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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 486 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 531 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 317 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 622 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 803 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 845 2025-07-09 02:53:21
  • Mastering CSS Object-fit and Object-position for media
    Mastering CSS Object-fit and Object-position for media
    object-fit and object-position can solve the problem of deformed and improper cropping of pictures or videos in web pages. 1.Object-fit controls the filling method. Common values ??include fill (stretch fill), contain (keep the full display of proportion), cover (keep the proportion cover container), none (original size) and scale-down (suitable for dynamic content); 2.Object-position controls the position of the crop area, and the syntax is similar to background-position, which can be used to specify visual focus; 3. Practical applications include mobile avatar cropping, card-style layout unified display, video embedding adaptation and other scenarios; 4. When using it
    CSS Tutorial . Web Front-end 255 2025-07-09 02:52:10
  • Understanding CSS Writing Modes and text orientation
    Understanding CSS Writing Modes and text orientation
    Writing-mode is an attribute in CSS that controls the writing direction of text. Common values ??include horizontal-tb (default), vertical-rl (vertical from right to left) and vertical-lr (vertical from left to right); its common uses include vertical text that supports Japanese and Korean languages, vertical navigation bar layout, PDF reader interface adaptation, etc.; text-orientation is used to control the direction of a single character in vertical mode. Common values ??include mixed (default, Latin characters remain horizontal), upright (all characters are displayed vertically), sideways (characters rotate 90 degrees clockwise); when processing RTL languages ??such as Arabic, dire must be used to deal with RTL languages ??such as Arabic.
    CSS Tutorial . Web Front-end 989 2025-07-09 02:50:30
  • 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 835 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 747 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
  • What is HTML5 Geolocation API?
    What is HTML5 Geolocation API?
    HTML5GeolocationAPI obtains user geolocation information through the browser. The enable method is to use navigator.geolocation.getCurrentPosition() to get the location, provided that the user authorization is. 1. First check whether the browser supports: if("geolocation"innavigator); 2. Call the getCurrentPosition() method to obtain latitude and longitude; 3. Handle user permissions and errors. Notes include: it must run in an HTTPS environment, the mobile terminal is more accurate, the permission management of different browsers is different, the timeout mechanism and alternative solutions such as I
    HTML Tutorial . Web Front-end 678 2025-07-09 02:38:21
  • 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

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