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  • What are PHP PSR standards and why are they important?
    What are PHP PSR standards and why are they important?
    PSRstandardsareasetofcodingguidelinescreatedbyPHP-FIGtopromoteconsistencyandinteroperabilityacrossPHPprojects.TheyincludePSR-1,whichcoversbasiccodingstandardslikeproperuseofPHPtagsandnamingconventions;PSR-4,whichdefinesanautoloadingstandardforclassfi
    PHP Tutorial . Backend Development 802 2025-07-12 02:14:11
  • PHP str_replace using an array for search and replace
    PHP str_replace using an array for search and replace
    PHP's str_replace function supports batch replacement of strings through arrays. 1. One-to-one replacement: Set $search and $replace as arrays, replace one by one in order, such as ['apple','banana'] with ['fruit A','fruit B']; 2. Unified replacement: $search is an array, $replace is a single string, and all matches are replaced with this string, such as ['cat','dog','bird'] with 'animal'; 3. Notes: str_replace is case sensitive, and str_ireplace can ignore case; the replacement order affects the result, and the first match is preferred.
    PHP Tutorial . Backend Development 519 2025-07-12 02:13:51
  • PHP strip_tags how to allow some tags
    PHP strip_tags how to allow some tags
    strip_tags can specify the reserved HTML tags through the second parameter. For example, strip_tags($input,'') can retain and tag. Common retained tags include,,,,,,, and (need to be used with caution). When using, you should avoid retaining,,, and other dangerous tags, and pay attention to the security of src. In actual applications, it is recommended to test and combine functions such as htmlspecialchars to ensure security.
    PHP Tutorial . Backend Development 500 2025-07-12 02:12:41
  • How to measure the memory usage of a single PHP function call?
    How to measure the memory usage of a single PHP function call?
    To measure memory usage of a single PHP function call, use the memory_get_usage() and memory_get_peak_usage() functions. 1. Use memory_get_usage() to obtain the memory difference before and after function execution to calculate the actual increased memory usage; 2. Use memory_get_peak_usage() to obtain the maximum memory peak during function execution, including temporary memory allocated; 3. For more in-depth analysis, enable Xdebug extension to generate performance analysis files, and combine tools such as KCacheGrind to view detailed memory and time consumption, but it should be noted that Xdebug is only applicable to the development environment and should not be produced.
    PHP Tutorial . Backend Development 729 2025-07-12 02:12:20
  • How to store PHP sessions in Redis or Memcached?
    How to store PHP sessions in Redis or Memcached?
    Use Redis or Memcached instead of default file storage to improve PHP session performance and scalability, including: 1. The file locking mechanism is prone to blocking; 2. It does not support cross-server sharing sessions; 3. The cleaning mechanism is inflexible. Redis and Memcached are memory-based storage, fast speed, support expiration mechanisms, and are suitable for distributed environments. The configuration steps are: install the corresponding extension and modify the parameters such as session.save_handler and session.save_path in php.ini. Redis supports persistence and has higher reliability, while Memcached is lighter and suitable for caching. Notes include: 1. Set up a degradation strategy for connection failure; 2.
    PHP Tutorial . Backend Development 837 2025-07-12 02:09:30
  • PHP base64_encode and base64_decode example
    PHP base64_encode and base64_decode example
    Base64 encoding is used in PHP to convert binary data into string format for easy transmission or storage. 1. The base64_encode() function is often used to process the transmission of images, file contents or special characters, such as embedding PNG icons into HTML dataURI to display; 2. The base64_decode() function is used to restore encoded data, such as decoding user information in the API interface; 3. Note when using: Base64 encoding will increase the data volume by about 33%, and cannot be used to encrypt sensitive information. Ulencode processing should be performed when used in URLs or cookies, and the received data needs to be formatted verification to avoid decoding failure.
    PHP Tutorial . Backend Development 632 2025-07-12 02:06:51
  • How do PHP sessions work in frameworks like Laravel or Symfony?
    How do PHP sessions work in frameworks like Laravel or Symfony?
    PHPsessionsinframeworkslikeLaravelandSymfonyfunctionsimilarlytoplainPHPbutwithabstractionandconvenience.1.Sessionsareautomaticallystartedviamiddleware—LaravelusesStartSession,whileSymfonyusesSessionListener.2.Sessiondataisstoredbydefaultinfiles,butbo
    PHP Tutorial . Backend Development 223 2025-07-12 02:01:01
  • Explain the difference between `==` and `===` operators in php.
    Explain the difference between `==` and `===` operators in php.
    The difference between == and == in PHP is that: == is a loose comparison, only the values ??are compared and type conversion is performed, for example, 0=="0" is true; while === is a strict comparison, which compares both values ??and types, such as 0==="0" is false. Common type conversion rules include converting a string to a number when compared to a number, converting a Boolean value to 0 or 1, etc. It is recommended to use === first to avoid unexpected errors. For example, when checking the return value of strpos(), you must use === to determine whether it is false.
    PHP Tutorial . Backend Development 998 2025-07-12 01:54:30
  • php best way to store date in database
    php best way to store date in database
    The safest way to save dates to the database in PHP is: 1. Select the appropriate data type (DATETIME is suitable for long-term storage, TIMESTAMP is suitable for automatic time zone conversion); 2. Use the DateTime class to process time and the unified format is 'Y-m-dH:i:s'; 3. Use UTC in the unified time zone and set the time zone when connecting to MySQL. Avoid storing timestamps directly or using irregular formats to ensure queries, sorting, and cross-language compatibility.
    PHP Tutorial . Backend Development 271 2025-07-12 01:52:41
  • What is the maximum data size you can store in a PHP session?
    What is the maximum data size you can store in a PHP session?
    PHPsessionshavenostrictsizelimit,butstoringlargedatacancauseperformanceandmemoryissues.1.Defaultfile-basedstorageslowsdownwithlargesessiondataduetolocking.2.Largesessionsincreasememoryusageandriskhittingmemorylimits.3.UsescalablehandlerslikeRedisforh
    PHP Tutorial . Backend Development 572 2025-07-12 01:49:40
  • How to debug PHP session problems?
    How to debug PHP session problems?
    The key to solving PHP session problems is to check the call order, configuration, and data flow. 1. Make sure that each page using session calls session_start() correctly before output to avoid spaces, BOM headers or early output content; 2. Check whether the $_SESSION data is repeatedly initialized, unset or overwritten, and confirm the data process through var_dump or log; 3. Check the session.cookie-related configuration to ensure that the cookies are correctly passed, and troubleshoot the browser interception or domain name setting; 4. Check the server error log and enable the PHP error prompt to confirm that the session storage path can be written or extended configuration is correct, and gradually check common omissions are located
    PHP Tutorial . Backend Development 556 2025-07-12 01:47:01
  • What is the purpose of PHP Namespaces?
    What is the purpose of PHP Namespaces?
    PHPnamespacespreventnamingconflictsandorganizecode.Theyallowmultiplefunctions,classes,orconstantswiththesamenametocoexistbygroupingthemintodifferentnamespaces,suchasApp\Utilities\sendEmail()andThirdParty\Email\sendEmail().1.Namespacesfunctionlikefold
    PHP Tutorial . Backend Development 371 2025-07-12 01:41:41
  • PHP check if a string contains a specific word
    PHP check if a string contains a specific word
    In PHP, determine whether a string contains a specific word, the strpos() function is preferred to check whether the keyword exists. This method is efficient but case-sensitive; if it is necessary to be case-insensitive, the strpos() function can be used; to ensure that the complete word is precisely matched, a regular expression should be used to process special characters with \b word boundaries and preg_quote(); for multi-word judgment or complex scenarios, strpos() can be called continuously, logical conditions, or traverse keyword arrays can be traversed to match.
    PHP Tutorial . Backend Development 908 2025-07-12 01:38:50
  • PHP header already sent error
    PHP header already sent error
    The error "Cannotmodifyheaderinformation-headersalreadysent" appears because there is already content output before attempting to send HTTP header information in PHP. 1. Check whether there are spaces or content at the beginning of the PHP file and make sure
    PHP Tutorial . Backend Development 553 2025-07-12 01:25:30

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