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- What are the allowed symbols for identifiers in PHP?
- The symbols allowed for identifiers in PHP include letters, numbers, underscores and Chinese characters. Detailed introduction: 1. Letters and numbers. Identifiers can be composed of letters and numbers. They can start with a letter and can be followed by any number of letters, numbers or underscores; 2. Underline. Identifiers can contain underscores, but not underscores. beginning; 3. Chinese characters. Starting from PHP 7.2, Chinese characters are allowed to be used in identifiers. $Chinese variables, function Chinese functions (), etc. are all legal identifiers, etc.
- PHP Problem 1935 2023-09-18 14:20:03
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- What are the difficulties in building PHP the day after tomorrow?
- Difficulties include environment configuration issues, dependency issues, database connection issues, file path issues, security issues, performance optimization issues, debugging and logging issues, expansion and customization issues, etc. Detailed description: 1. Environment configuration issues, including installing the correct PHP version, configuring the PHP.ini file, setting the correct path and permissions, etc.; 2. Dependency issues, PHP background usually uses some third-party libraries and extensions, such as databases Drivers, template engines, image processing libraries, etc.; 3. Database connection issues, such as querying data, inserting data, etc.
- PHP Problem 1031 2023-09-18 14:19:48
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- What are the 7 PHP string processing functions?
- The seven PHP string processing functions include strlen(), strpos(), substr(), str_replace(), strtolower(), strtoupper(), trim(), etc. Detailed introduction: 1. strlen(), used to obtain the length of a string; 2. strpos(), used to find a specific substring in a string and return the first occurrence position; 3. substr(), used to obtain Substring of string; 4. str_replace(), etc.
- PHP Problem 1202 2023-09-18 14:14:40
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- What are the seven principles of PHP code specifications?
- The seven principles of PHP code specifications include consistency, readability, simplicity, reusability, testability, security and performance. Detailed introduction: 1. Consistency, the code should maintain consistency, that is, use the same naming convention, indentation style, code comments, etc. throughout the entire code base. This can make it easier for team members to understand and read the code, and reduce errors and confusion. Possibility; 2. Readability, the code should be easy to read and understand. In order to improve readability, you can use meaningful variable and function naming, avoid using overly complex expressions and nested structures, etc.
- PHP Problem 1658 2023-09-18 14:12:55
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- What are the three common PHP integrated development tools?
- The three common PHP integrated development tools are PHPStorm, NetBeans, and Eclipse. Detailed introduction: 1. PHPStorm, with powerful code editing, debugging and testing functions, provides intelligent code completion, code navigation, refactoring tools and other functions; 2. NetBeans, provides a comprehensive development environment with code editing, debugging , testing, code navigation and other functions; 3. Eclipse has powerful code editing, debugging, testing and other functions, rich plug-ins and extensions, and can be customized according to development needs.
- PHP Problem 1403 2023-09-18 14:08:43
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- What are the formats for php to generate QR codes?
- The formats of QR codes generated by php include PNG, JPEG, GIF, SVG, EPS, PDF, etc. Detailed description: 1. PNG format, a lossless compressed bitmap graphics file format, commonly used to display images on the Web; 2. JPEG format, a lossy compressed bitmap graphics file format, suitable for storing photos and complex images; 3. GIF format, a bitmap graphics file format that supports animation and transparent backgrounds; 4. SVG format, an XML-based vector graphics file format that can be scaled and resized losslessly, etc.
- PHP Problem 1741 2023-09-18 14:04:02
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- What are the delimiters for php server scripts?
- PHP server script delimiters include "<?php", "<?", "?>", "<!--" and "//-->". Detailed introduction: 1. "<?php", which is the most common start tag in PHP, is used to identify the beginning of the PHP code block. After this tag, any PHP code can be written; 2. "<?" The short tag is another type of start tag in PHP. It is relatively concise and can be modified through settings in the PHP configuration file. Since the short tag may conflict with tags in other languages, its use is not recommended and so on.
- PHP Problem 1459 2023-09-18 13:58:24
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- What elements does a complete php file generally contain?
- The elements included are <?php tags, comments, declaration of namespace, introduction of external files, definition of functions or classes, variable declaration and assignment, control flow statements, database connections and queries, output content, error handling, file operations, end tags, etc. . Detailed description: 1. <?php tag, PHP code must be included between <?php and ?> tags; 2. Comments, explanations and descriptions of the code, will not be executed by the server; 3. Declare the namespace, use naming Space to organize and manage PHP code must be declared at the top; 4. Introduce external files, etc.
- PHP Problem 1596 2023-09-18 13:59:33
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- What are the references for PHP online mall design and implementation?
- References include: 1. "PHP and MySQL Web Development"; 2. "PHP Advanced Programming"; 3. "PHP Objects, Patterns, and Practice"; 4. "Laravel: Up and Running"; 5. "E-commerce" in PHP"; 6. PHP official documentation; 7. Laravel official documentation; 8. PHP website development tutorial; 9. Laravel tutorial; 10. GitHub, etc.
- PHP Problem 2072 2023-09-18 13:50:22
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- What software are there for php web server?
- PHP web servers include Apache HTTP Server, Nginx, Microsoft Internet Information Services, Lighttpd and Caddy, etc. Detailed introduction: 1. Apache HTTP Server. Apache is one of the most popular open source web server software and is widely used in PHP development. It is stable, reliable, supports multiple platforms, has rich functions and flexible configuration options; 2. Nginx, etc. wait.
- PHP Problem 1419 2023-09-15 17:37:33
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- What are the common secondary developments in PHP?
- Common secondary developments in PHP include content management system development, e-commerce platform development, forum and community software development, blog software development, mailing list and newsletter software development, data processing and analysis, network application development and API development, etc. Detailed introduction: 1. Content management system is software used to create, manage and publish website content. PHP provides many powerful CMS, such as WordPress, Drupal and Joomla, which allows developers to easily add and edit content for the website; 2. E-commerce, etc.
- PHP Problem 1739 2023-09-15 17:23:41
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- What are the sudden interruption control characters in php?
- The sudden interruption control characters in PHP include break, continue, die() or exit(), etc. Detailed introduction: 1. break is used to interrupt the execution of the current loop and jump out of the loop. It is usually used together with the loop statement. When a certain condition is met, break will immediately terminate the execution of the loop, jump out of the loop body, and continue executing the steps behind the loop. Code; 2. continue, used to interrupt the execution of the current iteration and continue with the next iteration, usually used with loop statements to skip the remaining code in the current iteration, etc.
- PHP Problem 1239 2023-09-15 16:49:07
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- What are the application scenarios of PHP singleton mode?
- The application scenarios of PHP singleton mode include database connection, cache management, logging, configuration management, object factory and global state management, etc. Detailed introduction: 1. Database connection. In a PHP application, you usually need to interact with the database. In order to avoid frequently creating and destroying database connections, you can use the singleton mode to create a database connection class and ensure that there is only one database connection. Instances exist, which can reduce resource consumption and improve the efficiency of database operations; 2. Cache management, caching is a common performance optimization method, etc.
- PHP Problem 1534 2023-09-15 16:35:21
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- Which functions in php can be used to remove exponentiation values?
- The functions that PHP can use to exponentiate values include pow function, double asterisk, exp function, sqrt function and log function. Detailed introduction: 1. The pow function is used to calculate the y power of x, x is the base and y is the exponent; 2. The double asterisk is the power operator, used to calculate the power of a number; 3. The exp function is used to calculate The x power of the base, e is the base of the natural logarithm, and x is the exponent; 4. The sqrt function is used to calculate the square root of a number, and The logarithm of.
- PHP Problem 990 2023-09-15 16:25:17
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- What are the differences between the version of php7 and 5?
- The differences between the version of php7 and 5 include performance improvements, scalar type declarations, return value type declarations, exception handling improvements, anonymous classes, syntax improvements, new operators, enhanced error handling and the removal of some old features. Detailed introduction: 1. Performance improvement. PHP7 introduces a new Zend engine, named Zend Engine 3.0, which brings significant performance improvement. The performance of PHP7 is approximately twice that of PHP5, mainly through improved memory management. , optimized function calls and exception handling, enhanced garbage collection, etc.
- PHP Problem 1289 2023-09-15 16:11:55
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