


[php learning] Notes on the first chapter of PHP introductory classic, PHP Chapter 1_PHP tutorial
Jul 12, 2016 am 08:51 AM[php learning] PHP introductory classic chapter 1 notes, php chapter 1
Chapter 1:
php online manual: http://php.net/manual/zh/index.php
Before starting to learn PHP, let’s first look at what knowledge a qualified PHP programmer should have in the future. Here are just some summaries of the author. I hope it will be helpful to readers in their next studies.
In a broad sense, it is not enough for PHP programmers to only master PHP. They need to master more knowledge in the process of learning PHP, so that they can develop better and more complete software. In the process of setting up the front-end page, you need to master HTML, DIV, CSS, Javascript, etc.; in terms of program security, you need to master basic server configuration knowledge, security filtering permissions, etc.; in terms of program optimization and performance, you need to master the basic knowledge and optimization of the database, etc. .
Before starting to learn the knowledge in this book, you should make the following preparations.
?Have enough confidence and preparation time (many losers give up halfway because they don’t have time).
?A little mathematical foundation (relatively less used, PHP focuses more on logic programming).
?A little basic knowledge of English (just know 26 letters).
?A little bit of network basics (just understand some basic network terms, such as email, HTTP, login, etc.).
1. Simple [Explanation] During the running of the PHP program, the respective functions of the PHP preprocessor, web server and database are briefly described, and the workflow of the PHP program is briefly described
Function of php preprocessor: asp PHP .net web language is the same, through its own calculation mechanism and database query. The results are generated on the server and displayed to the client through HTML.
Function of the web server: The web server is used to receive HTTP requests and respond to this request (such as operating database data according to the client's request), usually in WEB development If the client initiates a request to the server, there must be a WEB server, otherwise no one will accept the request.
Function of database:A database is a set of data organized by a computer, stored in one or more files, and the software that manages this database is called It is a database management system.
Has the following functions:
(1) Data definition function. DBMS provides corresponding data languages ??to define (DDL) database structures, which describe the database framework and are stored in the data dictionary.
(2) Data access function. DBMS provides data manipulation language (DML) to implement basic access operations on database data: retrieval, insertion, modification and deletion.
(3) Database operation management function. DBMS provides data control functions, that is, data security, integrity and concurrency control to effectively control and manage database operations to ensure that the data is correct and effective.
(4) Database establishment and maintenance functions. Including the loading of initial data of the database, database dump, recovery, reorganization, system performance monitoring, analysis and other functions.
(5) Database transmission. DBMS provides the transmission of processing data and realizes communication between user programs and DBMS, which is usually completed in coordination with the operating system.
Workflow of PHP program: PHP is a server-side programming language. The programming statements are similar to C language. Your program logic is translated into HTML hypertext tags that the browser can recognize. Language, displayed in the client browser.
What is the process for a web server to run the php script language?
The web server is used to receive HTTP requests and respond to this request (such as operating database data according to the client's request). Usually in WEB development, if the client initiates a request to the server, then there must be a WEB server, otherwise no one will accept this request. In the early days of WEB development, CGI was used to handle client requests. At that time, there was no language such as PHP designed specifically for WEB development, and it was not possible to separate HTML code and background logic code, so CGI programs The returned results usually contain some HTML code, and the browser receives the entire result and renders it. Later, after development, PHP became a WEB development language that can separate the front and back ends. The PHP code is only responsible for processing the background logic. A large amount of HTML code is placed in a static HTML file. The final rendering result of the browser is the HTML returned by the server. The comprehensive result of code plus JS code plus CSS code and PHP template output. In the early days, the web server was run using CGI as a bridge and then running the PHP scripting language.

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User voice input is captured and sent to the PHP backend through the MediaRecorder API of the front-end JavaScript; 2. PHP saves the audio as a temporary file and calls STTAPI (such as Google or Baidu voice recognition) to convert it into text; 3. PHP sends the text to an AI service (such as OpenAIGPT) to obtain intelligent reply; 4. PHP then calls TTSAPI (such as Baidu or Google voice synthesis) to convert the reply to a voice file; 5. PHP streams the voice file back to the front-end to play, completing interaction. The entire process is dominated by PHP to ensure seamless connection between all links.

The core method of building social sharing functions in PHP is to dynamically generate sharing links that meet the requirements of each platform. 1. First get the current page or specified URL and article information; 2. Use urlencode to encode the parameters; 3. Splice and generate sharing links according to the protocols of each platform; 4. Display links on the front end for users to click and share; 5. Dynamically generate OG tags on the page to optimize sharing content display; 6. Be sure to escape user input to prevent XSS attacks. This method does not require complex authentication, has low maintenance costs, and is suitable for most content sharing needs.

To realize text error correction and syntax optimization with AI, you need to follow the following steps: 1. Select a suitable AI model or API, such as Baidu, Tencent API or open source NLP library; 2. Call the API through PHP's curl or Guzzle and process the return results; 3. Display error correction information in the application and allow users to choose whether to adopt it; 4. Use php-l and PHP_CodeSniffer for syntax detection and code optimization; 5. Continuously collect feedback and update the model or rules to improve the effect. When choosing AIAPI, focus on evaluating accuracy, response speed, price and support for PHP. Code optimization should follow PSR specifications, use cache reasonably, avoid circular queries, review code regularly, and use X

1. Maximizing the commercial value of the comment system requires combining native advertising precise delivery, user paid value-added services (such as uploading pictures, top-up comments), influence incentive mechanism based on comment quality, and compliance anonymous data insight monetization; 2. The audit strategy should adopt a combination of pre-audit dynamic keyword filtering and user reporting mechanisms, supplemented by comment quality rating to achieve content hierarchical exposure; 3. Anti-brushing requires the construction of multi-layer defense: reCAPTCHAv3 sensorless verification, Honeypot honeypot field recognition robot, IP and timestamp frequency limit prevents watering, and content pattern recognition marks suspicious comments, and continuously iterate to deal with attacks.

PHP does not directly perform AI image processing, but integrates through APIs, because it is good at web development rather than computing-intensive tasks. API integration can achieve professional division of labor, reduce costs, and improve efficiency; 2. Integrating key technologies include using Guzzle or cURL to send HTTP requests, JSON data encoding and decoding, API key security authentication, asynchronous queue processing time-consuming tasks, robust error handling and retry mechanism, image storage and display; 3. Common challenges include API cost out of control, uncontrollable generation results, poor user experience, security risks and difficult data management. The response strategies are setting user quotas and caches, providing propt guidance and multi-picture selection, asynchronous notifications and progress prompts, key environment variable storage and content audit, and cloud storage.

PHP ensures inventory deduction atomicity through database transactions and FORUPDATE row locks to prevent high concurrent overselling; 2. Multi-platform inventory consistency depends on centralized management and event-driven synchronization, combining API/Webhook notifications and message queues to ensure reliable data transmission; 3. The alarm mechanism should set low inventory, zero/negative inventory, unsalable sales, replenishment cycles and abnormal fluctuations strategies in different scenarios, and select DingTalk, SMS or Email Responsible Persons according to the urgency, and the alarm information must be complete and clear to achieve business adaptation and rapid response.

PHPisstillrelevantinmodernenterpriseenvironments.1.ModernPHP(7.xand8.x)offersperformancegains,stricttyping,JITcompilation,andmodernsyntax,makingitsuitableforlarge-scaleapplications.2.PHPintegrateseffectivelyinhybridarchitectures,servingasanAPIgateway

Select the appropriate AI voice recognition service and integrate PHPSDK; 2. Use PHP to call ffmpeg to convert recordings into API-required formats (such as wav); 3. Upload files to cloud storage and call API asynchronous recognition; 4. Analyze JSON results and organize text using NLP technology; 5. Generate Word or Markdown documents to complete the automation of meeting records. The entire process needs to ensure data encryption, access control and compliance to ensure privacy and security.
