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  • How to deal with PHP session locking?
    How to deal with PHP session locking?
    PHPsessionlockingcausesdelaysinconcurrentrequestsbecauseitblocksotherrequestsuntilthesessionfileisunlocked.Tofixthis,releasesessionsearlywithsession_write_close()afterreadingdata,switchtoalternativehandlerslikeRedisorMemcachedtoavoidlockingandimprove
    PHP Tutorial . Backend Development 753 2025-07-15 02:54:40
  • What are the limitations of recursive functions in PHP (e.g., max stack depth)?
    What are the limitations of recursive functions in PHP (e.g., max stack depth)?
    The maximum stack depth of recursion in PHP is 1024 by default, and if Xdebug is used, the default limit is 100. 1. This limit is controlled by xdebug.max_nesting_level and can be adjusted in php.ini; 2. Exceeding the limit will trigger a fatal error and terminate the script; 3. PHP does not support tail recursion optimization, and each call increases memory and stack consumption; 4. Deep nested data processing, unlimited algorithms and recursion without correct exit conditions are prone to cause problems; 5. Recursion should be avoided in large recursion depth, uncontrollable inputs or production environments; 6. It is recommended to use loops, iterators or generators instead to improve stability and efficiency.
    PHP Tutorial . Backend Development 121 2025-07-15 02:54:20
  • PHP remove whitespace from string
    PHP remove whitespace from string
    There are three main ways to remove spaces in PHP strings. First, use the trim() function to remove whitespace characters at both ends of the string, such as spaces, tabs, line breaks, etc.; if only the beginning or end spaces need to be removed, use ltrim() or rtrim() respectively. Secondly, using str_replace('','',$str) can delete all space characters in the string, but will not affect other types of whitespace, such as tabs or newlines. Finally, if you need to completely clear all whitespace characters including spaces, tabs, and line breaks, it is recommended to use preg_replace('/\s /','',$str) to achieve more flexible cleaning through regular expressions. Choose the right one according to the specific needs
    PHP Tutorial . Backend Development 871 2025-07-15 02:51:31
  • how to use array_reduce on a php array
    how to use array_reduce on a php array
    Youusearray_reduceinPHPtoprocessanarrayandreduceittoasinglevalue.1.Itisidealforsummingvalues,suchastotalinganarrayofnumbers.2.Itcanbuildcustomstrings,likejoiningarrayelementswithcommasand"and".3.Ithelpsingroupingortransformingdata,forexampl
    PHP Tutorial . Backend Development 272 2025-07-15 02:49:10
  • Where are PHP sessions stored?
    Where are PHP sessions stored?
    PHPsessionsarestoredontheserverasfilesinadirectoryspecifiedbythesession.save_pathsetting.1.Bydefault,theyarestoredinatemporarydirectorylike/tmp.2.Theexactpathcanbecheckedusingphpinfo()orsession_save_path().3.Sessionstoragecanbecustomizedbychangingses
    PHP Tutorial . Backend Development 907 2025-07-15 02:48:51
  • Why We Comment: A PHP Guide
    Why We Comment: A PHP Guide
    PHPhasthreecommentstyles://,#forsingle-lineand/.../formulti-line.Usecommentstoexplainwhycodeexists,notwhatitdoes.MarkTODO/FIXMEitemsanddisablecodetemporarilyduringdebugging.Avoidover-commentingsimplelogic.Writeconcise,grammaticallycorrectcommentsandu
    PHP Tutorial . Backend Development 629 2025-07-15 02:48:00
  • How to Install PHP on Windows
    How to Install PHP on Windows
    The key steps to install PHP on Windows include: 1. Download the appropriate PHP version and decompress it. It is recommended to use ThreadSafe version with Apache or NonThreadSafe version with Nginx; 2. Configure the php.ini file and rename php.ini-development or php.ini-production to php.ini; 3. Add the PHP path to the system environment variable Path for command line use; 4. Test whether PHP is installed successfully, execute php-v through the command line and run the built-in server to test the parsing capabilities; 5. If you use Apache, you need to configure P in httpd.conf
    PHP Tutorial . Backend Development 733 2025-07-15 02:46:40
  • PHP Syntax: The Basics
    PHP Syntax: The Basics
    The basic syntax of PHP includes four key points: 1. The PHP tag must be ended, and the use of complete tags is recommended; 2. Echo and print are commonly used for output content, among which echo supports multiple parameters and is more efficient; 3. The annotation methods include //, # and //, to improve code readability; 4. Each statement must end with a semicolon, and spaces and line breaks do not affect execution but affect readability. Mastering these basic rules can help write clear and stable PHP code.
    PHP Tutorial . Backend Development 431 2025-07-15 02:46:20
  • Easy PHP Setup with XAMPP
    Easy PHP Setup with XAMPP
    XAMPP is suitable for beginners or need to quickly build a local PHP environment; it integrates Apache, MySQL, PHP and phpMyAdmin, and is ready for use out of the box; after downloading the corresponding system installation package, install and select necessary components by default; start the Apache and MySQL services in the control panel, modify the port to resolve the conflict problem of port 80; put the PHP file into the htdocs directory and run it, access the test results through the browser, and manage the database through phpMyAdmin.
    PHP Tutorial . Backend Development 777 2025-07-15 02:45:41
  • Working with Strings in PHP
    Working with Strings in PHP
    PHP often uses dot styling, sprintf formatting, strpos search, str_replace replacement, trim cleaning, htmlspecialchars anti-XSS, and urlencode encoding. 1. Use . or sprintf() for splicing; 2. Use strpos() for search, and replace str_replace() for str_replace(); 3. Use trim(), strip_tags(), and htmlspecialchars() for cleaning; 4. Use mb_convert_encoding() for encoding and conversion, and use urlencode()/urldecode() for URL encoding and decoding.
    PHP Tutorial . Backend Development 816 2025-07-15 02:38:40
  • Describe the Null Coalescing Operator (`??`) in PHP
    Describe the Null Coalescing Operator (`??`) in PHP
    PHP's null merge operator (??) is used to check whether a variable or array element exists and is not null. If it exists and has a value, it returns the value, otherwise it returns the specified default value. 1. It solves the problem of providing fallback values when undefined variables or null values, which is more concise and accurate than ternary operators (?:) and isset(); 2. Unlike ?:, ?? only triggers fallback when the value is null, and ?: will also trigger when the value is false (such as empty strings, 0, false); 3. It is often used to deal with default values for hyperglobal variables, optional array keys, class attributes or function parameters; 4. Support chain calls to try multiple options; 5. Note: Accessing undefined variables will still trigger notice, and you need to ensure that the parent variable exists.
    PHP Tutorial . Backend Development 707 2025-07-15 02:37:40
  • PHP prepared statement INSERT multiple rows
    PHP prepared statement INSERT multiple rows
    Inserting data in batches using preprocessing statements in PHP can be achieved in two ways. 1. Use parameterized placeholders to splice SQL, construct INSERT statements of multi-value groups and execute them at one time, suitable for moderate data volume, high efficiency but limited by SQL package size; 2. Perform multiple execute() operations looping in transactions, the logic is clear and easy to maintain, suitable for uncertain amounts of data, with slightly lower performance but combined with transactions can improve speed. Notes include: batch processing to deal with database parameter limitations, correctly matching field types, enabling transactions to reduce I/O operations, and adding exception processing to ensure data consistency.
    PHP Tutorial . Backend Development 888 2025-07-15 02:30:00
  • PHP Commenting Dos and Don'ts
    PHP Commenting Dos and Don'ts
    When writing PHP comments well, you should explain the intention rather than repeat the code to avoid invalid or outdated content. 1. Comments need to explain "why" rather than "what was done", such as explaining business logic rather than just describing variable settings; 2. Use DocBlock to comment functions and classes to facilitate the generation of documents and IDE prompts; 3. Single-line comments are used for special circumstances or reminders; 4. Update comments should be used as part of the code modification to avoid misleading content; 5. Use tags such as //TODO: and //FIXME: to improve readability and maintenance.
    PHP Tutorial . Backend Development 260 2025-07-15 02:29:21
  • PHP Multi-Line Comment Basics
    PHP Multi-Line Comment Basics
    PHP multi-line comments are used/start or ended, and the intermediate content is not executed; they are suitable for scenarios such as explaining complex logic, temporary disable code, document description, etc.; multi-line comments cannot be nested, but they can be used to improve efficiency with IDE shortcut keys.
    PHP Tutorial . Backend Development 383 2025-07-15 02:28:22

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