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  • how to create a php array of objects
    how to create a php array of objects
    There are three ways to create an array of objects in PHP: manually create, construct from database or API data, and use anonymous classes. First, manually create a small amount of fixed data, such as instantiating multiple objects with a class and storing them into an array; second, after obtaining a two-dimensional array from an external data source such as a database or API, convert each piece of data into an object and add it to the array through a loop; finally, for temporary purposes, anonymous classes can be used to quickly generate object arrays, but they are not suitable for complex projects. Selecting the appropriate method according to the actual scene allows you to flexibly create object arrays.
    PHP Tutorial . Backend Development 520 2025-07-06 02:45:41
  • How do union types work in PHP 8 function parameters?
    How do union types work in PHP 8 function parameters?
    PHP8 introduces union types to support native syntax, allowing function parameters to accept multiple types. 1. Use the "|" symbol to define union types, such as int|string; 2. Supports primitive types, objects and nullable types without additional tags; 3. It is often used to flexibly input while maintaining type safety, such as processing user IDs or optional values; 4. Pay attention to the order of type checking, avoid duplicate types, and do not support PHP8.0 return types. Union types improve code clarity, but still have limitations.
    PHP Tutorial . Backend Development 659 2025-07-06 02:45:00
  • How to mock a global function for PHPUnit testing?
    How to mock a global function for PHPUnit testing?
    PHPUnit does not support direct mock global functions, but can be implemented through namespace tricks or third-party libraries. 1. Use namespace to redefine the function of the same name in the test file to overwrite the original function; 2. Use tools such as BrainMonkey or FunctionMocker to simplify the mock process; 3. The best practice is to encapsulate global functions into the class and manage through dependency injection to improve code testability and maintainability.
    PHP Tutorial . Backend Development 947 2025-07-06 02:44:20
  • How to pass a closure to a function in PHP?
    How to pass a closure to a function in PHP?
    There are four methods to pass closures in PHP. 1. Use Closure type prompts to ensure that the parameters are closures. Examples: functionrun(Closure$callback){$callback();}; 2. Pass the closure directly as a parameter, such as array_map(function($item){return$item*2;},[1,2,3]); 3. Assign the closure to the variable and then pass it to improve the code clarity and reusability; 4. Dynamically create and pass closures, suitable for advanced scenarios such as plug-in systems.
    PHP Tutorial . Backend Development 260 2025-07-06 02:42:20
  • php get number of weeks in a month
    php get number of weeks in a month
    The number of weeks in a certain month can be obtained through PHP calculation. First, determine the day of the week of the month, and then calculate the number of weeks based on the total number of days. The formula is: ceil((total number of days of week-1)/7); if a week starts from Sunday, the calculation logic needs to be adjusted. 1. Use date() to get the number of weeks corresponding to the first day of each month; 2. Use cal_days_in_month() to get the total number of days in the month; 3. Use formulas to calculate the number of weeks. For example, January and October 2023 have 6 weeks, because the first day is Sunday and has 31 days. In actual application, we should clarify the starting date of the week, consider whether the framework provides date categories, and deal with situations across monthly and weekly.
    PHP Tutorial . Backend Development 601 2025-07-06 02:42:00
  • What is the purpose of the use keyword with PHP closures?
    What is the purpose of the use keyword with PHP closures?
    TheusekeywordinPHPallowsaclosuretoaccessvariablesfromitsparentscope.Bydefault,closurescannotaccessexternalvariables,butuseimportsthemasread-onlycopiesatthetimetheclosureisdefined,forexample:$sayHi=function()use($greeting){echo$greeting;};.Multiplevar
    PHP Tutorial . Backend Development 224 2025-07-06 02:40:00
  • php get all dates between two dates
    php get all dates between two dates
    To get all dates between two dates, it is not difficult to implement with PHP. Just pay attention to the time format and loop logic, and it can be easily done. Generate date list using the DateTime class PHP's built-in DateTime class is a good tool for handling dates. We can use it to iterate through every day between the start date and the end date. functiongetDatesBetween($start,$end){$dates=[];$current=newDateTime($start);$end=newDateTime($end);whi
    PHP Tutorial . Backend Development 377 2025-07-06 02:38:20
  • php get age in years months days
    php get age in years months days
    To accurately calculate age and format output, it is recommended to use PHP's DateTime and DateInterval classes. 1. Use the DateTime object to represent the date of birth and the current date; 2. Call the diff method to obtain the date difference, and automatically process the leap year and the days of different months; 3. Get the year, month and day through the $interval->y, $m, and $d attributes; 4. Avoid manually calculating the timestamp, which is prone to errors; 5. You can optimize the output format based on the remaining days and add humanized prompts; 6. The final output results are similar to "34 years, 2 months and 10 days" or "You are 34 years old this year, and you will be 35 years old in 15 days."
    PHP Tutorial . Backend Development 693 2025-07-06 02:36:50
  • php get time in milliseconds
    php get time in milliseconds
    There are three ways to obtain millisecond-level timestamps in PHP: one is to use the microtime() function to return a floating point number and multiply it by 1000 to round it. The second is to combine the hrtime() function to be suitable for high-precision scenarios. The third is to choose a suitable method according to needs and pay attention to system accuracy limitations. Specifically, microtime(true)*1000 can be converted into a millisecond time stamp, suitable for general purposes; hrtime() can provide higher accuracy and is suitable for performance analysis; and practical applications include scenarios such as logging, performance testing, unique ID generation and current limit control. It should be noted that the accuracy may be different under different systems, such as Windows' accuracy is usually lower than Linux.
    PHP Tutorial . Backend Development 876 2025-07-06 02:33:30
  • php subtract days from date
    php subtract days from date
    Subtracting the number of days from dates in PHP can be achieved by strtotime() and DateTime classes. Use strtotime() to operate directly through strings, such as date("Y-m-d",strtotime("-3days",strtotime($date))); the recommended DateTime class is clearer and maintainable, supporting time zones and complex logic, such as $date->modify("-3days") or $date->sub(newDateInterval('P3D')). Notes include:
    PHP Tutorial . Backend Development 396 2025-07-06 02:29:21
  • What are PHP's magic methods like __call and __invoke?
    What are PHP's magic methods like __call and __invoke?
    __call is used to handle undefined or inaccessible method calls, suitable for creating smooth interfaces, proxy classes, or method fallbacks; __invoke allows objects to be called like functions, suitable for writing callable objects or middleware processors that can maintain state; other commonly used magic methods include __get/__set, __callStatic, __isset/__unset and __sleep/__wakeup, which together help build more flexible and dynamic PHP classes.
    PHP Tutorial . Backend Development 827 2025-07-06 02:24:51
  • how to get unique values from a php array
    how to get unique values from a php array
    The array_unique() function can be used to get unique values ??in a PHP array, using loose comparisons by default and retaining the first occurrence of key names. 1. Use array_unique($array) to deduplicate directly, but do not distinguish types by default, such as "1" and 1 are considered the same; 2. Adding the second parameter SORT_REGULAR can enable strict comparison; 3. The function retains the original key name by default and only removes duplicate values; 4. Deduplication logic can be manually implemented to support more complex scenarios, such as traversing the array and using in_array($value,$seen,true) for strict judgment.
    PHP Tutorial . Backend Development 463 2025-07-06 02:24:10
  • php date comparison with null
    php date comparison with null
    When processing date comparisons containing NULL in PHP, you must first clarify that NULL means "not set" or "unknown time", and cannot be compared directly with other dates. 1. Determine whether the variable is NULL and avoid using the comparison operator directly; 2. Decide to treat NULL as "early" or "late" based on business logic; 3. Convert it to timestamps for safe comparison; 4. Default values ??can be set through SQL or PHP to avoid NULL; 5. It is recommended that encapsulation functions handle such logic uniformly.
    PHP Tutorial . Backend Development 575 2025-07-06 02:20:21
  • What is tail-call optimization and does PHP support it for recursive functions?
    What is tail-call optimization and does PHP support it for recursive functions?
    Yes,PHPdoesnotsupporttail-calloptimization(TCO).1.TCOisatechniquewherethecompilerorinterpreteravoidsaddingnewstackframesfortailcalls,crucialforefficientrecursion.2.PHPlacksthisfeature,soeventail-recursivefunctionsaddstackframes,riskingstackoverflowon
    PHP Tutorial . Backend Development 919 2025-07-06 02:17:11

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