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Article Introduction：PHP uses both session and cookie to save the implementation code of user login information, sessioncookie. PHP uses both session and cookie to save the implementation code of user login information. sessioncookie 1. User login status operation class UserLogin phpfinal class UserLogin { public function __cons

2016-07-12 comment 0  939

Article Introduction：[PHP source code reading] count function, PHP source code count function. [PHP source code reading] count function, php source code count function In PHP programming, when traversing an array, it is often necessary to first calculate the length of the array as a judgment condition for the end of the loop. In PHP, when facing

2016-07-12 comment 0  1216

Article Introduction：Core points PHP provides predefined constants and magic methods to enhance code functionality. Predefined constants provide read-only information about code and PHP, while magic methods are names reserved in the class to enable special PHP features. Predefined constants (all capital letters enclosed with double underscores) provide information about the code. Examples include __LINE__ (returns the line number in the source file), __FILE__ (represents the file name, including its full path), __DIR__ (represents the file path only), __CLASS__ (returns the name of the current class), __FUNCTION__ (returns the name of the current function), __METHOD__ (represents the name of the current method), and

2025-02-28 comment 0  1183

Article Introduction：To get the first day of a certain month, it can be implemented through PHP built-in functions. The core methods include: 1. Use the date() function to directly construct the string of the first day of the current month; 2. Use strtotime() to obtain the timestamp; 3. Use the specified date to calculate the first day of the month; 4. Use the DateTime class for object-oriented style processing. In addition, attention should be paid to time zone settings, formatted output and application in database queries. These methods are flexible and suitable for different scenarios, the key is to choose the right approach according to your needs and pay attention to details such as time zone and format control.

2025-07-05 comment 0  528

Article Introduction：To get the current date is the day of the year, it can be implemented through PHP's date() function with the format character 'z'. 1. Use date('z') to directly obtain the day of the year. The return value starts from 0, so 1 is required to add to the actual number of days; 2. If you need to process the specified date, you can calculate it in combination with strtotime() or DateTime class passing date parameters; 3. date('z') has automatically considered the impact of leap years and does not require manual adjustment; 4. It is recommended to use DateTime for object-oriented scenarios to facilitate expansion and maintenance.

2025-07-13 comment 0  217

Article Introduction：Have an in-depth understanding of the count function of PHP arrays and an in-depth understanding of count. In-depth understanding of the count function of PHP arrays, and an in-depth understanding of count count(). The PHP count() function is used to calculate the number of units in an array or the number of attributes in an object, and returns the number of units in the array or the number of pairs.

2016-07-06 comment 0  1266

Article Introduction：Have an in-depth understanding of the count function of PHP arrays and an in-depth understanding of count. In-depth understanding of the count function of PHP arrays, and an in-depth understanding of count count(). The PHP count() function is used to calculate the number of units in an array or the number of attributes in an object, and returns the number of units in the array or the number of pairs.

2016-07-12 comment 0  952

Article Introduction：It is recommended to use the DateTime class for PHP processing date and time. 1. Use the DateTime class to replace old functions, with clear structure and support time zone settings; 2. Use DateTime to manage time and specify the target time zone before output; 3. Use DateInterval to calculate the time difference and obtain complete information such as year, month, and day; 4. Pay attention to avoid the influence of mixed use of date() functions, hard-coded time strings and daylight saving time.

2025-07-09 comment 0  293

Article Introduction：Have an in-depth understanding of the count function in PHP and an in-depth understanding of phpcount. In-depth understanding of the count function in PHP, in-depth understanding of phpcount In PHP programming, when traversing an array, it is often necessary to first calculate the length of the array as a judgment condition for the end of the loop, and in PHP

2016-07-12 comment 0  1340

Article Introduction：To find the date of the next specified day of the week, you can use PHP's DateTime class or strtotime function to implement it. It is recommended to use the DateTime class, such as $nextWednesday=newDateTime('nextWednesday') to get the next Wednesday; if you need to include today, use 'Wednesdaythisweek' as a parameter; you can flexibly control the time range by passing in strings like 'nextMonday', 'Mondaythisweek', and 'Mondaynextweek'; if you use the strtotime function, you can use $timestamp=strtoti

2025-07-12 comment 0  617

Article Introduction：JavaScript's Built-In Capabilities for Generating RangesIn PHP, the range() function is used to generate an array of values within specified...

2024-12-10 comment 0  1097

Article Introduction：In PHP, there are two main methods: one is to use the DateTime class, and the other is to use the strtotime() function. 1. Use the DateTime class to be used for PHP5.3 and above, especially the DateTime::createFromFormat() method to parse strings in the specified format, such as $date=DateTime::createFromFormat('Y-m-d','2024-04-05'); 2. Use the strtotime() function to be suitable for processing natural language formats, such as strtotime("nextFriday"), but it is based on

2025-07-07 comment 0  625

Article Introduction：This article provides methods to determine the location of the active php.ini file utilized by PHP scripts. It explains how to use the php --ini command and the phpinfo() function for webserver SAPIs to retrieve this information, facilitating the man

2024-10-24 comment 0  821

Article Introduction：Use the "GotoAnything" function of SublimeText to quickly jump to a specific file. The main shortcut keys are Ctrl P (Windows/Linux) or Cmd P (Mac). Enter some file names to fuzzy match and open the file; 1. Use the @ symbol to jump through function or class name within the file; 2. Use: Added line numbers to jump directly to the specified line, suitable for debugging and error positioning.

2025-06-12 comment 0  822

Article Introduction：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.

2025-07-06 comment 0  209

Article Introduction：This article provides methods to calculate a user's age based on their date of birth stored in an SQL database. It discusses PHP calculations using the DateTime and date_diff functions, and MySQL calculations using the TIMESTAMPDIFF() function. The m

2024-10-24 comment 0  410

Article Introduction：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.

2025-07-04 comment 0  595

Article Introduction：substr_replace is a function in PHP to replace the contents of the specified position in a string. Its syntax is substr_replace($string,$replace,$start,$length), where $start represents the start position and $length is an optional parameter that represents the replacement length. For example, substr_replace("Helloworld!","PHP", 6, 5) output HelloPHP! Common uses include: 1. Replace the content of the specified location, such as replacing "sunny" with "rainy&quo

2025-07-11 comment 0  879

Article Introduction：MySQL's LAST_DAY() function is used to return the last day of the month where the specified date is. For example, inputting '2024-03-15' will return '2024-03-31'; common uses include: 1. Use DAY() function to calculate the total number of days in a certain month. For example, SELECTDAY(LAST_DAY('2024-02-01')) to determine that there are 29 days in February 2024; 2. Filter the records of the date field as the last day of the month in the query, such as WHEREorder_date=LAST_DAY(order_date); 3. Note that the input must be in a legal date format, otherwise NULL will be returned, and data validity must be ensured or ISNOTNU is used.

2025-07-15 comment 0  561

Article Introduction：In PHP, you can use the array_product function to calculate the product of all elements in an array. 1) It efficiently processes large data sets and is suitable for calculating portfolio returns and statistical product. 2) Pay attention to the data type, non-numeric elements will be converted to 0. 3) The product of large numbers will be converted to floating point numbers, which may affect the accuracy. 4) For large arrays, the performance is acceptable, but other methods need to be considered when calculating frequently. 5) In financial analysis, it can be used to calculate the total product of percentages.

2025-05-20 comment 0  1228