githttps://github.com/sea-boat/mysql-protocol overview server status identification. More details: https://dev.mysql.com/doc/internals/en/status-flags.htmlServerStatus class package com.seaboat.mysql.protocol.constant;/** * *
<b>server status.</b>* @author *
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<b>email:&</b><p><span style="line-height: 1.76em;">1. <a href="http://www.php.cn/php-weizijiaocheng-365819.html" target="_blank">10 recommended articles about the constant() function</a></span></p><p><span style="line-height: 1.76em;"><img src="/static/imghwm/default1.png" data-src="https://img.php.cn/upload/article/000/000/006/4ba356dcf1027be863fb11d8467ff92c.jpg?x-oss-process=image/resize,p_40" class="lazy" style="max-width:90%" alt="Recommended articles about constant usage examples" ></span></p><p>##Introduction: githttps://github.com/sea-boat/mysql-protocol overview server status identification. More details: https://dev.mysql.com/doc/internals/en/status-flags.htmlServerStatus class package com.seaboat.mysql.protocol.constant;/** *...<span style="line-height: 1.76em;"></span></p><p>2. <span style="line-height: 1.76em;">php Summary of usage of constant() function instances<a href="http://www.php.cn/php-weizijiaocheng-365536.html" target="_blank"></a></span></p><p><span style="line-height: 1.76em;"><img src="/static/imghwm/default1.png" data-src="https://img.php.cn/upload/article/000/000/008/593e2ab9f1866591.png?x-oss-process=image/resize,p_40" class="lazy" style="max-width:90%" alt="Recommended articles about constant usage examples" ></span> </p>##Introduction: When you see this name, it gives you a very high-end feeling. Yes, magic methods are indeed advanced. So, what is a magic method? In PHP, methods starting with two underscores are called "Magic methods". For example, __construct(), __destruct (), __clone(), and __call(),,__get(), __set(),__sleep(), __wakeup(), __toS...<p><span style="line-height: 1.76em;"></span></p>3. <p>Summary of definition and usage of isinstance function<span style="line-height: 1.76em;"><a href="http://www.php.cn/python-tutorials-365445.html" target="_blank"></a></span></p><p><span style="line-height: 1.76em;"><img src="/static/imghwm/default1.png" data-src="https://img.php.cn/upload/article/000/001/506/291ce41d16d7cd043934e0b4a711d4e7.jpg?x-oss-process=image/resize,p_40" class="lazy" style="max-width:90%" alt="Recommended articles about constant usage examples" ></span>##Introduction: English document: isinstance(object, classinfo)Return true if the object argument is an instance of the classinfo argument, or of a (direct, indirect or virtual) subclass thereof. If object is not an object of the...</p> <p><span style="line-height: 1.76em;"></span>4. </p>10 recommended content about the constant() function<p><span style="line-height: 1.76em;"><a href="http://www.php.cn/php-weizijiaocheng-365358.html" target="_blank"></a></span></p><p><span style="line-height: 1.76em;"><img src="/static/imghwm/default1.png" data-src="https://img.php.cn/upload/article/000/000/006/c0965c09168d55f880b9d128ae18ba30.png?x-oss-process=image/resize,p_40" class="lazy" style="max-width:90%" alt="Recommended articles about constant usage examples" ></span>Introduction: githttps://github.com/sea-boat/mysql-protocol overview server status identification. More details: https://dev.mysql.com/doc/internals/en/status-flags.htmlServerStatus class package com.seaboat.mysql.protocol.constant;/** *...</p><p><span style="line-height: 1.76em;"></span>5. </p>Recommend 10 tan source codes (collection) <p><span style="line-height: 1.76em;"><a href="http://www.php.cn/weixin-kaifa-365352.html" target="_blank"></a></span></p><p><span style="line-height: 1.76em;"><img src="/static/imghwm/default1.png" data-src="https://img.php.cn/upload/article/000/000/007/162e19f896a070072167aa8aa27f9c0c.jpg?x-oss-process=image/resize,p_40" class="lazy" style="max-width:90%" alt="Recommended articles about constant usage examples" >##Introduction: This article collects 10 articles about the php atan() function 1. A large summary of PHP mathematical operation functions, classics worth collecting, html calling php functions, excel functions, quadratic functions: php, function: PHP mathematics A large collection of classic operation functions worth collecting: This article summarizes and analyzes PHP mathematical operation functions. Share it with everyone for your reference, the details are as follows: 1. Description of commonly used functions: Abs: Get the absolute value. Acos: Get the arc cosine value. Asin: Get the arcsine value. Atan: Get the arctangent value. Atan2: ...</span></p><p><span style="line-height: 1.76em;">6. </span>Recommended articles about php tan() function</p><p><span style="line-height: 1.76em;"><a href="http://www.php.cn/php-weizijiaocheng-365347.html" target="_blank"></a></span> </p><p><span style="line-height: 1.76em;">##Introduction: This article collects 10 articles about the php atan() function 1. A large summary of PHP mathematical operation functions, a classic worth collecting, an introduction to the quadratic function of html calling php functions, excel functions :php, function: A large summary of PHP mathematical operation functions, a classic worth collecting: This article summarizes and analyzes PHP mathematical operation functions. Share it with everyone for your reference, the details are as follows: 1. Description of commonly used functions: Abs: Get the absolute value. Acos: Get the arc cosine value. Asin: Get the arcsine value. Atan: Get the arctangent value. Atan2: ...<img src="/static/imghwm/default1.png" data-src="https://img.php.cn/upload/article/000/000/006/534cc947ca2b297f6979160207c00e96.jpg?x-oss-process=image/resize,p_40" class="lazy" style="max-width:90%" alt="Recommended articles about constant usage examples" ></span></p><p>7. How to use <span style="line-height: 1.76em;">COnSTANT? Summary of COnSTANT instance usage</span></p><p></p><p><span style="line-height: 1.76em;"><img src="/static/imghwm/default1.png" data-src="https://img.php.cn/upload/article/000/000/008/d7e6ebdde59ab877185f32a28f1f6537.png?x-oss-process=image/resize,p_40" class="lazy" style="max-width:90%" alt="Recommended articles about constant usage examples" ></span></p><p><span style="line-height: 1.76em;">Introduction: githttps://github.com/sea-boat/mysql-protocol overview server status identification. More details: https://dev.mysql.com/doc/internals/en/status-flags.htmlServerStatus class package com.seaboat.mysql.protocol.constant;/** *...</span></p><p><span style="line-height: 1.76em;">8. <a href="http://www.php.cn/php-weizijiaocheng-365289.html" target="_blank">10 recommended content about the atan2() function</a></span></p><p><span style="line-height: 1.76em;"><img src="/static/imghwm/default1.png" data-src="https://img.php.cn/upload/article/000/000/194/791ae5aa168a88fcf1b91e740cd8ae35.jpg?x-oss-process=image/resize,p_40" class="lazy" style="max-width:90%" alt="Recommended articles about constant usage examples" ></span></p><p>##Introduction: This article collects several articles about the php atan2() function. Welcome everyone to watch 1. A large summary of PHP mathematical operation functions. Classic and worth collecting. Introduction to the quadratic function of html calling php functions and excel functions: php, function: A large summary of PHP mathematical operation functions, a classic worth collecting: This article summarizes and analyzes PHP mathematical operation functions. Share it with everyone for your reference, the details are as follows: 1. Description of commonly used functions: Abs: Get the absolute value. Acos: Get the arc cosine value. Asin: Get the arcsine value. Atan: Get the arctangent value. ...<span style="line-height: 1.76em;"></span></p><p>9. <span style="line-height: 1.76em;">Recommended articles about php atan2() function<a href="http://www.php.cn/php-weizijiaocheng-365272.html" target="_blank"></a></span></p><p><span style="line-height: 1.76em;"><img src="/static/imghwm/default1.png" data-src="https://img.php.cn/upload/article/000/000/006/fda116abdbf492963cb8a7000807514f.jpg?x-oss-process=image/resize,p_40" class="lazy" style="max-width:90%" alt="Recommended articles about constant usage examples" ></span></p>##Introduction: This article collects several articles about php atan2() function. Welcome everyone to watch<p><span style="line-height: 1.76em;"></span></p>10. <p>About php atan 10 recommended articles on () function<span style="line-height: 1.76em;"><a href="http://www.php.cn/php-weizijiaocheng-365262.html" target="_blank"></a></span></p><p><span style="line-height: 1.76em;"><img src="/static/imghwm/default1.png" data-src="https://img.php.cn/upload/article/000/000/006/fda116abdbf492963cb8a7000807514f.jpg?x-oss-process=image/resize,p_40" class="lazy" style="max-width:90%" alt="Recommended articles about constant usage examples" ></span>##Introduction: This article collects 10 articles about php atan () function articles</p><p><span style="line-height: 1.76em;"></span>11. </p>Build Aptana Studiode environment in windows<p><span style="line-height: 1.76em;"><a href="http://www.php.cn/python-tutorials-362369.html" target="_blank"></a></span></p><p><span style="line-height: 1.76em;"><img src="/static/imghwm/default1.png" data-src="https://img.php.cn/upload/article/000/001/505/68358db61af083a8f894a22d1413521a.jpg?x-oss-process=image/resize,p_40" class="lazy" style="max-width:90%" alt="Recommended articles about constant usage examples" ></span>Introduction: This article mainly introduces the establishment of Python environment (Aptana Studio) under Windows system. Friends in need can refer to </p><p><span style="line-height: 1.76em;"></span>12. </p> Solve the problem of compilation error when creating .net standard class library in Visual Studio 2017<p><span style="line-height: 1.76em;"><a href="http://www.php.cn/csharp-article-361164.html" target="_blank"></a></span></p><p><span style="line-height: 1.76em;"><img src="/static/imghwm/default1.png" data-src="https://img.php.cn/upload/article/000/001/505/886a9f2fcb47107efdac37a47f495969.jpg?x-oss-process=image/resize,p_40" class="lazy" style="max-width:90%" alt="Recommended articles about constant usage examples" ></span>Introduction: This article mainly This article introduces in detail the causes and solutions of compilation errors when creating .net standard class library in Visual Studio 2017. It has certain reference value. Interested friends can refer to </p><p><span style="line-height: 1.76em;"></span>13. </p>Usage of object-oriented instanceof keyword in php<p><span style="line-height: 1.76em;"><a href="http://www.php.cn/php-weizijiaocheng-360492.html" target="_blank"></a></span></p><p><span style="line-height: 1.76em;"><img src="/static/imghwm/default1.png" data-src="https://img.php.cn/upload/article/000/000/007/58f4808493ff4625.png?x-oss-process=image/resize,p_40" class="lazy" style="max-width:90%" alt="Recommended articles about constant usage examples" >##Introduction: instanceof is new in php5 The keyword has two functions: (1) Determine whether an object is an instance of a certain class, (2) Determine whether an object implements a certain interface. The general format is: ObjectName instanceof ClassName (1) Determine whether an object is an instance of a certain class. Let’s look at an example for the first usage: </span></p><p><span style="line-height: 1.76em;">14. </span>IE6 Also know !important</p><p><span style="line-height: 1.76em;"><a href="http://www.php.cn/div-tutorial-360095.html" target="_blank"></a></span></p><p><span style="line-height: 1.76em;"><img src="/static/imghwm/default1.png" data-src="https://img.php.cn/upload/article/000/000/007/10a83fa31a3e4b01034ed8f2d65f9e4c.png?x-oss-process=image/resize,p_40" class="lazy" style="max-width:90%" alt="Recommended articles about constant usage examples" >Introduction: IE6 also know !important</span></p><p> <span style="line-height: 1.76em;">15. </span>Detailed introduction to the inheritance of JAVA foundation</p><p><span style="line-height: 1.76em;"><a href="http://www.php.cn/java-article-359333.html" target="_blank"></a></span></p><p><span style="line-height: 1.76em;">##Introduction: Inheritance is a very important concept in Java OOP. This article mainly introduces the basic inheritance of JAVA. Friends who need it can refer to it<img src="/static/imghwm/default1.png" data-src="https://img.php.cn/upload/article/000/000/194/ab7727dcacf66b0baa0fb7cf6e5241b0.jpg?x-oss-process=image/resize,p_40" class="lazy" style="max-width:90%" alt="Recommended articles about constant usage examples" ></span></p><p><span style="line-height: 1.76em;">16. <a href="http://www.php.cn/python-tutorials-357750.html" target="_blank">Detailed introduction to Python’s built-in isinstance function</a></span></p><p><span style="line-height: 1.76em;"><img src="/static/imghwm/default1.png" data-src="https://img.php.cn/upload/article/000/000/013/220412047e2ba4759c99affe5baad9cd.png?x-oss-process=image/resize,p_40" class="lazy" style="max-width:90%" alt="Recommended articles about constant usage examples" ></span></p><p><span style="line-height: 1.76em;">Introduction: This This article explains in detail the built-in isinstance function of Python</span></p><p><span style="line-height: 1.76em;">17. <a href="http://www.php.cn/java-article-356706.html" target="_blank">Java-instanceof summary code example</a></span></p><p><span style="line-height: 1.76em;"><img src="/static/imghwm/default1.png" data-src="https://img.php.cn/upload/article/000/000/194/4404740e214d760f6b32818de614ffe5.png?x-oss-process=image/resize,p_40" class="lazy" style="max-width:90%" alt="Recommended articles about constant usage examples" > </span></p><p><span style="line-height: 1.76em;">Introduction: What you see on paper is ultimately shallow, but you definitely know that you have to do it - Lu You Ask the channel how clear it is, so that there is a source of running water - Zhu Xi instanceof is actually Java A binary operator used to determine whether the object on the left is an instance of the specific class on the right or its subclass, and returns boolean type data. Generally, when using non-generic collections (List, set, etc.), instanceof is often used. Since collections can store various objects, corresponding judgments must be made when reading.</span></p><p> <span style="line-height: 1.76em;">18. <a href="http://www.php.cn/js-tutorial-355903.html" target="_blank">In-depth understanding of the difference between typeof and instanceof in JavaScript</a></span></p><p><span style="line-height: 1.76em;"><img src="/static/imghwm/default1.png" data-src="https://img.php.cn/upload/article/000/000/194/89d3c675687544baa3915a9e7bf7bd68.png?x-oss-process=image/resize,p_40" class="lazy" style="max-width:90%" alt="Recommended articles about constant usage examples" ></span></p><p>##Introduction: This Secondly, I will mainly talk about the usage and attention points of JavaScript's type judgment function typeof and judgment constructor prototype instanceof. typeof Let’s talk about typeof first. The first thing to note is that the typeof method returns a string to represent the type of data. For syntax explanation, let’s first look at the values of typeof corresponding to each data type: Data type Type Undefined “undefined” Null “object” Boolean value “boolean” Value “nu..<span style="line-height: 1.76em;"></span></p>##19. <p>Share a summary of the usage of !important in increasing the priority attribute in css<span style="line-height: 1.76em;"><a href="http://www.php.cn/css-tutorial-355812.html" target="_blank"></a></span></p><p><span style="line-height: 1.76em;"><img src="/static/imghwm/default1.png" data-src="https://img.php.cn/upload/article/000/000/013/18ce19417aab158e0318c9658efd4334.png?x-oss-process=image/resize,p_40" class="lazy" style="max-width:90%" alt="Recommended articles about constant usage examples" ></span>##Introduction: !important is only available in Ie7 .0 and firefox can be recognized, but Ie6.0 cannot successfully apply .!important to improve the priority. The following is a summary of its usage </p><p><span style="line-height: 1.76em;"></span>20. </p>HTML5 Optimize Web Animation—requestAnimationFrame<p><span style="line-height: 1.76em;"><a href="http://www.php.cn/html5-tutorial-353905.html" target="_blank"></a></span></p><p><span style="line-height: 1.76em;"><img src="/static/imghwm/default1.png" data-src="https://img.php.cn/upload/article/000/000/194/93447c7de4e2ae8f14c475fb5e119ff1.jpg?x-oss-process=image/resize,p_40" class="lazy" style="max-width:90%" alt="Recommended articles about constant usage examples" >##Introduction: To implement animation in the page, we have many options to use CSS3 transition SMIL-animation can also be used in SVG with animation in CSS3 and keyframes rules. The most original method is that we use JavaScript's setTimeout/setInterval to implement animation. But now we have another method. requestAnimationFrame advantage requestAnimationF</span></p><p><span style="line-height: 1.76em;">21. </span>Java instance - instanceOf keyword usage</p><p><span style="line-height: 1.76em;"><a href="http://www.php.cn/java-article-352170.html" target="_blank"></a></span></p><p><span style="line-height: 1.76em;"><img src="/static/imghwm/default1.png" data-src="https://img.php.cn/upload/article/000/000/194/dc4c6aa00563bf62754e8d28ef5beceb.jpg?x-oss-process=image/resize,p_40" class="lazy" style="max-width:90%" alt="Recommended articles about constant usage examples" >Introduction: instanceof is Java's reserved keyword. Its function is to test whether the object on its left is an instance of the class on its right and return the boolean data type </span>#Instanceof of Java. Simple example of keyword </p><p><span style="line-height: 1.76em;"></span></p><p><span style="line-height: 1.76em;"><a href="http://www.php.cn/java-article-349042.html" target="_blank"></a></span>Introduction: instanceof maintains the concept of type, which refers to: "You Is it this category? Or are you a derived class of this class? ”</p><p><span style="line-height: 1.76em;"><img src="/static/imghwm/default1.png" data-src="https://img.php.cn/upload/article/000/000/194/5ebfb12b404d677ae82e96da62b5c6b4.png?x-oss-process=image/resize,p_40" class="lazy" style="max-width:90%" alt="Recommended articles about constant usage examples" >23. </span>Note 018 The constant() function in PHP</p><p><span style="line-height: 1.76em;"></span></p><p><span style="line-height: 1.76em;"><a href="http://www.php.cn/php-weizijiaocheng-346626.html" target="_blank"></a></span>Introduction: Note 018 constant() function in PHP</p><p></p><p><span style="line-height: 1.76em;">24. <a href="http://www.php.cn/div-tutorial-343115.html" target="_blank">The role of !important in CSS</a></span></p><p><span style="line-height: 1.76em;">Introduction: The role of !important in CSS</span></p><p><span style="line-height: 1.76em;">25. <a href="http://www.php.cn/php-weizijiaocheng-342640.html" target="_blank"> CI framework source code reading, system constant file constants.php configuration </a></span></p><p><span style="line-height: 1.76em;"><img src="/static/imghwm/default1.png" data-src="https://img.php.cn/upload/article/000/000/013/2afe07947aec51e4a19dedf01f55ec49.jpg?x-oss-process=image/resize,p_40" class="lazy" style="max-width:90%" alt="Recommended articles about constant usage examples" ></span></p><p>## Introduction: CI framework source code reading, system constant file constants.php configuration <span style="line-height: 1.76em;"></span></p><p> [Related Q&A recommendations]: <strong></strong></p><p>How to specify Android attribute animation Base point for rotation animation?<a href="http://www.php.cn/wenda/85362.html" target="_blank"></a></p><p>#ios - How to pop up activity indicator when connected to network? <a href="http://www.php.cn/wenda/73786.html" target="_blank"></a></p><p>java - springMVC startup error <a href="http://www.php.cn/wenda/75594.html" target="_blank"></a></p><p>java - SSM framework, the console does not report an error, but reports 404<a href="http://www.php.cn/wenda/106728.html" target="_blank"># when testing the page </a></p>##android - Ask about Fragment fragment = (Fragment) page.getCls().newInstance();<p><a href="http://www.php.cn/wenda/73650.html" target="_blank"></a></p>
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PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.

In PHP, use the clone keyword to create a copy of the object and customize the cloning behavior through the \_\_clone magic method. 1. Use the clone keyword to make a shallow copy, cloning the object's properties but not the object's properties. 2. The \_\_clone method can deeply copy nested objects to avoid shallow copying problems. 3. Pay attention to avoid circular references and performance problems in cloning, and optimize cloning operations to improve efficiency.

PHP is suitable for web development and content management systems, and Python is suitable for data science, machine learning and automation scripts. 1.PHP performs well in building fast and scalable websites and applications and is commonly used in CMS such as WordPress. 2. Python has performed outstandingly in the fields of data science and machine learning, with rich libraries such as NumPy and TensorFlow.

Key players in HTTP cache headers include Cache-Control, ETag, and Last-Modified. 1.Cache-Control is used to control caching policies. Example: Cache-Control:max-age=3600,public. 2. ETag verifies resource changes through unique identifiers, example: ETag: "686897696a7c876b7e". 3.Last-Modified indicates the resource's last modification time, example: Last-Modified:Wed,21Oct201507:28:00GMT.

In PHP, password_hash and password_verify functions should be used to implement secure password hashing, and MD5 or SHA1 should not be used. 1) password_hash generates a hash containing salt values to enhance security. 2) Password_verify verify password and ensure security by comparing hash values. 3) MD5 and SHA1 are vulnerable and lack salt values, and are not suitable for modern password security.

PHP is a server-side scripting language used for dynamic web development and server-side applications. 1.PHP is an interpreted language that does not require compilation and is suitable for rapid development. 2. PHP code is embedded in HTML, making it easy to develop web pages. 3. PHP processes server-side logic, generates HTML output, and supports user interaction and data processing. 4. PHP can interact with the database, process form submission, and execute server-side tasks.

PHP has shaped the network over the past few decades and will continue to play an important role in web development. 1) PHP originated in 1994 and has become the first choice for developers due to its ease of use and seamless integration with MySQL. 2) Its core functions include generating dynamic content and integrating with the database, allowing the website to be updated in real time and displayed in personalized manner. 3) The wide application and ecosystem of PHP have driven its long-term impact, but it also faces version updates and security challenges. 4) Performance improvements in recent years, such as the release of PHP7, enable it to compete with modern languages. 5) In the future, PHP needs to deal with new challenges such as containerization and microservices, but its flexibility and active community make it adaptable.

The core benefits of PHP include ease of learning, strong web development support, rich libraries and frameworks, high performance and scalability, cross-platform compatibility, and cost-effectiveness. 1) Easy to learn and use, suitable for beginners; 2) Good integration with web servers and supports multiple databases; 3) Have powerful frameworks such as Laravel; 4) High performance can be achieved through optimization; 5) Support multiple operating systems; 6) Open source to reduce development costs.


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