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- How to get the name of the current function in PHP?
- There are three methods to obtain the current execution function name in PHP: 1.\_\_FUNCTION\_\_The name of the magic constant when returning the function definition is suitable for ordinary functions; 2.\_\_METHOD\_\_ is used to return "class name:: method name" in class methods, which can extract the method name through string processing; 3.debug\_backtrace() can dynamically obtain the call stack information to obtain the current execution function name but the performance is low, and it is recommended to be used in debugging scenarios. \_\_FUNCTION\_\_ and \_\_METHOD\_ are simpler and more efficient in their respective contexts and debug\_backtrace() provides a more flexible but heavier solution.
- PHP Tutorial . Backend Development 199 2025-07-06 00:27:31
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- php get week number from date
- Getting the number of weeks corresponding to dates in PHP can be achieved through built-in functions. The main methods are: 1. Use the date() function to match the 'W' format character to obtain the ISO-8601 standard number of weeks, such as $weekNumber=date('W',strtotime('2025-04-05')); 2. Use the DateTime class to process the time and time zone more flexibly, such as $date=newDateTime('2025-04-05'), $weekNumber=$date->format('W'); 3. Custom logic adapts to the differences in weekly start dates in different regions. If the weekly start date is set to Sunday, the date calculation needs to be manually adjusted. Note the return value
- PHP Tutorial . Backend Development 825 2025-07-06 00:06:30
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- php get unix timestamp from date
- Getting the Unix timestamp corresponding to dates in PHP can be implemented in a variety of ways. Common methods include: 1. Use the strtotime() function to apply to date strings in common formats, which are concise but sensitive to formats; 2. Use DateTime::createFromFormat() is more suitable for parsing date strings in fixed specific formats to improve accuracy; 3. When processing dates with time zone information, you can use the DateTime class to combine getTimestamp() or strtotime() to parse the time zone, and the time zone can be adjusted uniformly. Select the appropriate method according to the scene and pay attention to input verification to avoid errors.
- PHP Tutorial . Backend Development 188 2025-07-05 02:49:31
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- how to add element to php array
- There are several ways to add elements to an array in PHP: 1. Append elements at the end of the array using square brackets [] to automatically assign the next numerical index; 2. Use the array_push() function to add multiple elements to the end at once, and directly modify the original array; 3. Add elements with the key name, insert new elements into custom key positions, and existing keys will be overwritten; 4. Use array_unshift() to add elements at the beginning of the array and automatically reorder the numerical index. These methods are applicable to different scenarios depending on the addition position, key name control and operation methods, and it is necessary to note that some functions will directly modify the characteristics of the original array.
- PHP Tutorial . Backend Development 511 2025-07-05 02:49:11
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- how to group a php array by a key
- In PHP, key-value grouping can be implemented by traversing the array and specifying key classification. Specific methods include: 1. Use a foreach loop to manually group, build a two-dimensional array by traversing array elements and using the target key value as new keys; 2. Encapsulate the logic into a groupByKey function to improve reusability and maintainability; 3. Use the array_reduce function to achieve a more compact writing method, although the code is concise, it is less readable. Either way, the core idea is to classify data with the specified key as the identifier and ensure that the target key exists to avoid errors.
- PHP Tutorial . Backend Development 528 2025-07-05 02:47:41
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- How to set a default value for a PHP function parameter?
- TosetadefaultvalueforaPHPfunctionparameter,assignthevaluedirectlyinthefunctiondefinitionusinganequalssign(=),andensuredefaultsareonlyusedfortrailingparameters.1.Assigndefaultvaluesinline:functiongreet($name="Guest").2.Usenullasaplaceholderw
- PHP Tutorial . Backend Development 672 2025-07-05 02:45:40
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- How to return JSON from a PHP function?
- ToreturnJSONfromaPHPfunction,usejson_encode()toconvertdata,setthecorrectheader,handleerrors,andmanagearray/objectoutputs.1.Usejson_encode()toconvertassociativearraysorobjectsintoaJSONstring.2.SettheContent-Type:application/jsonheaderwhenoutputtingJSO
- PHP Tutorial . Backend Development 714 2025-07-05 02:45:01
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- how to get the number of dimensions in a php array
- PHP itself does not have a function that directly obtains array dimensions, but it can be implemented recursively. To determine whether an array is two-dimensional or higher, you can check whether its elements contain an array; if you need to accurately obtain the dimension number, use the recursive function getArrayDimensions, which returns the maximum nesting level of the array and can correctly handle irregular arrays. In practical applications, it is necessary to pay attention to the performance problems caused by empty arrays returning 1 dimension, mixed type data does not affect judgment, and deep recursion may cause.
- PHP Tutorial . Backend Development 170 2025-07-05 02:44:20
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- php get current timestamp
- There are two ways to get the current timestamp in PHP: 1. Use the time() function, which directly returns the current Unix timestamp, which is efficient and suitable for most scenarios; 2. Use the strtotime() function, and you can also get the current timestamp by passing in "now" or not passing parameters. This method is more flexible and suitable for handling relative time such as "Tomorrow's current moment", but you need to pay attention to errors when dealing with non-standard date formats; In addition, no matter which method is used, it is recommended to set the time zone through date_default_timezone_set() to avoid result deviations and warning problems caused by the server's default time zone.
- PHP Tutorial . Backend Development 284 2025-07-05 02:44:00
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- How to call a PHP function from a variable?
- There are the following methods for calling functions dynamically in PHP: 1. Use variable functions, assign the function name to the variable and then call it through $func(); 2. Dynamically call the instance method through object methods and -> operators, or call static methods through class names and :: operators; 3. Use call_user_func() and call_user_func_array() to flexibly pass parameters and execute them. When using it, you should pay attention to verifying whether the function exists, avoid directly using user input as function name to ensure safety, and language constructs such as echo cannot be used for variable functions. These methods are suitable for building plug-in systems, callback mechanisms, or writing flexible code logic.
- PHP Tutorial . Backend Development 547 2025-07-05 02:43:20
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- php format date with ordinal suffix (st, nd, rd, th)
- Displaying dates with English ordinal numbers in PHP must be implemented through custom logic, because the date() function itself does not support this format; 1st is suitable for 1, 21, 31, 2nd is suitable for 2, 22, 3rd is suitable for 3, 23, and the rest is th; Method 1 can be used to splice suffix through the function format_date_with_suffix, and Method 2 recommends using the Carbon library to automatically support the S format; precautions include avoiding direct use of date('jS'), correct use of quotes, and suggesting using Carbon to deal with complex time problems.
- PHP Tutorial . Backend Development 145 2025-07-05 02:42:20
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- php date immutable vs datetime
- The core difference between DateTime and DateTimeImmutable in PHP is whether it is variable. 1. DateTime is a mutable object. Calling modify(), add() and other methods will directly modify itself; while DateTimeImmutable is an immutable object. Each operation returns a new instance, and the original object remains unchanged. 2. In usage scenarios, DateTimeImmutable is more suitable for avoiding side effects, retaining original values ??or writing functional code, while DateTime is suitable for reducing object creation or frequent modification of the same time point. 3. The APIs of the two are almost the same, but attention should be paid to the behavioral differences of the modification method. Date can be operated through clone.
- PHP Tutorial . Backend Development 1016 2025-07-05 02:42:01
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- php add days to date
- It is recommended to use the DateTime class to add a number of days to dates in PHP, with clear code and flexible functions. The DateTime class introduced in PHP5.2 supports object-oriented operations. The example code is: $date=newDateTime('2024-10-01'); $date->modify('5days'); echo$date->format('Y-m-d'); The output result is 2024-10-06; this method is highly readable and supports time zone setting and formatting output. You can also use strtotime() to implement it, but you need to pay attention to the time zone problem. The example is: $newDate=date("
- PHP Tutorial . Backend Development 771 2025-07-05 02:40:11
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- php preg_match get captured groups
- To use preg_match to get the capture group, you need to circle the target content in brackets in the regular and output the result through the third parameter. 1. The way to write a capture group is to wrap the part you want to extract with (). After matching, the result will be stored in the $matches array, where $matches[0] is a complete match, and $matches[1], $matches[2], etc. correspond to each capture group in sequence; 2. If multiple capture groups are defined using multiple brackets, the corresponding values ??are accessed through the numeric index in sequence; 3. The (?...) syntax can be used to name the capture group, and then the corresponding values ??can be accessed through $matches['name'] to improve the readability of the code; 4. When calling, you should first judge the return of preg_match.
- PHP Tutorial . Backend Development 509 2025-07-05 02:38:30
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