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  • How do I use caching to improve the performance of PHP applications?
    How do I use caching to improve the performance of PHP applications?
    Using caching is one of the most effective ways to improve the performance of PHP applications, which reduces server load and speeds up response time by avoiding duplicate and expensive operations. 1. Enable OPcache for opcode cache, store precompiled script bytecode in memory, set opcache.enable to On, and enable CLI cache and adjust memory consumption as needed; 2. Cache database query results, use tools such as APCu, Memcached or Redis to temporarily store infrequently, and set appropriate TTL according to the data update frequency; 3. Implement page or fragment cache, store static HTML content and quickly return based on unique keys to reduce duplicate processing; 4. Use HTTP cache headers such as Cache
    PHP Tutorial . Backend Development 400 2025-06-20 01:01:31
  • What is JIT (Just-In-Time) compilation in PHP 8?
    What is JIT (Just-In-Time) compilation in PHP 8?
    JITinPHP8improvesperformancebycompilingfrequentlyexecutedcodeintomachinecodeatruntime.Insteadofinterpretingopcodeseachtime,JITidentifieshotsectionsofcode,compilesthemintonativemachinecode,cachesitforreuse,andreducesinterpretationoverhead.Ithelpsmosti
    PHP Tutorial . Backend Development 563 2025-06-20 00:57:51
  • How do I use while loops to repeat code as long as a condition is true?
    How do I use while loops to repeat code as long as a condition is true?
    In programming, a while loop is used to repeatedly execute a block of code, as long as the specified condition is true. Its basic structure is to judge the conditions first and then execute the code. For example, printing codes from 1 to 5 will gradually change the conditions through i = 1 to avoid infinite loops. Key points include: ① The statements that can change the conditions must be included to prevent the dead loop; ② Ensure that the logic is correct and the conditions eventually become false; ③ During debugging, you can assist in the inspection by printing information or setting an exit mechanism. While loops are suitable for handling unknown times, such as user input verification and listening for state changes, such as continuously prompting the user to enter a positive number until the condition is met, or listening for running status in the game to decide whether to continue the loop. The key to mastering the while loop lies in reasonably controlling the exit conditions to avoid program stuck.
    PHP Tutorial . Backend Development 602 2025-06-20 00:54:31
  • How do I use namespaces to organize PHP code?
    How do I use namespaces to organize PHP code?
    NamespacesinPHPareusedtoorganizecodeandpreventnamingconflicts.Theyactlikefolders,allowingthesameclassorfunctionnametoexistindifferentnamespaceswithoutcollision.Keybenefitsincludeavoidingnamingissues,improvingcodereadability,andaligningwithPSRstandard
    PHP Tutorial . Backend Development 867 2025-06-20 00:51:02
  • What are PHP tags (), and why are they used?
    What are PHP tags (), and why are they used?
    PHP tag() is a tag that the server recognizes PHP code. Its core function is to tell the server that "this area is PHP code, it must be executed first and then output to the browser." 1. They are used to embed dynamic content into HTML; 2. Support conditional rendering and data looping; 3. It helps to separate logic from the interface to a certain extent; 4. It is often used to generate dynamic HTML, process forms, include files, set sessions and other scenarios. When using it, you should be careful to avoid errors caused by missing closed tags, short tag compatibility and whitespace characters after closed tags.
    PHP Tutorial . Backend Development 1017 2025-06-20 00:50:30
  • How do I handle fatal errors in PHP?
    How do I handle fatal errors in PHP?
    To handle fatal errors in PHP, it is first necessary to clarify that enabling error reporting and monitoring logs is the key. Secondly, check whether the automatic loading and dependency are correct, such as updating Composer automatic loading, verifying class names and namespaces, and avoiding manual introduction of files; in addition, using the closing function to record fatal error information can improve debug visibility; finally, all errors are displayed during development, and the production environment should record error logs to ensure safety and stability.
    PHP Tutorial . Backend Development 909 2025-06-20 00:40:22
  • What are operators in PHP (arithmetic, assignment, comparison, logical, increment/decrement)?
    What are operators in PHP (arithmetic, assignment, comparison, logical, increment/decrement)?
    PHP operators are symbols or keywords that perform operations. They are divided into five categories according to their functions: arithmetic, assignment, comparison, logic, and increment/decrement. 1. Arithmetic operators are used to add, subtract, multiplication and division, and obtain balance, such as , -, *, /, %; 2. Assignment operators include = and composite forms =, -=, etc., which are used to store or update variable values; 3. Comparison operators such as ==, ==, >,
    PHP Tutorial . Backend Development 956 2025-06-20 00:29:51
  • How do I create custom exception classes in PHP?
    How do I create custom exception classes in PHP?
    Yes,creatingcustomexceptionclassesinPHPenhanceserrorhandlingbyofferingspecificityandorganization.Customexceptionsallowdeveloperstocategorizeerrors,makingdebuggingandloggingmoreefficient.Forexample,ApiExceptionorValidationExceptioncanrepresentdistinct
    PHP Tutorial . Backend Development 657 2025-06-20 00:16:02
  • What are abstract classes and methods in PHP?
    What are abstract classes and methods in PHP?
    Abstract classes and methods are used in PHP to build object-oriented programming structures that define the blueprints that other classes must follow. Abstract classes cannot be instantiated directly, they can only be inherited, and can contain ordinary methods and abstract methods; abstract methods only define method names and parameters, and there is no concrete implementation. Subclasses must implement all abstract methods. Use abstract classes to force consistency, avoid duplicate code and optimize design. For example, the payment method class can define an abstract process() method, and different payment types can be implemented on demand. Key rules include: classes containing abstract methods must be declared as abstract classes, abstract classes cannot coexist with finals, and interfaces are stricter and have no implementation.
    PHP Tutorial . Backend Development 424 2025-06-20 00:06:10
  • How to use the spread operator in PHP?
    How to use the spread operator in PHP?
    PHP does not have extension operators like JavaScript, but can use the splat operator (...) and array_merge() functions to achieve similar functions. 1. Use the splat operator to unpack the array when the function is called, and pass the array elements as independent parameters to the function; 2. Use the splat operation to match the array (PHP7.4) in the array declaration to dynamically build the array; 3. Use the array_merge() function to merge the associative array, and subsequent values ??will overwrite the previous value of the key of the same name, and the numeric keys will be re-indexed; 4. Note that the splat operator must be the last parameter when used in function definition, and cannot achieve the same effect as object extension in the associative array. These
    PHP Tutorial . Backend Development 772 2025-06-19 18:57:11
  • What are constructor property promotion in PHP 8?
    What are constructor property promotion in PHP 8?
    ConstructorpropertypromotioninPHP8allowsautomaticcreationandassignmentofclasspropertiesdirectlyfromconstructorparameters.Insteadofmanuallyassigningeachpropertyinsidetheconstructor,developerscanaddanaccessmodifier(public,protected,orprivate)totheparam
    PHP Tutorial . Backend Development 189 2025-06-19 18:45:11
  • What is a PHP interpreter, and how does it work?
    What is a PHP interpreter, and how does it work?
    ThePHPinterpreterprocessesPHPcodeintoexecutableinstructionsthroughparsing,compilation,andexecution.1)Itfirstparsesthecodeforsyntaxerrors,2)thencompilesvalidcodeintoopcode,and3)finallyexecutestheopcodetogeneratedynamicoutputlikeHTML.Whenintegratedwith
    PHP Tutorial . Backend Development 795 2025-06-19 18:29:10
  • How do I fetch data from a result set using mysqli_fetch_assoc() or PDO::fetch()?
    How do I fetch data from a result set using mysqli_fetch_assoc() or PDO::fetch()?
    The main difference between mysqli_fetch_assoc() and PDO::fetch() is its extension and functional flexibility. 1.mysqli_fetch_assoc() is part of the mysqli extension, and only supports MySQL databases, and the return result is an associative array; 2.PDO::fetch() is a more general PDO extension, supports multiple databases, and can set the return type such as associative array (PDO::FETCH_ASSOC), numeric array (PDO::FETCH_NUM) or object (PDO::FETCH_OBJ); 3. When using mysqli, you need to manually release the result set, and PDO will exceed the statement object.
    PHP Tutorial . Backend Development 1022 2025-06-19 18:21:11
  • What are named arguments in PHP 8?
    What are named arguments in PHP 8?
    NamedargumentsinPHP8allowpassingvaluestoafunctionbyspecifyingtheparameternameinsteadofrelyingonparameterorder.1.Theyimprovecodereadabilitybymakingfunctioncallsself-documenting,asseeninexampleslikeresizeImage(width:100,height:50,preserveRatio:true,ups
    PHP Tutorial . Backend Development 562 2025-06-19 18:05:11

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