Found a total of 10000 related content
Optimize PHP Code: Reducing Memory Usage & Execution Time
Article Introduction：TooptimizePHPcodeforreducedmemoryusageandexecutiontime,followthesesteps:1)Usereferencesinsteadofcopyinglargedatastructurestoreducememoryconsumption.2)LeveragePHP'sbuilt-infunctionslikearray_mapforfasterexecution.3)Implementcachingmechanisms,suchasAPC
2025-05-10
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436
How Does the JIT (Just-In-Time) Compiler in PHP 8 Boost Performance?
Article Introduction：PHP 8's Just-In-Time (JIT) compiler dramatically boosts performance by compiling frequently executed bytecode to optimized machine code. This significantly reduces execution time, improves throughput, and lowers CPU usage, especially for computation
2025-03-10
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677
php get yesterday's date
Article Introduction：There are three ways to get yesterday's date in PHP: use the strtotime() function, combine the date() function to output detailed time, or use the DateTime class for flexible processing. The first method directly obtains yesterday's date through echodate('Y-m-d',strtotime('yesterday')); the second method can output the full time containing time, minutes and seconds, such as echodate('Y-m-dH:i:s',strtotime('yesterday')); the third method uses the object-oriented DateTime class to facilitate the execution of complex date operations, such as adding and subtracting days or setting time zones, with the code as $date=n
2025-07-04
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146
How to Profile PHP 7 Code to Find Bottlenecks?
Article Introduction：This article explains how to profile PHP 7 code to identify performance bottlenecks. It details using tools like Xdebug, Blackfire.io, XHProf, and Tideways, analyzing profiling results (execution time, memory usage, call counts), and addressing com
2025-03-10
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362
PHP gets the year, month, day, hour, minute, second between the specified time period, php gets_PHP tutorial
Article Introduction：PHP gets the year, month, day, hour, minute, and second between the specified time period. PHP gets it. PHP gets the year, month, day, hour, minute, and second between the specified time period. PHP gets the core code: Class Utils { /** * format MySQL DateTime (YYYY-MM-DD hh:mm:ss) put mysql The data found
2016-07-12
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1090
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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624
How to use PHP online compiler?
Article Introduction：Use PHP online compiler to be convenient and fast, suitable for testing code snippets or learning stages. The process includes: 1. Select a platform that supports new PHP version, has input and output windows, and can save code such as OnlineGDB, JDoodle or Replit; 2. Create a new PHP file in the editing area and write the code; 3. Click the Run button to view the execution results, such as outputting "Hello, world!". However, restrictions should be paid attention to: 1. Lack of a complete server environment and cannot configure Apache or Nginx; 2. File read and write permissions are limited; 3. Execution time may be limited, and scripts will be interrupted for a long time. For complete project development, it is recommended to build a local environment or use a cloud server.
2025-06-27
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549
setTimeout JavaScript Function: Guide with Examples
Article Introduction：JavaScript's setTimeout function detailed explanation: Implement delayed execution
setTimeout is a native function in JavaScript that is used to call functions or execute code snippets after a specified delay (milliseconds). This is useful in many scenarios, such as displaying a pop-up window after the user browses the page for a while, or adding a brief delay before removing the element hover effect (preventing misoperation).
Key points:
JavaScript's setTimeout function allows the execution of functions or code snippets after a specified number of milliseconds, which is very useful for tasks such as displaying popups after a certain browsing time.
setTimeout Acceptance letter
2025-02-10
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926
PHP header location vs javascript redirect
Article Introduction：The jump mechanism of PHP ("Location:...") and JavaScript are different from the applicable scenarios. 1. The execution time is different: PHP is a server-side jump, and the browser jumps immediately after receiving the response, and does not depend on whether JS is enabled; JS is a browser-side jump, and the page is executed after the page is loaded, and it will be invalid if JS is disabled. 2. SEO friendly: PHP is more suitable for SEO, supports 301/302 status code, which is conducive to search engine recognition; JS is not friendly enough to crawlers. 3. Interactiveness: JS is more flexible and suitable for jumping based on user behavior or conditions. 4. Security and limitations: PHP uses header()
2025-07-12
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809
How to simplify performance monitoring in PHP projects using Composer
Article Introduction：When developing PHP projects, we often need to monitor the execution time of the code to optimize performance. In one of my recent projects, I encountered a problem: I needed to do precise timing between different code segments, but manually implementing the timer is not only tedious, but also error-prone. After some exploration, I discovered the library phpunit/php-timer, which is easily integrated through Composer, greatly simplifying my work.
2025-04-17
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289
Understanding Microtasks and Macrotasks in JavaScript's Event Loop Model
Article Introduction：Macro tasks are a complete execution unit for each processing in the event loop. Common types include setTimeout and setInterval callbacks, user interaction event processing, page rendering and update, etc. Only one macro task is processed in each event loop. Microtasks have higher priority than macrotasks. Common types include Promise.then/.catch/.finally, queueMicrotask, and MutationObserver. They immediately clear the microtask queue after the current macrotask is completed before executing the next macrotask. For example, the output order in the code is Start→End→Promisethen→Timeout, which reflects that the execution time of microtasks is earlier.
2025-07-11
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110
PHP Master | Exceptional Exceptions
Article Introduction：Core points
PHP exception is a special class that can be thrown and caught to indicate unexpected events. Unlike unrecoverable errors, exceptions are intended to be processed by the calling code and bubble upward along the execution chain until they are caught.
The difference between PHP errors and exceptions is that the error is irrecoverable and occurs in the main execution loop, indicating that there is a problem with the stability of the code or environment; while the exception is recoverable and may occur outside the main execution loop, and does not indicate the system. Unstable.
Not all non-successful situations require exceptions to be thrown. Exceptions should be thrown only if they really cannot continue execution. This means that an action that is not a normal operation or standard, an abnormality, deviates from normal and expected situations.
Throw a general Exception
2025-02-25
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750
PHP Master | Debugging and Profiling PHP with Xdebug
Article Introduction：Xdebug: Powerful debugging and performance analysis tools for PHP developers
Core points:
Xdebug is a powerful, free and open source PHP extension that provides debugging support, stack trace, performance analysis, code coverage and other functions. It allows developers to pause the execution of the application at any time and check the value of variables to better understand how PHP is running.
Xdebug can be used as a performance analysis tool for PHP applications, recording important details such as statements and functions execution time and number of calls. Analyzing these outputs allows you to understand where the bottleneck lies, thereby optimizing your application for performance.
To use Xdebug, it needs to be installed and configured correctly. XAMPP or MAMP is pre-installed with XDEbug.
2025-02-25
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1045
php add days to date
Article Introduction：It is recommended to use the DateTime class to add a number of days to dates in PHP, with clear code and flexible functions. The DateTime class introduced in PHP5.2 supports object-oriented operations. The example code is: $date=newDateTime('2024-10-01'); $date->modify('5days'); echo$date->format('Y-m-d'); The output result is 2024-10-06; this method is highly readable and supports time zone setting and formatting output. You can also use strtotime() to implement it, but you need to pay attention to the time zone problem. The example is: $newDate=date("
2025-07-05
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773
Can PDFs have viruses in them?
Article Introduction：Will PDF files carry viruses? The answer is yes, but most PDF files do not contain malware. This article will guide you how to identify and clear malicious PDF files to protect your device's security.
How to carry viruses in PDF files?
Malware can penetrate PDF files through a variety of ways:
Editable content and dynamic elements: Dynamic elements such as editable parts, date and time display and calculation functions of PDF files require code execution, which provides an opportunity for virus installation.
JavaScript and System Commands: PDF files can contain JavaScript code and execute system commands, which makes it an ideal carrier for malware. Although Adobe has disabled system life in many PDFs
2025-04-06
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799
php get week number from date
Article Introduction：Getting the number of weeks corresponding to dates in PHP can be achieved through built-in functions. The main methods are: 1. Use the date() function to match the 'W' format character to obtain the ISO-8601 standard number of weeks, such as $weekNumber=date('W',strtotime('2025-04-05')); 2. Use the DateTime class to process the time and time zone more flexibly, such as $date=newDateTime('2025-04-05'), $weekNumber=$date->format('W'); 3. Custom logic adapts to the differences in weekly start dates in different regions. If the weekly start date is set to Sunday, the date calculation needs to be manually adjusted. Note the return value
2025-07-06
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825
