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  • php get last day of month
    php get last day of month
    To get the last day of a certain month, you can use the date() and strtotime() functions or DateTime classes of PHP. 1. Use date() and strtotime(): Get the end date of the month through date('Y-m-t',strtotime('Specified date')), where t represents the number of days of the month; if you get the last day of the current month, the date parameter can be omitted. 2. Use the DateTime class: After creating the DateTime object, use format('Y-m-t') to get the last day, and you can also dynamically adjust the month through modify(). Notes include setting the correct time zone, using standard date formats (such as 'Y-m-d'), and not having to manually handle leap years
    PHP Tutorial . Backend Development 938 2025-07-04 00:50:20
  • how to handle routing in a modern php framework
    how to handle routing in a modern php framework
    The core of handling routing in modern PHP frameworks is to understand the unified entry mechanism and routing configuration method. 1. The basic routing definition maps URLs to controller methods through routes.php or annotations, such as Laravel's Route::get(). It is recommended to centrally manage routes and use named routes to improve maintainability; 2. The routing parameters support dynamic path extraction and verification, such as using where() to limit parameter types to avoid injection risks; 3. Route packets combine middleware to implement permission control and modular management, reduce duplicate code and improve organizational logic capabilities; 4. Resource routing supports RESTful style, automatically creates standard CRUD routes, improve development efficiency and enhance collaboration consistency. Master these common practices
    PHP Tutorial . Backend Development 817 2025-07-04 00:38:11
  • php format duration in hours minutes seconds
    php format duration in hours minutes seconds
    To convert the total number of seconds to the hour:minute:second format, PHP provides two common methods. The first is to use basic mathematical operations: obtain the hours by dividing by 3600, continue to calculate the minutes and seconds after taking the modulus, and finally format the output with sprintf(); the second is to use the DateInterval class to achieve object-oriented formatting with DateTime. If the time length of more than 24 hours is required, it is recommended to calculate the hour part by yourself to avoid the limit of %H to only display the number of hours within the day. For example, 90061 seconds can be converted to 25:01:01. Select the right method according to your needs to complete the conversion.
    PHP Tutorial . Backend Development 595 2025-07-04 00:34:41
  • php regex start of string and end of string anchors
    php regex start of string and end of string anchors
    In PHP regular expressions, use ^ and $ anchors to match the beginning and end of a string respectively. 1.^ means the beginning of the string, ensure that the matching content appears from the beginning, such as /^hello/verifies whether it starts with hello; 2.$ means the end of the string, such as /.jpg$/verifies whether it ends with .jpg; 3. Use ^ and $ in combination to achieve a complete match, such as /^abc\d $/ to ensure that the entire string conforms to the specified format; 4. In multi-line mode, ^ and $ will match the beginning and end of each line respectively; 5. Note that the ending line breaks may affect the matching result, and you can use \s* or trim() to avoid problems. Mastering these details can improve the accuracy of regular expressions.
    PHP Tutorial . Backend Development 474 2025-07-04 00:33:31
  • how to get all values from a php array
    how to get all values from a php array
    The most straightforward way to get all values ??in a PHP array is to use the array_values() function. 1.array_values() can directly extract all values ??in the array and reset the index; 2. This method is suitable for associative arrays and index arrays, which is especially convenient when processing data returned by the database or API; 3. If you need to process each value extra, you can use foreach traversal to extract manually; 4. Note that array_values() does not recursively process multi-dimensional arrays, and will discard the original key name. When using it, you should choose the appropriate method according to your needs.
    PHP Tutorial . Backend Development 857 2025-07-04 00:28:31
  • php get yesterday's date
    php get yesterday's date
    There are three ways to get yesterday's date in PHP: use the strtotime() function, combine the date() function to output detailed time, or use the DateTime class for flexible processing. The first method directly obtains yesterday's date through echodate('Y-m-d',strtotime('yesterday')); the second method can output the full time containing time, minutes and seconds, such as echodate('Y-m-dH:i:s',strtotime('yesterday')); the third method uses the object-oriented DateTime class to facilitate the execution of complex date operations, such as adding and subtracting days or setting time zones, with the code as $date=n
    PHP Tutorial . Backend Development 146 2025-07-04 00:18:51
  • how to get all keys from a php array
    how to get all keys from a php array
    To extract all key names in PHP arrays, the most common method is to use the array_keys() function, which can directly return all keys in the array, suitable for simple arrays. For scenarios where each key needs to be processed, you can use a foreach loop to manually collect the key names, which is more flexible. If you face multi-dimensional arrays, you need to write a recursive function to extract keys at all levels, and you can use array_unique() to deduplicate keys to avoid duplicate keys. Just select the appropriate method according to the complexity of the array.
    PHP Tutorial . Backend Development 276 2025-07-03 10:39:10
  • how to remove an element from a php array
    how to remove an element from a php array
    ToremoveelementsfromaPHParray,usedifferentmethodsbasedonyourneeds.1.Toremovebyvaluewhenthekeyisunknown,usearray_search()withunset().2.Toremovebyknownkey,directlyuseunset().3.Toreindexnumerickeysafterremoval,applyarray_values().4.Toremoveelementsbased
    PHP Tutorial . Backend Development 575 2025-07-03 10:38:11
  • how to fill a php array with a specific value
    how to fill a php array with a specific value
    To quickly fill a PHP array, use the array_fill() function to initialize a fixed-length array and set a default value; for associative arrays, you can combine array_combine() and array_fill() or loop assignments. 1.array_fill(start_index,count,value) is used for index array filling; 2. Associative arrays can be assigned one by one by array_combine($keys,array_fill(...))) or traversal key names; 3. Note that count cannot be a negative number, the fill value can be of any type, but the reference type needs to be modified carefully.
    PHP Tutorial . Backend Development 677 2025-07-03 10:35:21
  • how to dynamically create a multidimensional php array
    how to dynamically create a multidimensional php array
    To dynamically build a multi-dimensional PHP array, you must first clarify the structure, use loops to gradually add data, recursion can be used when processing nested relationships, and pay attention to references, key conflicts and performance issues. 1. Clarify the target array structure, such as a menu containing subitems; 2. Use loop traversal data sources and insert each item into the correct position according to conditions; 3. For deep nested structures, use recursive functions to automatically build the hierarchy; 4. Pay attention to avoid problems such as unrelease of references and repeated overwriting of key names; 5. Consider the performance under large data volume, and use iteration or database grouping when necessary.
    PHP Tutorial . Backend Development 370 2025-07-03 10:35:00
  • What is function composition in PHP?
    What is function composition in PHP?
    FunctioncompositioninPHPinvolvescombiningmultiplefunctionssothattheoutputofonebecomestheinputofanother,enablingcleanerandmoremodularcode.Itisachievedmanuallybynestingfunctionsorusinghelperfunctionslikecompose()todynamicallychainoperations.Librariessu
    PHP Tutorial . Backend Development 612 2025-07-03 10:34:40
  • PHP function argument type hinting
    PHP function argument type hinting
    PHP's function parameter type prompt is a function introduced by PHP5, which is further enhanced in PHP7 and later versions, which can improve code readability and robustness and help development tools to perform automatic completion and error checking. 1. Type prompts By specifying the expected data type to the function parameters, TypeError will be raised when passing in an inappropriate type when called; 2. PHP supports scalar types, composite types, object types, union types (PHP8.0) and nullable types; 3. Pay attention to enabling strict mode, handling null values, inheritance consistency and namespace references when using; 4. It is recommended to use type prompts in new functions, enable strict mode, use IDE to assist detection, and gradually optimize old code.
    PHP Tutorial . Backend Development 179 2025-07-03 10:34:11
  • php regex for password strength
    php regex for password strength
    To determine the strength of the password, it is necessary to combine regular and logical processing. The basic requirements include: 1. The length is no less than 8 digits; 2. At least containing lowercase letters, uppercase letters, and numbers; 3. Special character restrictions can be added; in terms of advanced aspects, continuous duplication of characters and incremental/decreasing sequences need to be avoided, which requires PHP function detection; at the same time, blacklists should be introduced to filter common weak passwords such as password and 123456; finally it is recommended to combine the zxcvbn library to improve the evaluation accuracy.
    PHP Tutorial . Backend Development 480 2025-07-03 10:33:11
  • how to check if a value exists in a php array
    how to check if a value exists in a php array
    To check whether the value exists in the PHP array, the most direct way is to use the in_array() function, which receives the value to be found and the target array as parameters. If found, it returns true, otherwise it returns false; for example: $fruits=['apple','banana','orange'];if(in_array('banana',$fruits)){echo' Found banana! ';}Note that by default in_array() does not distinguish between types. If you need to strictly compare (including types), you can add the third parameter true; 1. To obtain the key name corresponding to the value at the same time, you can use the array_search() function.
    PHP Tutorial . Backend Development 895 2025-07-03 10:32:51

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