What is &#x27;Contenteditable True Laravel 8&#x27;?In HTML5, we can set the contenteditable=&quot;true&quot; attribute to HTML tags to enable the user to edit the content in the tag on the browser side. Example. The Contenteditable attribute is compatible with all browsers (compatibility with versions before IE6 has not been tested), and in some cases, we can completely replace input or Textarea with a div to enable data collection. For example, when using ajax, we can get the content of a div when submitting a form. The DEMO code is as follows: {     &lt;style type=&quot;text/css&quot;&gt;       .demoEdit{     border:1px solid #dddddd;width:450px;min- height:20px;_height:20px;outline:0px;padding:2px;     } // outline:0px; The style solves the effect of the container getting the focus and displaying a dashed box in FF browsers.       .demoEdit p{     margin:0px;padding:0px;     }     &lt;/style&gt;       &lt;div contenteditable=&quot;true&quot; style=&quot;border:1px solid #dddddd;width:360px;min-height:20px;_height:20px;outline:0px;&quot;&gt;&lt;/div&gt;       &lt;div contenteditable=&quot;true&quot; class=&quot;demoEdit&quot;&gt;&lt;/div&gt;   } The cursor height will be as high as the container height or not show the cursor when the container gets the focus under FF browser, at this time if the container default adds a placeholder, such as &lt;br/&gt; or can solve this problem. The contentEditable property in Html can be used to turn on the editable state of certain elements. Perhaps you have never used the contentEditable property, or even heard of it, the role of contentEditable is quite amazing. You can make divs or entire web pages, as well as spans and other elements set to writable. The most common types of text we use are input and textarea. With the contentEditable property, you can enter content into divs, tables, p, spans, bodies, and many other elements. In particular, contentEditable is now supported in the html5 standard.If you need a VPS to run Laravel 8, you can choose LightNode. We provide stable and high-performance VPS hosting servers. Our VPS nodes locate in more than 20 locations in the world.Go to buy: <a href="https://www.lightnode.com" target="_blank">lightnode.com</a>

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Contenteditable True Laravel 8

Procedural programming and object-oriented programming embody two different ways of thinking for programmers, and this article focuses on the differences and connections between procedural programming and object-oriented programming. procedural programming is a process-centred way of thinking. It starts by analysing the steps needed to solve a problem, and then uses functions to implement these steps step by step, calling them in turn when they are used, a basic sequential way of thinking. The procedural development approach is a layer of abstraction from the underlying structure of the computer, which divides the program into two parts: the data and the operations that manipulate the data, with the core problem being the development and optimisation of data structures and algorithms. Common programming languages that support procedural development include C, COBOL and others. Object-oriented is a systematic way of thinking according to people&#x27;s understanding of the objective world, using the concept of building models based on objects (entities), simulating the objective world to analyse, design and implement software programming ideas, through the object-oriented concept to make computer software systems can correspond with the real world systems one by one. The object-oriented approach treats everything directly as an independent object, and what is considered in the process of dealing with a problem is no longer primarily how to describe it in terms of data structures, but directly how to reproduce the relationship between the various objects in the problem. The underlying implementation of the object-oriented approach also includes procedural thinking. Common programming languages that support object-orientation include C++, C#, Java and others. Specifically, object-oriented and procedural approaches differ in the following four ways. 1) Different starting points Object-oriented uses a conventional way of thinking to deal with problems in the objective world, emphasising the mapping of &quot;actions&quot; in the problem-solving domain directly onto the interfaces between objects. In contrast, process orientation emphasizes the abstraction and modularity of the process, and is process-centred construction or processing of objective world problems. 2) Different levels of logic Object-oriented use of computer logic to simulate the physical existence of the objective world, a collection of classes of objects as a unit to deal with the problem, as far as possible to bring the computer world to the objective world, in order to make the way to deal with the problem more clear and direct, object-oriented use of class hierarchy to reflect the inheritance and development between classes. The basic unit of procedural processing is the module that can clearly and accurately express the process, using the module hierarchy to outline the relationship and function between modules or modules, abstracting the objective world&#x27;s problems into processes that the computer can handle. 3) Different ways of data processing and control procedures Object-oriented data and the corresponding code encapsulated into a whole, in principle, other objects can not directly modify its data, that is, the object can only be modified by its own member functions to complete, control the program is through the &quot;event-driven&quot; to activate and run the program. The procedural approach is to process the data directly through the program, and to display the results of the process once it has been completed, in the control mode is to call or return to the program according to the design, and not to navigate freely. 4) Different ways of analysis and design and coding conversion Object-oriented throughout the software life cycle of analysis, design and coding, is a smooth process, from analysis to design to coding is the use of a consistent model representation, to achieve a seamless connection. In contrast, process orientation emphasises the transformation between analysis, design and coding according to rules throughout the software lifecycle, achieving a seamless connection. A comparison of the characteristics, advantages and disadvantages of object-oriented and procedural approaches is shown below. Object-oriented Features: abstraction, inheritance, encapsulation, polymorphism Advantages: easy to maintain, easy to reuse, easy to extend, low coupling Disadvantages: lower performance than procedural     Procedural Features: modularity of functionality, flow of code Pros: high performance, suitable for resource-constrained, real-time situations Disadvantages: not object-oriented easy to maintain, easy to reuse, easy to extend The object-oriented approach to programming has four basic characteristics. 1) Abstraction: This is the process of ignoring aspects of a subject that are not relevant to the current goal in order to pay fuller attention to aspects that are relevant to the current goal. Abstraction does not intend to understand the whole problem, but only to select a part of it, without using some of the details for the time being. Abstraction consists of two aspects, one being process abstraction and the other being data abstraction. Process abstraction means that any operation that explicitly defines a function can be viewed by the user as a single entity, although this operation may actually be performed by a series of lower-level operations. Data abstraction defines the data type and the operations imposed on an object of that type, and qualifies the value of the object to be modified and observed only through the use of those operations. 2) Inheritance: This is a hierarchical model for linking classes and allows and encourages the reuse of classes, it provides a way to explicitly express commonality. A new class of objects can be derived from an existing class, a process known as class inheritance. The new class inherits the characteristics of the original class, which is called the derived class (child class) of the original class, and the original class is called the base class (parent class) of the new class. A derived class can inherit methods and instance variables from its base class, and the class can modify or add new methods to make it more suitable for particular needs. This also reflects the relationship between the general and the particular in nature. Inheritance is a good solution to the problem of software reusability. 3) Encapsulation: This means that processes and data are enclosed and access to data is only possible through defined interfaces. Object-oriented computing begins with this basic concept that the real world can be portrayed as a series of fully autonomous, encapsulated objects that access other objects through a protected interface. Once the properties of an object have been defined, it is necessary to determine the visibility of these properties, i.e. which properties are visible to the external world and which properties are used to represent internal state. The interface to the object is defined at this stage. As a rule, direct access to the actual representation of an object should be prohibited and the object should be accessed through the operational interface, which is called information hiding. Encapsulation ensures that modules have a good degree of independence and makes it easier to maintain and modify the application. Modifications to the application are limited to the internals of the class, thus minimising the impact of changes to the application. 4) Polymorphism: This means that objects of different classes are allowed to respond to the same message. For example, the same copy-and-paste operation has different effects in a word processor and a drawing program. Polymorphism includes parametric polymorphism and inclusion polymorphism. Polymorphic languages have the advantage of flexibility, abstraction, shared behaviour and shared code, and are a good solution to the problem of homonymy of application functions.

Differences Between Procedural programming and object-oriented programming

1. BackgroundMutually exclusive access to shared resources has traditionally been a problem that many business systems need to solve. In distributed systems, distributed locks are often used as a general-purpose solution.2. From single-computer locking to distributed lockingIn a stand-alone environment, when a shared resource cannot provide mutually exclusive access itself, to prevent data corruption caused by simultaneous read/write access to the shared resource by multiple threads/multi-processes, a third party provides the capability of mutual exclusion, which is often the kernel or a library that provides the capability of mutual exclusion. . If we evolve to a distributed environment, we need a distributed service that provides the same function, different machines get a lock through the service, and the machine that gets the lock can access the shared resources in an exclusive way, so the service is collectively called distributed lock service, and the lock is also called distributed lock.To abstract the concept of distributed locks, first of all, a distributed lock needs to be a resource that provides concurrency control and outputs an exclusive state, that is.Lock = Resource + Concurrency Control + Ownership DisplayAs an example, take a common single lock.Spinlock = BOOL + CAS (optimistic lock)Mutex = BOOL + CAS + notification (pessimistic lock)Spinlock and Mutex are both a Bool resource, via the atomic CAS instruction: when it is now 0 set to 1, it holds the lock if it succeeds and not if it fails if it does not provide a display of ownership, e.g. AtomicInteger, it is also via the resource (Integer) + CAS, but it does not explicitly hint at ownership and therefore will not be, Of course, the &quot;ownership display&quot; can be seen more like a wrapper for some form of service provision.In a stand-alone environment, the kernel has a &quot;God&#x27;s perspective&quot; and can know the survival of the process and release the lock resources held by the process when it hangs, but in a distributed environment, this becomes a challenge, and to cope with various machine failures, downtime, etc., it is necessary to provide a new feature to the lock: availability.Any service that provides three characteristics can provide the ability of distributed locks. The resources can be files, KVs, etc. The availability of locks is ensured by creating atomic operations such as files and KVs, indicating ownership by the result of successful creation, and also by TTL or sessions.3. System Classification of Distributed LocksBased on the security of the lock resource itself, we classify distributed locks into two camps.- distributed systems based on asynchronous replication, such as MySQL, tair, Redis, etc.- distributed consistent systems based on the Paxos protocol, such as a zookeeper, etc., etc.In distributed systems based on asynchronous replication, there is a risk of data loss (lock loss), not safe enough, often through the mechanism of TTL to assume a fine-grained lock service, the system is simple to access, suitable for very time-sensitive services, expect to set a short validity period, perform short-term tasks, and the impact of lock loss on the business is relatively controllable.The distributed system based on the Paxos protocol, which guarantees multiple copies of data through consistency protocols and high data security, often undertakes coarse-grained lock services through the mechanism of leases (sessions), this system requires a certain threshold and is suitable for services that are sensitive to security, wish to hold locks for a long time and do not expect lock loss to occur.

Technical Practice of Distributed Locking in Storage Systems

Process: is a basic unit of concurrently executing programs that allocates and manages resources during execution, and is a dynamic concept that competes for the resources of a computer system.Thread: An execution unit of a process, a scheduling entity within the process section. A basic unit of independent operation that is smaller than a process. Threads are also known as lightweight processes.A program has at least one processor and a process has at least one thread.Differences between processes and threadsAddress space: Threads of the same process share the address space of this process, while processes are independent of each other.Resource ownership: Threads within the same process share the resources of this process such as memory, I/O, CPU, etc., but the resources between processes are independent.When a process crashes, it does not affect other processes in protected mode, but a thread crashes and the whole process dies. So multi-process is more robust than multi-thread.Process switching consumes more resources and is more efficient. So when it comes to frequent switching, it is better to use threads than processes. Similarly, if concurrent operations are required and some variables are shared, only threads can be used and not processes.Execution process: Each independent process has a program entry, a sequential execution sequence, and a program entry. However, threads cannot be executed independently and must be dependent on the application, which provides control over the execution of multiple threads.Threads are the basic unit of processor scheduling, but processes are not.Both can execute concurrently.Thread safety is a concept in computer program code when programming with multiple threads.In programs where multiple threads with shared data are executing in parallel, thread-safe code ensures that each thread can execute properly and correctly without surprises such as data contamination through synchronization mechanisms.Thread safety problems are mostly caused by global and static variables, and local variable escapes may also cause thread safety problems. If each thread has only read operations on global variables and static variables, but no write operations, the global variables are generally thread-safe; if multiple threads perform write operations at the same time, thread synchronization should be considered, otherwise, thread safety may be affected.

Difference Between Threads and Processes? What Is Thread Safety

BGP (Border Gateway Protocol) is a routing protocol used to connect independent systems on the Internet. It is an enhanced, refined, and scalable protocol developed by the Internet Engineering Task Force.BGP4 supports the CIDR addressing scheme, which increases the number of available IP addresses on the Internet.BGP was designed to replace the original Exterior Gateway Protocol, EGP. It is also considered to be a path vectoring protocol.BGP is mainly used for interconnection between Internet AS (Autonomous Systems). The most important function of BGP is to control the propagation of routes and to select the best route. After interconnection using the BGP protocol, all backbone routing devices of network operators will judge the best route to the IP segment of IDC rooms to ensure high-speed access for users of different network operators.The server room that uses the BGP solution to achieve dual-line interconnection or multi-line interconnection is called the BGP server room.Advantages of BGP server room1. The server only needs to set an IP address, and the best access route is determined by the backbone router on the network according to the number of route hops and other technical indicators, which will not take up any system resources of the server. The server&#x27;s uplink and downlink routing can choose the optimal path, so it can truly achieve high-speed single-IP high-speed access.2. because the BGP protocol itself has the characteristics of redundant backup and loop elimination, so when the IDC service provider has more than one BGP interconnection line that can achieve mutual backup of the route, the route will automatically switch to other lines when a line fails.3. the use of BGP protocol can also make the network has strong scalability can be interconnected with other operators IDC network, easy to achieve a single IP multi-line, to do all interconnected operators of the user access are very fast. This is a dual-IP dual-line that can not be compared.BGP server room line technologyBGP is a routing protocol between autonomous systems, and its main function is to exchange network reachability information with other BGP speakers. A BGP speaker is any device configured for BGP. BGP uses TCP as its transport protocol (port 179), which provides reliable data transfer.Two BGP routers form a transport protocol connection. These two routers are called neighbors or peers. Once the transport connection is formed, the two pairs of routers exchange messages to open and confirm the connection parameters. In this step, the routers exchange information such as BGP version number, AS number, duration, BGP identity, and other optional parameters. If any of the parameters do not agree between the peers, an error notification is sent and this peer connection is not established.If the peer routers all agree on these parameters, the entire BGP routing table is exchanged via the UPDATE message, which contains a list of reachable destinations through each system (i.e., Network Layer Reachability Information NLRI) and the path attributes for each route. The path attributes contain information such as the source of the route (ORIGIN) and the level of priority.The BGP table is valid for each peer during the BGP connection. If a routing message changes, neighboring routers use incremental updates (messages) to pass this information. BGP does not require that routing information be refreshed. If no route changes are generated, BGP peers only exchange keepalive messages, which are sent periodically to ensure that the connection is kept alive.BGP server room advantage analysisBGP room is the server renters through the technical means, the actual different operators can access a common IP, and different operators can achieve the fastest access speed between the relevant network technology.BGP server room to a certain extent to solve the problem of north-south interoperability of various users, improve the access speed of users, and the effect of single IP dual lines realized with the BGP protocol. The program is through the BGP protocol, directly one of the lines of IP mapping another line IP, when visitors browse your website, will automatically select the fastest line of access according to the actual situation so that users of various operators can achieve the best access speed.1. The rented server has only one IP, and the user&#x27;s access route is chosen by the router to access according to the visitor&#x27;s actual access speed by selecting the optimal access path. And does not take up any server resources. The server&#x27;s uplink and downlink are routers to choose the best route, so this can achieve the best access speed between operators to achieve the real BGP effect.2. Because the BGP protocol itself has the characteristics of redundant backup, eliminating loops, when you host or rent a server failure, you can achieve mutual backup. The company&#x27;s main business is to provide a wide range of products and services to its customers.3. The BGP server rental is also a good expansion and integration and can be realized and other operators interconnection, easy to achieve a single IP multi-line, so that all interconnected operators of the user access is very fast. This is a dual-IP dual-line server rental that can not be achieved.

What's LightNode's BGP Server Room?

Today, as Linux continues to evolve, the types of file systems supported by Linux are rapidly expanding. With the release of new versions of Linux, a large number of file system possibilities have emerged, each of which supports a different type of file system, making it difficult for users to understand the features and applications of these different versions.Furthermore, based on the open source nature of Linux, more and more medium and large enterprises and governments are investing more resources to develop Linux operating systems. Nowadays, more and more countries in the world are gradually transferring the computers of government agencies to Linux, and the traditional users of Linux are generally professionals who are more willing to install and set up their own operating systems, making these users willing to spend more time on installing and setting up their own operating systems.For this reason, the Linux family of systems is divided into different user groups, such as Ubuntu, LinuxMint and PCLinuxOS, which are considered to be the most user-friendly platforms for new Linux users. SlackwareLinux, GentooLinux and FreeBSD are more advanced distributions that need to be used effectively by users with a certain application base.1. UbuntuUbuntu was first announced in September 2004. Although Ubuntu was a relatively late release of Linux, and the project was not as old as other Linux distributions, its mailing list quickly filled up with eager users and enthusiastic developer discussions. Over the next few years, Ubuntu grew to become the most popular desktop Linux distribution, making a significant effort and contribution towards developing an &quot;easy-to-use and free&quot; desktop operating system that could compete with any of the individual operating systems on the market.2. FedoraAlthough Fedora was officially launched in September 2004, its origins date back to 1995, when it was created by two Linux dreamers - Bob Young and Marc Ewing (the names of Linux at Red Hat). As the company&#x27;s first product, Red Hat Linux 1.0 &quot;Mother&#x27;s Day&quot;, was released in the same year and was quickly updated to fix some bugs. 1997 saw the introduction of Red Hat&#x27;s revolutionary RPM package management solution and other advanced features, which contributed significantly to the distribution&#x27;s rapid rise and popularity, overtaking SlackwareLinux to become the most widely used distribution of Linux in the world. In the following years, Red Hat set a standard, six-monthly release schedule.Although the direction of Fedora is still largely controlled by Red Hat, rightly or wrongly, and sometimes appears as a beta version of Red Hat Enterprise Linux, it cannot be denied that Fedora remains one of the most innovative distributions to this day. Its contributions to the Linux kernel, glibc and GCC are well known, and its more recent feature integration with SELinux, Xen&#x27;s virtualization technology and other enterprise features are appreciated by many corporate customers. The downside is that Fedora still lacks a clear strategy on the desktop to make the product easier to use and go beyond the goal of being a &quot;Linux enthusiast&quot;.3. OpenSUSEThe beginning of openSUSE can be traced back to 1992, when four German Linux enthusiasts launched a project under the SuSELinux operating system (SoftwareundSystemEntwicklung). In the beginning, the young company sold floppy disks with the German version of SlackwareLinux, but soon afterwards in May 1996 SuSELinux was released as a standalone version starting with version 4.2. In the following years, the developers adopted RPM package management and introduced YaST, an easy-to-use graphical system management tool. openSUSE was released frequently, had excellent print documentation, and SuSELinux was easily available in European and North American stores, making SuSELinux increasingly popular.4. MandrivaMandrivaLinux was launched in July 1998 under Mandrakelinux. Initially, this was a re-optimized version of RedHatLinux that included a more friendly KDE desktop, but subsequent versions added a more user-friendly experience, such as a new installer, improved hardware detection, and intuitive disk partitioning utilities. As a result of these improvements, Mandrakelinux was able to flourish. After the introduction of venture capital investment to transform into a commercial company, the newly founded MandrakeSoft&#x27;s fortunes fluctuated greatly from early 2003 to 2005 and was even on the verge of bankruptcy. Later, after a merger with Conectiva of Brazil, the company changed its name to Mandriva as we see it today.5. DebianDebianGNU / Linux was first announced in 1993. Its founder was Ian Murdock, who envisioned creating a distribution for completely non-commercial purposes in his spare time through the hundreds of development volunteers already there. At the time, skeptics far outweighed optimists, believing it was doomed to failure and collapse, but the opposite was true.Debian not only survived, but after almost a decade of vigorous development, it became the largest Linux distribution and probably the largest collaborative software project to date.6. LinuxMintLinuxMint, an Ubuntu-based distribution, was first created in 2006 by Clement Lefebvre, a French-born IT expert who lives and works in Ireland. Originally conceived as a website dedicated to providing help, tips and documentation for new Linux users, Clement Lefebvre saw the potential for the developing Linux to address many of the shortcomings associated with the mainstream products with more practical technologies and alternatives to the mainstream products. After soliciting feedback from visitors to his site, he set out to develop what is today called the perfect Ubuntu Mint.Although LinuxMint is available for free download, the project generates revenue from donations, advertising and professional support services. It does not have a fixed schedule or list of planned release features, but new releases of LinuxMint can be expected within a few weeks after each stable version of LinuxUbuntu.7. PCLinuxOSPCLinuxOS was first announced in 2003 by Bill Reynolds, known as &quot;Textron&quot;. Prior to that he created his own distribution, Texta was a well-known developer who was already known for creating the most popular RPM package management in the Mandrakelinux user community and offering it as a free download. 2003 he decided to build a new distribution, initially based on Mandrakelinux, but containing some important usability improvements. What was his goal? It should be beginner friendly, have excellent support for proprietary kernel modules, browser plugins and media codecs, and be able to provide a simple and intuitive graphical installer for the LiveCD to execute.8. SlackwareThe Slackware Linux operating system was created in 1992 by Patrick Volkerding and is the oldest surviving Linux distribution. From the now defunct SLS Project, Slackware 1.0 started with 24 floppy disks and was on top of the Linux kernel version 0.99pl11-alpha. It quickly became the most popular Linux distribution, with some even estimating its market share of up to 80% of Linux installations in 1995. Its popularity declined significantly with the release of Red Hat&#x27;s Linux and other easier-to-use distributions, but SlackwareLinux remains a much-appreciated and more technically oriented system for system administrators and desktop users in business.SlackwareLinux is a highly technical, clean distribution with only a few very limited personal settings. It uses a simple, text-based system installation and a relatively primitive package management system that does not address software dependencies. As a result, Slackware is considered to be the purest and most unstable distribution available today.9. GentooGentooLinux was conceived around 2000 by Daniel Robbins, formerly a developer under StampedeLinux and FreeBSD. 1.0 of the project was released in March 2002, and Gentoo&#x27;s package management was considered a better alternative to some binary package management systems, especially the then RPM, which was widely used at the time.The GentooLinux operating system was designed for advanced users. Initially, installation was cumbersome and tedious, requiring even hours or even a day to compile and build a complete Linux distribution with the command line, however, in 2006, a project was developed to simplify the installation process of Gentoo&#x27;s liveCD for a &quot;one-click install&quot; program. Gentoo&#x27;s documentation has been repeatedly recognized as one of the best online documentation.10. CentOSLaunched in late 2003, CentOS is a community project that aims to recompile the installable RedHatEnterpriseLinux (RHEL) code and provide timely security updates for all package upgrades. More directly, CentOS is just a RHEL clone. The only difference between the two distribution technologies is the branding, CentOS replaces all Red Hat trademarks and logos as his own.CentOS is often seen as a reliable server distribution. CentOS is a desktop solution that is also suitable for enterprises, especially in terms of stability, reliability and long-term support, and is the first choice for the latest software and features.If you want start a vitual hosting plan with Linux, you may check <a href="https://www.lightnode.com" target="_blank">LightNode</a>. We provide many versions of Linux to choose. Currently, we have CentOS, Debian, Rocky Linux, FreeBSD, and Ubuntu. More versions are on the way.

Introduction to the Top 10 Versions of Linux

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