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  • Describe the difference between `include`, `require`, `include_once`, and `require_once` in php.
    Describe the difference between `include`, `require`, `include_once`, and `require_once` in php.
    In PHP, the main differences between include, require and their \_once versions are in the error handling method and whether the file is loaded repeatedly. 1. Include issues a warning when the file cannot be found but the script continues to be executed; 2. require throws a fatal error and terminates the script; 3. include\_once and require\_once respectively ensure that the file is loaded only once during the entire script life cycle to avoid repeated definition errors; 4. The selection basis is whether the file must exist and whether it is possible to be repeatedly introduced.
    PHP Tutorial . Backend Development 163 2025-07-11 00:53:51
  • What are PHP prepared statements
    What are PHP prepared statements
    PHP preprocessing statements safely execute queries by separating SQL logic from data. 1. Use placeholders (such as ? or :name) instead of directly embedding user input; 2. bind values ??and then execute to ensure that the input is correctly escaped to prevent SQL injection; 3. Improve performance when executing similar queries multiple times; 4. Make the code clearer and easier to maintain; 5. Common errors include directly splicing user input into SQL, ignoring error handling, and replacing representative names or column names with placeholders.
    PHP Tutorial . Backend Development 1004 2025-07-11 00:45:11
  • php get current time in specific timezone
    php get current time in specific timezone
    To get the current time of the specified time zone, it is recommended to use the DateTime class to cooperate with DateTimeZone. The steps are: 1. Create a DateTimeZone object; 2. Create a DateTime object with the current time and bind the time zone; 3. Format the output time. Common time zones include Asia/Shanghai, Europe/London, etc. You can view the full list through DateTimeZone::listIdentifiers(). If you are used to procedural writing, you can use date_default_timezone_set() to set the default time zone and call date() to output the time, but this method will affect the global time settings. Notice
    PHP Tutorial . Backend Development 608 2025-07-11 00:39:51
  • PHP prepared statement dynamic query
    PHP prepared statement dynamic query
    The following steps are required to construct a query dynamically using PHP preprocessing statements: 1. Collect WHERE conditions and parameters through an array, and flexibly construct the query statement based on the actual passed parameters; 2. Keep the WHERE clause dynamically changing when splicing SQL, and prepare the parameters uniformly; 3. When the number of parameters is greater than 0, call bind_param for binding, pay attention to the same order of the type string and the parameter; 4. Always use parameterized queries to prevent injection, field names or table names need to be whitelisted to verify, and LIKE and NULL values ??should also be handled specially to ensure security and accuracy.
    PHP Tutorial . Backend Development 882 2025-07-11 00:34:02
  • PHP header location not working after form submit
    PHP header location not working after form submit
    Headerlocation jump failure is usually caused by the output being triggered in advance or the logic is not executed to the jump. 1. Make sure there is no output before the header, including spaces, BOM characters and echo/print statements; 2. Check whether the form method and action are correct, and confirm that the logical branch is executed to the jump position; 3. Add exit/die to the header and terminate the subsequent code; 4. Use JS jump temporarily to replace but not recommended solution if necessary. Solve the output, logic and termination statements in order.
    PHP Tutorial . Backend Development 275 2025-07-11 00:33:11
  • PHP header location whitespace before php tag
    PHP header location whitespace before php tag
    The reason and solution for jumping does not take effect or prompting "headersalreadysent" error: 1. The whitespace character at the beginning of the file causes the header to fail, check and delete
    PHP Tutorial . Backend Development 726 2025-07-11 00:31:11
  • PHP sprintf format examples
    PHP sprintf format examples
    The sprintf() function in PHP is used to format strings and return results. 1. Format numbers to be formatted as fixed decimal places, you can use %.2f, %.1f and other formats to automatically round; 2. Complement and width control can be implemented through d or M, indicating complementary or fill spaces respectively; 3. String truncation and splicing use %.10s or .10s to limit length and alignment; 4. When using multiple parameters in a mixed manner, %s, %d, and %f correspond to strings, integers, and floating-point numbers, respectively, and the order must be consistent. This function is very practical in generating logs, reports and other scenarios, making the code more neat and controllable.
    PHP Tutorial . Backend Development 817 2025-07-11 00:27:21
  • PHP session not working on mobile or in some browsers
    PHP session not working on mobile or in some browsers
    PHP session fails on mobile phones or some browsers, mainly due to cookie settings, session ID delivery or cross-domain issues. 1. The SessionID is not saved or passed correctly. If the third-party cookies are disabled, the user disables the cookies or misses the sid, make sure to call session_start() and check the cookie settings. 2. Mobile browser policies are strict. For example, iOSSafari blocks third-party cookies in iframes. Iframes should avoid nesting key processes and unifying domain names. 3. The Session file is not read and written correctly. If the permissions are insufficient or multiple servers are not synchronized, you need to check the log and debug output to confirm consistency. 4. HTTPS
    PHP Tutorial . Backend Development 859 2025-07-11 00:20:21
  • How to use prepared statements with mysqli
    How to use prepared statements with mysqli
    PreparedstatementsinMySQLipreventSQLinjectionandimproveefficiencybyseparatingSQLlogicfromdatainputs.Tousethemeffectively:1)connecttothedatabase,2)preparetheSQLstatementwithplaceholders,3)bindparameterscorrectlybytype(sforstring,iforinteger,etc.),4)ex
    PHP Tutorial . Backend Development 851 2025-07-11 00:17:50
  • How to debug a PHP function?
    How to debug a PHP function?
    The key to debugging PHP functions is to master practical methods and tools. 1. First check whether the input parameters are correct, use var_dump or print_r to print parameter values, and confirm whether the type, format and default values ??are reasonable; 2. Turn on error reports (error_reporting and display_errors), display all error messages, and help position variables undefined and keys, etc.; 3. Segmented testing logic, and determine whether the code execution process and intermediate results are in line with expectations through temporary output or logging; 4. Use debugging tools such as Xdebug to cooperate with IDE to achieve breakpoint debugging, single-step execution, etc. to improve efficiency; 5. Maintain good code specifications to reduce naming confusion or unclear function responsibilities
    PHP Tutorial . Backend Development 300 2025-07-10 13:58:01
  • Explain PHP Exception catching and creating custom exceptions.
    Explain PHP Exception catching and creating custom exceptions.
    In PHP development, catch exceptions and customize exception classes to improve code robustness. 1. Use try to wrap error codes, catch catch and handle exceptions, throw manually exceptions; 2. Custom exception classes inherit Exceptions, such as DatabaseException, PermissionException, and targeted processing; 3. Get detailed error information through getMessage(), getCode(), getFile() and other methods for debugging, but the production environment needs to turn off sensitive output.
    PHP Tutorial . Backend Development 778 2025-07-10 13:57:41
  • PHP preg_match_all to find all matches in a string
    PHP preg_match_all to find all matches in a string
    ToextractalloccurrencesofapatternfromastringinPHP,usethepreg_match_allfunction;itscansthestringwitharegularexpressionandreturnsallmatchesinanarray.1.Thesyntaxispreg_match_all($pattern,$subject,$matches,$flags,$offset),where$patternistheregexwrappedin
    PHP Tutorial . Backend Development 580 2025-07-10 13:51:31
  • What is a 'pure function' and how to write one in PHP?
    What is a 'pure function' and how to write one in PHP?
    Pure functions are concepts in functional programming. They can be implemented in PHP by following specific rules. The core features include: 1. No side effects, no modification of global variables, object states or performing I/O operations; 2. The same input always returns the same output, and does not rely on external data such as time and random numbers; 3. Keep simple and focused, only process inputs and return results, and do not use reference modifications or static variables to retain state. For example, sum(int$a,int$b):int is a typical pure function that only depends on parameters and has no external influence.
    PHP Tutorial . Backend Development 421 2025-07-10 13:51:10
  • How to handle unicode and UTF-8 strings in PHP
    How to handle unicode and UTF-8 strings in PHP
    The following points should be noted when dealing with Unicode and UTF-8 characters in PHP: 1. UTF-8 is used uniformly in all links, including HTML pages, PHP file saving formats and database connections; 2. Use mb_string extension to process multi-byte characters and replace native string functions; 3. Add the JSON_UNESCAPED_UNICODE parameter to maintain UTF-8 output when encoding; 4. Use utf8mb4 character sets in database settings. PHP does not distinguish encoding by default, which can easily lead to garbled code or emoji exceptions. Therefore, it is necessary to ensure UTF-8 consistency from the input to the output, and correctly use relevant extensions and parameters to deal with character encoding issues.
    PHP Tutorial . Backend Development 183 2025-07-10 13:49:10

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