国产av日韩一区二区三区精品,成人性爱视频在线观看,国产,欧美,日韩,一区,www.成色av久久成人,2222eeee成人天堂

current location：Home > Technical Articles > Daily Programming > PHP Knowledge

  • How to URL encode a string in PHP with urlencode
    How to URL encode a string in PHP with urlencode
    The urlencode() function is used to encode strings into URL-safe formats, where non-alphanumeric characters (except -, _, and .) are replaced with a percent sign followed by a two-digit hexadecimal number. For example, spaces are converted to signs, exclamation marks are converted to!, and Chinese characters are converted to their UTF-8 encoding form. When using, only the parameter values ??should be encoded, not the entire URL, to avoid damaging the URL structure. For other parts of the URL, such as path segments, the rawurlencode() function should be used, which converts the space to . When processing array parameters, you can use http_build_query() to automatically encode, or manually call urlencode() on each value to ensure safe transfer of data. just
    PHP Tutorial . Backend Development 443 2025-07-11 03:22:01
  • How to compare two strings for similarity in PHP with similar_text or levenshtein
    How to compare two strings for similarity in PHP with similar_text or levenshtein
    In PHP, we mainly use similar_text() and levenshtein() functions to compare string similarity; 1. Similar_text() returns the similarity percentage or the number of matching characters, suitable for fuzzy search and repeated content detection; 2. levenshtein() returns the editing distance, suitable for automatic error correction and input correction; 3. The selection basis is the requirement: if the percentage is required, select similar_text(), and if the number of steps is required, use levenshtein().
    PHP Tutorial . Backend Development 989 2025-07-11 03:20:51
  • PHP get the last N characters of a string
    PHP get the last N characters of a string
    There are two main ways to get the last N characters of a string in PHP: 1. Use the substr() function to intercept through the negative starting position, which is suitable for single-byte characters; 2. Use the mb_substr() function to support multilingual and UTF-8 encoding to avoid truncating non-English characters; 3. Optionally determine whether the string length is sufficient to handle boundary situations; 4. It is not recommended to use strrev() substr() combination method because it is not safe and inefficient for multi-byte characters.
    PHP Tutorial . Backend Development 175 2025-07-11 03:17:20
  • PHP get the first N characters of a string
    PHP get the first N characters of a string
    You can use substr() or mb_substr() to get the first N characters in PHP. The specific steps are as follows: 1. Use substr($string,0,N) to intercept the first N characters, which is suitable for ASCII characters and is simple and efficient; 2. When processing multi-byte characters (such as Chinese), mb_substr($string,0,N,'UTF-8'), and ensure that mbstring extension is enabled; 3. If the string contains HTML or whitespace characters, you should first use strip_tags() to remove the tags and trim() to clean the spaces, and then intercept them to ensure the results are clean.
    PHP Tutorial . Backend Development 307 2025-07-11 03:17:00
  • How to prevent session hijacking in PHP?
    How to prevent session hijacking in PHP?
    To prevent session hijacking in PHP, the following measures need to be taken: 1. Use HTTPS to encrypt the transmission and set session.cookie_secure=1 in php.ini; 2. Set the security cookie attributes, including httponly, secure and samesite; 3. Call session_regenerate_id(true) when the user logs in or permissions change to change to change the SessionID; 4. Limit the Session life cycle, reasonably configure gc_maxlifetime and record the user's activity time; 5. Prohibit exposing the SessionID to the URL, and set session.use_only
    PHP Tutorial . Backend Development 243 2025-07-11 03:15:51
  • PHP explode string by delimiter
    PHP explode string by delimiter
    In PHP, use the exploit() function to split strings by separator. The basic usage is exploit(separator, string, limit), where separator is the required separator, string is the string to be split, and limit is the optional parameter to limit the number of array elements. For example, $arr=explode(",","apple,banana,orange") will return ['apple','banana','orange']; continuous separators such as "a,,b" will produce empty string elements; if the separator is an empty word
    PHP Tutorial . Backend Development 664 2025-07-11 03:15:21
  • How Do Generators Work in PHP?
    How Do Generators Work in PHP?
    AgeneratorinPHPisamemory-efficientwaytoiterateoverlargedatasetsbyyieldingvaluesoneatatimeinsteadofreturningthemallatonce.1.Generatorsusetheyieldkeywordtoproducevaluesondemand,reducingmemoryusage.2.Theyareusefulforhandlingbigloops,readinglargefiles,or
    PHP Tutorial . Backend Development 615 2025-07-11 03:12:10
  • How do you handle exceptions in php using `try...catch` blocks?
    How do you handle exceptions in php using `try...catch` blocks?
    Using try...catch blocks in PHP is an effective way to manage errors and unexpected behavior. 1. An exception is an object thrown during execution, indicating that a problem occurs, such as calling a non-objective method or opening a non-existent file. 2. The try block contains code that may have errors, the catch block catches and handles exceptions, and obtains messages, codes and other information through $e. 3. Multiple catch blocks can be used to handle different types of exceptions in a specific to common order. 4. Exceptions can be thrown manually to verify input or execute business rules, but abuse should be avoided. 5. It is recommended to use meaningful exception messages, create custom exception classes appropriately, and note that finally blocks can be used for cleaning operations.
    PHP Tutorial . Backend Development 410 2025-07-11 03:09:41
  • What is PHP Dependency Injection and its benefits?
    What is PHP Dependency Injection and its benefits?
    DependencyinjectioninPHPisadesignpatternthatenhancesflexibilityandtestabilitybyallowingdependenciestobepassedintoclassesratherthanhardcoded.Insteadofcreatingdependenciesinsideaclass,suchas$this->db=newDatabase();,dependencyinjectionpassesthemviaco
    PHP Tutorial . Backend Development 693 2025-07-11 03:02:41
  • How to use substr_replace in PHP
    How to use substr_replace in PHP
    substr_replace is a function in PHP to replace the contents of the specified position in a string. Its syntax is substr_replace($string,$replace,$start,$length), where $start represents the start position and $length is an optional parameter that represents the replacement length. For example, substr_replace("Helloworld!","PHP", 6, 5) output HelloPHP! Common uses include: 1. Replace the content of the specified location, such as replacing "sunny" with "rainy&quo
    PHP Tutorial . Backend Development 882 2025-07-11 03:00:40
  • What is the role of the `__construct` and `__destruct` methods in php classes?
    What is the role of the `__construct` and `__destruct` methods in php classes?
    InPHP,__constructand__destructarespecialmethodsusedforobjectinitializationandcleanup.1.__constructrunsautomaticallywhenanobjectiscreated,allowingsetupactionslikeassigninginitialvaluesorconnectingtoadatabase.2.Itcanacceptargumentsandiscommonlyusedtoin
    PHP Tutorial . Backend Development 887 2025-07-11 03:00:02
  • php date to timestamp
    php date to timestamp
    There are two main ways to convert date strings to Unix timestamps in PHP. 1. Use the strtotime() function to be suitable for date strings in standard formats, such as "2024-12-2514:30:00", but the processing of non-standard or Chinese format is weak; 2. Use the DateTime::createFromFormat() method to accurately match the specified format, which is suitable for processing non-standard format data, such as user input or CSV data; 3. For date strings containing Chinese characters, they can be converted into standard format first through str_replace() or regular expression before parsing. When selecting a method, you need to judge based on the specific scene: use strto for simple scenes
    PHP Tutorial . Backend Development 1006 2025-07-11 02:55:40
  • Does closing the browser destroy the PHP session?
    Does closing the browser destroy the PHP session?
    Close the browser will not automatically destroy the PHP session, depending on the session configuration. 1. By default, PHP uses session cookies without expiration time. Close the browser will delete the cookie, but the server-side session data still exists until it is cleaned up by the garbage collection mechanism; 2. If the expiration time of the cookie is manually set, closing the browser will not delete the cookie, and the user can still resume the session the next time he accesses; 3. To ensure that closing the browser ends the session, the default behavior or explicitly clear the cookie and session data; 4. Server-side cleanup is not instant, and it depends on configuration parameters such as session.gc_maxlifetime and garbage collection mechanism. Therefore, configure the session settings reasonably and implement
    PHP Tutorial . Backend Development 168 2025-07-11 02:54:01
  • How to change the session timeout in PHP?
    How to change the session timeout in PHP?
    Adjusting the session timeout in PHP requires modifying the configuration and code logic. 1. Modify the session.gc_maxlifetime parameter in php.ini, if set to 86400 seconds to extend the timeout. 2. Set session.cookie_lifetime to control the survival time of the browser cookie, such as set to 86400 seconds to maintain login status. 3. Use ini_set and session_set_cookie_params to dynamically set the timeout time, which is suitable for environments where php.ini cannot be modified. 4. Pay attention to problems that are easily overlooked in actual development such as garbage collection mechanism, file permissions, domain name sharing, etc., and ensure that
    PHP Tutorial . Backend Development 891 2025-07-11 02:44:51

Tool Recommendations

jQuery enterprise message form contact code

jQuery enterprise message form contact code is a simple and practical enterprise message form and contact us introduction page code.
form button
2024-02-29

HTML5 MP3 music box playback effects

HTML5 MP3 music box playback special effect is an mp3 music player based on HTML5 css3 to create cute music box emoticons and click the switch button.

HTML5 cool particle animation navigation menu special effects

HTML5 cool particle animation navigation menu special effect is a special effect that changes color when the navigation menu is hovered by the mouse.
Menu navigation
2024-02-29

jQuery visual form drag and drop editing code

jQuery visual form drag and drop editing code is a visual form based on jQuery and bootstrap framework.
form button
2024-02-29

Organic fruit and vegetable supplier web template Bootstrap5

An organic fruit and vegetable supplier web template-Bootstrap5
Bootstrap template
2023-02-03

Bootstrap3 multifunctional data information background management responsive web page template-Novus

Bootstrap3 multifunctional data information background management responsive web page template-Novus
backend template
2023-02-02

Real estate resource service platform web page template Bootstrap5

Real estate resource service platform web page template Bootstrap5
Bootstrap template
2023-02-02

Simple resume information web template Bootstrap4

Simple resume information web template Bootstrap4
Bootstrap template
2023-02-02

Cute summer elements vector material (EPS PNG)

This is a cute summer element vector material, including the sun, sun hat, coconut tree, bikini, airplane, watermelon, ice cream, ice cream, cold drink, swimming ring, flip-flops, pineapple, conch, shell, starfish, crab, Lemons, sunscreen, sunglasses, etc., the materials are provided in EPS and PNG formats, including JPG previews.
PNG material
2024-05-09

Four red 2023 graduation badges vector material (AI EPS PNG)

This is a red 2023 graduation badge vector material, four in total, available in AI, EPS and PNG formats, including JPG preview.
PNG material
2024-02-29

Singing bird and cart filled with flowers design spring banner vector material (AI EPS)

This is a spring banner vector material designed with singing birds and a cart full of flowers. It is available in AI and EPS formats, including JPG preview.
banner picture
2024-02-29

Golden graduation cap vector material (EPS PNG)

This is a golden graduation cap vector material, available in EPS and PNG formats, including JPG preview.
PNG material
2024-02-27

Home Decor Cleaning and Repair Service Company Website Template

Home Decoration Cleaning and Maintenance Service Company Website Template is a website template download suitable for promotional websites that provide home decoration, cleaning, maintenance and other service organizations. Tip: This template calls the Google font library, and the page may open slowly.
Front-end template
2024-05-09

Fresh color personal resume guide page template

Fresh color matching personal job application resume guide page template is a personal job search resume work display guide page web template download suitable for fresh color matching style. Tip: This template calls the Google font library, and the page may open slowly.
Front-end template
2024-02-29

Designer Creative Job Resume Web Template

Designer Creative Job Resume Web Template is a downloadable web template for personal job resume display suitable for various designer positions. Tip: This template calls the Google font library, and the page may open slowly.
Front-end template
2024-02-28

Modern engineering construction company website template

The modern engineering and construction company website template is a downloadable website template suitable for promotion of the engineering and construction service industry. Tip: This template calls the Google font library, and the page may open slowly.
Front-end template
2024-02-28