the Wireless User and Administrator both types, the system for the treatment of these users should be different. Officially began in before writing code, you should be prepared to construct a kind of system to have a clear understanding. While at the same time in the preparation of the code can also be done gradually, and this is also very attractive, but with graphics and text information in advance to discuss the collective efficiency is much higher. Site preparation for a detailed description of the demand is often less cost-effective, but you should have time to draw a few sketches, notes to write paragraphs that the services provided by the Web site was prepared. This use to Use Case diagram (use case diagram). Use Case can be seen as a set of functions - it may be a corresponding page on the site, one must be prepared, or site of an action may occur (for example, to verify the user login and change the user's configuration file, removing expired accounts, etc.). The following is a web site can help you planning the Use Case diagram. Note that the map does not show all the site's Use Case, usually more than we need in order to describe the Use Case diagram of the site features complete. Even in such a simple Use Case diagram, we can easily express a wealth of information. For example, include the relationship between the two Use Case contains the same authentication function; extend the relationship that the weather likely to WML page or HTML format; generalization relationship between the performance of each specific process will comply with the "Render HTML Page" or "Render WML Page" described the basic rules of conduct in order to achieve the effect of maintaining a unified style and unity of purpose of the macro patterns of behavior. The figure also shows that wireless users can access the site's other users can not access certain areas. In this Use Case diagram, only wireless users to access traffic reports. This is because we have learned that only the movement of road traffic flow statements for the needs of users, and do not want to spend time on the traffic flow statements into other markup language forms. Thus, "Get Traffic Report" Use Case is divided into WML and HTML do not need to show two forms, it can be directly included in "Render WML Traffic Report" The Use Case. Use Case in the production process, you will get some indication of what site the user interface of the clues. Perhaps you have long pages with some wonderful design ideas, but the Use Case to help us from another point of view. Is it really necessary for the user interface so much? Whether or not a page is too complicated? Web site easy to use navigation facilities, that is commonly used from the home visit service is very convenient? Interface in the draft outline, the production of a prototype Web site, you should be in the Use Case diagram to solve these problems. The plan also shows the parameters passed between pages. regionId is a very important parameter, which represents the user's region of interest (which may be a country, city or province). regionId transmission in the region between pages of information, allows users to designated areas from weather to traffic information Jump statements. As for common area site, you can see is the pointer to the entire package (package) rather than a single file in the region, which is a simplified method to reduce the confusion because all other packages must be used in most (if not all) / common / region document. For small sites, select the tools and techniques is quite simple. In particular the reasons for the investment, only a few tools have practical significance only - Apache, MySQL or PostgreSQL, PHP, Perl or JSP / Servlet. The most popular is a combination of Apache + PHP + MySQL, there are many low-priced Web hosting services to support and mainly concentrated in the combination of this tool. For larger sites, application software in terms of investment, it must be a variety of tools for a more rigorous assessment and testing. Here is an example of component plans, which can be used to describe the architecture of the site. The graphics are simple, but it has been described in the majority of the current site architecture, website for you to re-create the plan may also not necessary, because there is no longer worthy of adding different contents of the graphics. Discussed throughout the life cycle of software have been beyond the scope of this article, but it should be noted that the establishment of the application of the prototype model and the interface should be started at this time. Be sure to write down the website page structure and layout of some of the ideas, because in the end you will want to layout (menus, navigation bar, the overall page layout, etc.) to prepare some common code. In addition, if you are transferred to the new tools and technologies, the establishment of the working prototype that allows you to ensure the feasibility of the design, are confident that we have on the use of new tools for development team members sufficient training. The design phase should overlap with the analysis phase. Once the structure of their system to have more awareness, you should begin to develop design ideas. First analysis of one hundred percent re-enter the design phase of system is meaningless. Always needs to develop, and sometimes the design itself needs to promote the development (or vice versa). All the developers are carrying out some type of design - just some of the development of programming code directly to the design of the form. Although this task can be completed, but it makes managing complex projects and working groups in the distribution of the very difficult task. Spend some time before the adoption of structural system model design, since you will receive an enormous return. Many developers spend debugging and rewriting code for longer than the time of writing code, if more than one building site look at the issue, the situation is especially serious. Good website design to the structure, organization and the form of code reuse is applied to a number of websites. However, if the code is just a pile of hastily formed, from the existing long-term benefits of code is reduced. Web site design to planning, a very effective way is to draw class diagram (Class Diagram). The chart below shows the class diagram are used in many important relationships. Renderer is an abstract class (shown in italics). This means that the Renderer can not directly use category, the program can only create instances of its subclasses (ie, new Region ()). In order to meet the contents of the page shows the different types of needs of the browser, all used to generate page content must be derived from the type of Renderer. Method name ("+") plus sign in front that it is the common method, can be other objects or function calls; minus sign ("-") that method or variable is private, only members of the same object within the function visit. In the methods and variables in PHP is public, but we should always as a private variable to avoid direct access from outside the object variable. Each class diagram should be marked with a category: All methods (as well as all the variables, if any), methods of access to property (public, private or protected), the return value of the type of approach, methods, parameters, variables of type . EDITORIAL function, if the class variable, then the general then in a separate list box. Even if you are not a structural object-oriented system, you are still on the class diagram can be used to establish a model system. Category to describe the ability to easily include a variety of relationships and you have a function of the preparation of documents. Although class diagrams are no longer at this time showed that inheritance, composition / aggregation, such as specific object-oriented system, but it can be used to describe the dependence of the call relations between documents. In some cases, we need to show how the application of the various components of collaboration in the run-time task. In front of the class diagram shows the relationship between categories, but it does not show the order of call there and did not show the results from a function may decide to call the next target. In order to better describe the level of dynamic systems, UML provides a number of other types of plans. For Web site design, plot plan (Scenario Diagram) particularly useful. Plot plan is divided into two categories: collaboration diagram (Collaboration Diagram), sequence diagrams (Sequence Diagram). In general, we do not establish a system for all interactive process models, plot plans only system used to describe some of the most complex, or the code used to summarize the general call patterns. For example, we may have to model how a specific page of code to authenticate a user collaboration, or to show how to call the common code page (tools of the framework of the code) in order to maintain a unified look and feel. Collaboration diagram above shows the weather from the Web site to obtain statements of the general process. Attention to the plan ignored a number of important ways, because we only deal with the key steps in the process of interest. You can code "1" to "1.3.3.4" to identify the implementation of the order of the various functions. Some people prefer to "1,2,3, ... ..." No form of steps, but generally speaking, with "1,1.1,1.2,2,2.1, ... ..." shows the form of the depth of call stack is a kinds of better options, such a symbol indicates more clearly the way to show that the conversion process control procedures. For example, the map shows that report () method call, as well as a Region object WMLUtil in many ways: through a series of inquiries and content generating function to generate statements for the designated areas, we call the WMLUtil in buildHeader (...) function; Finally, we call that WMLUtil module buildFooter (...), and then return to report () method, and finally return getPage (). Collaboration diagrams you can add more details, such as the return value, restrictions, conditions. On the graphic message, the sequence diagram and collaboration diagrams are very similar. In fact, many modeling tools UML collaboration diagrams generated from the sequence diagram, or vice versa. Sequence diagram and collaboration diagrams of the main difference is: In order map, order of events at a glance, very intuitive. In addition, the sequence diagram can also join the life cycle and time detailed information, such as delay, concurrent thread, and delete objects such as structures. If you want to show the code with the time or is closely related to the issue of threads, select the order of Fig. If you want to show the interaction between object model, select the collaboration diagrams. If you want to display a few or a large number of interactions between objects, select the order of Fig. If you want to show a lot between a small number of objects or interactive messaging process, select the collaboration diagrams. As this article in front of "tools options" section mentioned, the majority of Web site architecture is not complicated. Nevertheless, the deployment diagram (Deployment Diagram) in two aspects is still very useful: site structure, file organization. The document organization, planning ahead to discuss the interface has already been mentioned it can also be used for planning modeling tools category. The following components are given a simple map for reference, according to site needs and the complexity of the different, you may not need it. "Raise the kind of cohesion and reduce the link between different types of" It's a good point in talking about object-oriented design principles are often invoked repeatedly. An inward category includes those objectives and scope are closely related to the behavior and information. It means that you should not be constructed UI code and mathematical algorithms to achieve the code mixed together, you should make every effort to work closely with customers all the information related to UserAccount type of package. Cohesive design is an important design principle for many reasons: it helps to reduce dependence between categories, making the design more intuitive, easier to understand and make it easier for other developers to the entire design, a decrease of developers need to operate at the same time the number of classes, and so on. For example, if you want to change the site's user authentication mechanism, only a single document to amend a class than to amend a number of documents is no doubt, a number of categories more convenient. Unless a deeper understanding of the various types of uses, it is necessary to estimate the degree of class cohesion is impossible. However, the relationship between these classes can be seen that this design has been successful in reducing the links between different types. Type of interaction between at least be reduced, making the system easy to understand the behavior. More importantly, the amendments to type any of the categories affected by the reduced number of at least (for example, to amend Class D only a direct impact on B-type). In addition, it is necessary to access the functions of class D, we do not know any of the E, F or G-type situation. As a comparison, consider the following diagram: Raise the kind of cohesion. Not closely related to the function of the spread of a number of documents and categories. Using an intuitive, meaningful name. If other people can not understand the type, function or the role of variables, no matter what type of structure is perfect, the whole is still a lack of intuitive design. Excessive use of abbreviations will affect the design of intelligibility. Do not be afraid to rewrite code. In some cases, in several types of functions between the mobile number to greatly simplify the code. Category should remain compact and simple. Code expansion is a type of sign of the lack of cohesion. Too large a class, module or paper is often the lack of clear purpose and objectives. So that other people can review your design. Others may be new ideas, or you think you pointed out that the obvious but the others can not understand the question. In the early design stage performance not too many issues to consider. With a clumsy, to the problems yesterday and compared to optimize the design, a simple, carefully designed more easily adjusted to optimize performance. This is not to suggest attention to the problem behind the performance, but the details of the proposed optimization problem to stay late to consider the project. Interface. A set of interface definitions may act from outside visit. Categories, the Treasury, the implementation of documents, data files can be described by the interface. Interface itself is not the realization of any function, it is just and statements to achieve the object of the interface must be entered into a contract which acts to achieve. Associated. Association is to type two or more connecting. You can for the two types of relations between the more specific information. Association of two or more specific types of relationship between the yuan, which describes the examples of these types of contact element. In a related in the same category can appear in multiple positions.
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