Found a total of 10000 related content
Benchmarking Python Code Performance
Article Introduction：To improve Python code performance, benchmarking should be conducted in advance to find bottlenecks. 1. Use the timeit module to quickly measure small pieces of code, and reduce errors by running multiple times; 2. Use cProfile to analyze the performance distribution of the entire program, and combine the pstats module to filter the most time-consuming functions; 3. Avoid misunderstandings such as running only once, ignoring the I/O impact, premature optimization, etc., and ensure the consistent test environment; 4. Use third-party tools such as Py-Spy, line_profiler and memory_profiler to achieve finer granular performance analysis and memory monitoring.
2025-07-21
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829
How to solve the problems of PHP project construction and automation? Use Composer to install Phing!
Article Introduction：How to efficiently manage the build, test, and deployment process is a common problem when developing a PHP project. I've encountered a dilemma in a project: Every time a new version is released, I have to manually perform a series of complex operations, including running tests, generating documentation, and deploying code. This is not only time-consuming and labor-intensive, but also prone to errors. After some exploration, I found Phing, a powerful PHP project building tool, which was easily installed and used through Composer, completely solving my problem.
2025-04-17
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286
Running Your First PHP Script
Article Introduction：To run the first PHP script, you must first build a server environment, and then write basic code to test and run. 1. Locally install integrated environments such as XAMPP, WAMP or MAMP; 2. Use PHP that comes with Mac or Linux system; 3. Run code through an online PHP editor; 4. Place the PHP file in the server directory such as http://htdocs; 5. Write the included .php file; 6. Visit http://localhost/test/index.php through the browser to view the results; 7. Pay attention to check whether the server is running, whether the path is correct and whether the syntax is wrong; 8. You can try to output time or process forms and deepen your understanding.
2025-07-17
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436
How does Java work?
Article Introduction：The running mechanism of Java programs mainly includes compilation into bytecode, JVM execution and automatic memory management. First of all, Java code is compiled into platform-independent bytecode (.class file) through javac, realizing "write once, run everywhere". Next, the JVM loads the bytecode and interprets it by the execution engine or compiles it into machine code through JIT. At the same time, the JVM is also responsible for class loading, memory management and garbage collection. Then, the class loader (ClassLoader) loads class files from disk or network, and the runtime data area includes heap, stack, method area, etc. for data storage for program operation. Finally, the garbage collection mechanism automatically recognizes and frees object memory that is no longer in use, avoiding the complexity of manual memory management. The whole process starts
2025-06-27
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633
how to connect to mysql database from java
Article Introduction：To connect a Java program to a MySQL database, you need to prepare dependencies, load drivers, and establish connections. 1. Add MySQL driver dependencies. The Maven project introduces mysql-connector-java in pom.xml. The jar package is manually added to non-Maven projects; 2. explicitly load the JDBC driver class and use Class.forName("com.mysql.cj.jdbc.Driver") to ensure compatibility; 3. Correctly configure the URL, username and password when establishing a connection, pay attention to the database address, port, time zone and SSL settings; if the connection fails, check the MySQL running status, network access permissions, username and password
2025-07-14
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956
Get PHP Running on Your System
Article Introduction：There are four steps to make PHP run on the system: installation, configuration, testing and troubleshooting. First, you need to select the appropriate version to install according to the operating system. Windows can use XAMPP or WAMP, Mac uses brewinstallphp, and Linux uses sudoaptinstallphp; secondly, configure the php.ini file, set the time zone, error report, etc., and confirm that the Apache/Nginx module is loaded; then test whether it is running normally by executing phpinfo(); finally solve common problems such as environment variables not set, insufficient permissions, port conflicts or multiple version confusion. Follow these steps to enable PHP successfully.
2025-07-17
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1022
Refactoring Legacy PHP to Adhere to SOLID Principles
Article Introduction：To refactoring legacy PHP code, the answer is to improve the maintainability, testability and flexibility of the code through gradual improvement rather than one-time rewrite; specific practices include: 1. Follow the principle of single responsibility and split the classes that undertake too many responsibilities into small classes that are only responsible for specific functions; 2. Follow the principle of opening and closing, expand functions through interfaces and polymorphic mechanisms rather than modifying the original code; 3. Follow the principle of Rich's replacement to ensure that the subclass can transparently replace the parent class without changing the correctness of the program; 4. Follow the principle of interface isolation and split the bloated interface into smaller dedicated interfaces; 5. Follow the principle of dependency inversion, and make high-level modules depend on abstraction rather than concrete implementation through dependency injection; in actual operation, tests should be written first, problem codes should be identified, refactored in small steps, and borrowed
2025-07-25
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397
Dave The Diver: How To Catch Spider Crabs
Article Introduction：In Dave The Diver, there are some creatures that are not easy to catch. Or, catch alive that is. The spider crab is one of those very species, making it seem like the only way to bring these crustaceans back up to land is to viciously crack them up w
2025-01-10
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853
Prepare for Interview Like a Pro with Interview Questions CLI
Article Introduction：Prepare for Interview Like a Pro with Interview Questions CLI
What is the Interview Questions CLI?
The Interview Questions CLI is a command-line tool designed for JavaScript learners and developers who want to enhance their interview
2025-01-10
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1484
Soft Deletes in Databases: To Use or Not to Use?
Article Introduction：Soft Deletes: A Question of DesignThe topic of soft deletes, a mechanism that "flags" records as deleted instead of physically removing them, has...
2025-01-10
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1081
