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  • What is a PHP session?
    What is a PHP session?
    APHPsessionstoresuser-specificdataontheserver,providingsecurityandpersistenceacrosspages.1.Whensession_start()iscalled,PHPgeneratesauniquesessionID.2.ThisIDisstoredinaclient-sidecookieandusedtoretrieveserver-storedsessiondata.3.Sessionvariablesareacc
    PHP Tutorial . Backend Development 488 2025-07-09 03:00:53
  • How to find the Nth occurrence of a substring in PHP
    How to find the Nth occurrence of a substring in PHP
    Finding the Nth occurrence of the substring in PHP can be achieved by combining built-in functions. 1. Use strpos to loop search: initialize the offset variable, loop to call strpos and update the offset until the Nth occurrence position is found or false is returned; 2. Use the regular expression preg_match_all: get all matching positions at once, and then take the Nth index value. The two methods have their own advantages and disadvantages. Strapos is lighter and flexible, suitable for simple searches; preg_match_all is more suitable for complex matching or multi-keyword operations. When applying it in practice, you need to pay attention to boundary conditions, such as the match cannot be found or the input is empty.
    PHP Tutorial . Backend Development 532 2025-07-09 03:00:53
  • PHP wordwrap to break long lines
    PHP wordwrap to break long lines
    wordwrap() is a string processing function used in PHP to automatically break lines. Its function is to wrap long texts in line with the specified number of characters. It allows setting the maximum number of characters per line, line breaks and whether to force break in the middle of a word. For example, using wordwrap($text,40,"\n") can wrap text with up to 40 characters per line, separated by default in spaces; if you need to force the long word to be disconnected, $cut=true should be set; labels should be used when wrapping lines in web pages; Chinese text is recommended to be processed in combination with other functions. Common application scenarios include formatting email text, controlling the log output width, and displaying long text input by users.
    PHP Tutorial . Backend Development 318 2025-07-09 02:57:11
  • How to use PHP sessions without cookies?
    How to use PHP sessions without cookies?
    There are two main ways to run a PHP session without cookies by manually passing the session ID. First, enable URL session ID propagation, and enable PHP to automatically attach the session ID to the link by setting session.use_cookies=0, session.use_only_cookies=0 and session.use_trans_sid=1 in php.ini; second, manually process the session ID, obtain it through session_id() and explicitly pass it in the link or form, and read the ID to restore the session on the subsequent page. Pay attention to security risks such as session fixation, historical leakage and caching issues. Session_regenera should be used
    PHP Tutorial . Backend Development 623 2025-07-09 02:55:41
  • How to use the PHP CLI (Command Line Interface)?
    How to use the PHP CLI (Command Line Interface)?
    The methods to run scripts using PHPCLI include: 1. Make sure that PHP is installed and environment variables are configured, and run phpscript.php to execute scripts; 2. You need to manually add PHP path to environment variables on Windows, and Ubuntu and other systems can install php-cli packages; 3. Common parameters such as -a (interaction mode), -r (execution code), -l (synchronization check), and -S (start the server); 4. Get command line parameters through $argc and $argv, or use getopt() to handle complex options; 5. Actual applications include timing tasks, data import and export, command line tool development and unit testing. After mastering these basic operations, PHPCLI can become an efficient and practical development assistant.
    PHP Tutorial . Backend Development 804 2025-07-09 02:55:01
  • What is PHP Type Juggling and loose comparison?
    What is PHP Type Juggling and loose comparison?
    PHPtypejugglingandloosecomparisoncanleadtounexpectedbehavior.1.Typejugglingautomaticallyconvertsvariabletypesduringoperations,suchasturninganumericstringintoanintegerformath.2.Loosecomparison(==)convertstypesbeforecomparing,making"10"equalt
    PHP Tutorial . Backend Development 847 2025-07-09 02:53:21
  • PHP find the position of the last occurrence of a substring
    PHP find the position of the last occurrence of a substring
    The most direct way to find the last occurrence of a substring in PHP is to use the strrpos() function. 1. Use strrpos() function to directly obtain the index of the last occurrence of the substring in the main string. If it is not found, it returns false. The syntax is strrpos($haystack,$needle,$offset=0). 2. If you need to ignore case, you can use the strripos() function to implement case-insensitive search. 3. For multi-byte characters such as Chinese, the mb_strrpos() function in the mbstring extension should be used to ensure that the character position is returned instead of the byte position. 4. Note that strrpos() returns f
    PHP Tutorial . Backend Development 836 2025-07-09 02:49:21
  • php regex for positive lookahead
    php regex for positive lookahead
    Forward-first assertion is implemented in PHP via (?=...) to match content that is followed by a specific pattern without capturing that part. 1. The syntax format is pattern(?=assertion), such as run(?=ing) matches the run followed by ing; 2. When using it, please note that the regular expression must be wrapped with slashes, and the assertion position should be immediately after the matching content; 3. Common errors include forgetting slashes, assertion position errors, and misunderstandings and not capturing characteristics; 4. Application scenarios include extracting the content before a specific suffix, avoiding mismatch, combining negative assertions, etc.; 5. Use it in conjunction with functions such as preg_match or preg_replace to improve the ability to process complex text.
    PHP Tutorial . Backend Development 748 2025-07-09 02:49:01
  • PHP prepared statement with variable table name
    PHP prepared statement with variable table name
    The reason why the table name cannot be bound with parameters is that preprocessing parameters can only be used for the location of the value, and the table name belongs to the SQL structure part. 1. Whitelist verification: limit the range of optional table names; 2. Use backticks to wrap the table names to avoid keyword conflicts; 3. Map table names from within the program instead of directly using user input; 4. Always verify the input and record abnormal access to ensure security.
    PHP Tutorial . Backend Development 115 2025-07-09 02:45:51
  • Explain PHP Middleware concept in web applications.
    Explain PHP Middleware concept in web applications.
    Middleware is the code layer for handling common requests and responses in PHPWeb applications. Its core functions include authentication, logging, CORS settings and input filtering. 1. The middleware is located between the request and the response, and is processed layer by layer by layer using the "Onion Model"; 2. It is often used to uniformly handle non-business logic tasks; 3. Logic is implemented through the handle() method in frameworks such as Laravel; 4. Unlike the controller, the middleware handles global operations, while the controller focuses on specific business logic; 5. When writing, you need to pay attention to calling the next middleware, avoiding complex operations, keeping the order correct, and not directly outputting the content.
    PHP Tutorial . Backend Development 889 2025-07-09 02:37:40
  • Explain the difference between GET and POST request methods in php context.
    Explain the difference between GET and POST request methods in php context.
    UseGETtoretrievedatawithoutchangingserverstate,asitappendsdatatotheURL,isbookmarkable,andhassizelimits,whilePOSTsendsdatainthebody,hidessensitiveinfo,allowslargerpayloads,andisusedformodifyingserverdata.1.GETisidealforsearches,filters,orpaginationwhe
    PHP Tutorial . Backend Development 335 2025-07-09 02:37:20
  • PHP string to lowercase
    PHP string to lowercase
    PHP provides a variety of string to lowercase methods, suitable for different scenarios. 1. The strtolower() function is suitable for most English scenarios, converting uppercase letters to lowercase, but poor support for non-ASCII characters; 2. mb_strtolower() supports multilingual, more accurate processing of Unicode encoding, and suitable for special characters such as French and German; 3. You can clean spaces or symbols in combination with trim() or preg_replace() to generate slug format; 4. Use LOWER() to achieve fuzzy matching in database queries, pay attention to whether the index is case sensitive. For pure English systems, strtolower() is used, while for internationalization requirements, mb_strtolower() is used.
    PHP Tutorial . Backend Development 288 2025-07-09 02:34:50
  • which php framework is the fastest
    which php framework is the fastest
    Phalcon is the fastest PHP framework, followed by Laminas and Slim. Phalcon compiles in C extensions, with the highest performance; Laminas enables lightweight and flexibility by loading components on demand; Slim is suitable for building small APIs and services; while Laravel is not the fastest, its rich functionality and ease of use make it efficient and practical enough in most projects.
    PHP Tutorial . Backend Development 441 2025-07-09 02:30:31
  • What is the difference between PHP sessions and cookies?
    What is the difference between PHP sessions and cookies?
    The difference between Sessions and cookies is in the location of data storage and management. 1. Cookies are stored in the user's browser and can be viewed and modified, suitable for persisting non-sensitive data; 2. Session data is stored on the server, and only sending session IDs to the browser, suitable for storing sensitive information; 3. Cookies can exist for a long time by default, and the session usually ends with the browser's closing; 4. Use sessions to handle authentication and temporary tracking, and use cookies to remember user preferences; 5. In terms of security, sensitive cookie data must be encrypted, sensitive information should be avoided, session IDs should be protected, and HTTPS transmission should be enabled.
    PHP Tutorial . Backend Development 682 2025-07-09 02:18:01

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