current location：Home > Technical Articles > Daily Programming > PHP Knowledge
- Direction：
- All web3.0 Backend Development Web Front-end Database Operation and Maintenance Development Tools PHP Framework Daily Programming WeChat Applet Common Problem Other Tech CMS Tutorial Java System Tutorial Computer Tutorials Hardware Tutorial Mobile Tutorial Software Tutorial Mobile Game Tutorial
- Classify：
- PHP tutorial MySQL Tutorial HTML Tutorial CSS Tutorial
-
- PHP check if a string ends with a specific string
- There are three ways to determine whether a string ends with a specific substring in PHP. First, PHP8.0 and above can directly use the str_ends_with() function, which is simple and efficient. Secondly, PHP7 and below can be implemented through substr() combined with strlen() to ensure that there will be no errors when processing empty strings; finally, the regular expression preg_match() can also be used, but due to performance and complexity issues, it is recommended to use only when there is regular logic.
- PHP Tutorial . Backend Development 376 2025-07-14 00:45:41
-
- What is function currying in PHP?
- CurryinginPHPisatechniquewhereafunctionwithmultipleargumentsistransformedintoasequenceoffunctionseachtakingasingleargument.1)ItusesclosurestosimulatecurryingsincePHPlacksbuilt-insupport.2)Example:add(5)returnsanewfunctionthattakes3,resultingin8.3)Ith
- PHP Tutorial . Backend Development 557 2025-07-14 00:43:01
-
- PHP find where output started before header
- When encountering the "Cannotmodifyheaderinformation–headersalreadysent" error, you should first find the location where the output starts, and then check and clear the excess output source. The specific steps are as follows: 1. Position the output starting file and line number according to the error message; 2. Check whether there are echo, print and other output statements or HTML content in front and behind this location; 3. Check whether there are blank characters or closed tags at the beginning and end of the PHP file?>; 4. Use ob_start() to temporarily buffer the output to debug the code; 5. Troubleshoot hidden output sources such as imported files, UTF-8BOM header and php.ini configuration.
- PHP Tutorial . Backend Development 905 2025-07-14 00:09:30
-
- How to get the current session ID in PHP?
- The method to get the current session ID in PHP is to use the session_id() function, but you must call session_start() to successfully obtain it. 1. Call session_start() to start the session; 2. Use session_id() to read the session ID and output a string similar to abc123def456ghi789; 3. If the return is empty, check whether session_start() is missing, whether the user accesses for the first time, or whether the session is destroyed; 4. The session ID can be used for logging, security verification and cross-request communication, but security needs to be paid attention to. Make sure that the session is correctly enabled and the ID can be obtained successfully.
- PHP Tutorial . Backend Development 1062 2025-07-13 03:02:31
-
- how to find a key by its value in a php array
- There are three ways to find the corresponding keys of an array based on values in PHP: 1. Use the array_search function to directly find the first matching key, and return false if not found; 2. If there are multiple same values, you need to traverse the array custom function to obtain all matching keys; 3. Use the array_keys function and pass in the value parameter to return all matching keys at once. Note that array_search uses loose comparison by default. It is necessary to pass true to enable strict comparison. If it returns false, it means that it is not found. Be extra careful when judging.
- PHP Tutorial . Backend Development 940 2025-07-13 03:01:51
-
- what are the advantages of using a php framework
- There are four main benefits of using PHP framework: improving development efficiency, unifying code structure, enhancing security, and providing community support. 1. The framework provides tools such as ORM, routing management, template engine, etc. to reduce duplicate labor and improve development speed; 2. Forced and standardized code structure and naming rules to facilitate team collaboration and maintenance; 3. Built-in security mechanisms such as SQL injection protection, XSS filtering, and CSRF protection to improve application security; 4. The mainstream framework has an active community and complete documents to facilitate problem solving and learning and use. Overall, although learning costs are required in the early stage, the efficiency, security and maintainability brought by the framework make it an indispensable development tool for medium and large projects.
- PHP Tutorial . Backend Development 1038 2025-07-13 03:01:30
-
- PHP get substring from a string
- To extract substrings from PHP strings, you can use the substr() function, which is syntax substr(string$string,int$start,?int$length=null), and if the length is not specified, it will be intercepted to the end; when processing multi-byte characters such as Chinese, you should use the mb_substr() function to avoid garbled code; if you need to intercept the string according to a specific separator, you can use exploit() or combine strpos() and substr() to implement it, such as extracting file name extensions or domain names.
- PHP Tutorial . Backend Development 578 2025-07-13 02:59:51
-
- Can I store an object or an array in a PHP session?
- Yes,youcanstorebothobjectsandarraysinaPHPsession.Tostoreanarray,assignittoa$_SESSIONkey,suchas$_SESSION['user_preferences']=['theme'=>'dark','notifications'=>true,'language'=>'en'];,andaccessitlaterusing$_SESSION['user_preferences']['languag
- PHP Tutorial . Backend Development 504 2025-07-13 02:59:31
-
- How to split a string into an array in PHP
- In PHP, the most common method is to split the string into an array using the exploit() function. This function divides the string into multiple parts through the specified delimiter and returns an array. The syntax is exploit(separator, string, limit), where separator is the separator, string is the original string, and limit is an optional parameter to control the maximum number of segments. For example $str="apple,banana,orange";$arr=explode(",",$str); The result is ["apple","bana
- PHP Tutorial . Backend Development 193 2025-07-13 02:59:10
-
- How to store PHP sessions in a database?
- Store PHP sessions in the database to improve performance and facilitate management, especially in multi-server environments to realize session sharing. 1. Create a session table structure, including session_id, session_data and last_accessed fields; 2. Implement open(), close(), read($id), write($id, $data), destroy($id) and gc($max_lifetime) methods in the SessionHandlerInterface interface; 3. Register a custom handler and start the session; 4. Pay attention to locking mechanism, performance optimization, cleaning policies and security issues. By this
- PHP Tutorial . Backend Development 739 2025-07-13 02:56:41
-
- How do you perform unit testing for php code?
- UnittestinginPHPinvolvesverifyingindividualcodeunitslikefunctionsormethodstocatchbugsearlyandensurereliablerefactoring.1)SetupPHPUnitviaComposer,createatestdirectory,andconfigureautoloadandphpunit.xml.2)Writetestcasesfollowingthearrange-act-assertpat
- PHP Tutorial . Backend Development 993 2025-07-13 02:54:31
-
- How do PHP sessions work with AJAX requests?
- PHPsessionsworkwithAJAXrequestssimilarlytoregularpagerequestsbutrequireattentiontopersistence,blocking,andcross-domainissues.1.SessionsstartandpersistviathePHPSESSIDcookie,whichbrowsersautomaticallysendwithAJAXrequestsaslongassession_start()iscalledi
- PHP Tutorial . Backend Development 508 2025-07-13 02:53:50
-
- Describe the Concept of CSRF and How to Protect Against it in PHP
- CSRF attacks are used to fake requests using the user's logged in identity. Specifically, the attacker induces users to access malicious websites, sends requests in the user's name without the user's knowledge, and performs non-intentional operations. A common way to prevent CSRF is to use the CSRFTToken mechanism, 1. Generate a unique random token; 2. Save the token in the Session and form hidden fields; 3. Compare whether the two are consistent when submitting. Other protection methods include checking the Referer header, setting the SameSiteCookie attribute, and introducing a verification code mechanism. Easy to ignore points include AJAX request not token, token generation is unsafe, and token storage into cookies incorrectly. The correct way is to only
- PHP Tutorial . Backend Development 336 2025-07-13 02:53:31
-
- How to use PHP sessions with a different domain or cross-domain?
- The answer is: PHP native session is only available for single domain names by default, but can be shared across domains through manual intervention. 1. Explicitly pass the sessionID, pass it through URL parameters or custom header and set session_id in the target domain name; 2. Share the session storage backend, such as using Redis, Memcached or NFS shared directory; 3. Set the domain attribute of the cookie to be suitable for subdomain sharing; 4. Use advanced solutions such as OAuth, JWT or SSO to replace the direct sharing session to improve security and scalability. The above methods need to be combined with HTTPS and security control to prevent risks.
- PHP Tutorial . Backend Development 411 2025-07-13 02:46:11
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.
Player special effects
2024-02-29
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
