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  • How to use the PHP CLI (Command Line Interface)?
    How to use the PHP CLI (Command Line Interface)?
    The methods to run scripts using PHPCLI include: 1. Make sure that PHP is installed and environment variables are configured, and run phpscript.php to execute scripts; 2. You need to manually add PHP path to environment variables on Windows, and Ubuntu and other systems can install php-cli packages; 3. Common parameters such as -a (interaction mode), -r (execution code), -l (synchronization check), and -S (start the server); 4. Get command line parameters through $argc and $argv, or use getopt() to handle complex options; 5. Actual applications include timing tasks, data import and export, command line tool development and unit testing. After mastering these basic operations, PHPCLI can become an efficient and practical development assistant.
    PHP Tutorial . Backend Development 847 2025-07-09 02:55:01
  • What is PHP Type Juggling and loose comparison?
    What is PHP Type Juggling and loose comparison?
    PHPtypejugglingandloosecomparisoncanleadtounexpectedbehavior.1.Typejugglingautomaticallyconvertsvariabletypesduringoperations,suchasturninganumericstringintoanintegerformath.2.Loosecomparison(==)convertstypesbeforecomparing,making"10"equalt
    PHP Tutorial . Backend Development 874 2025-07-09 02:53:21
  • PHP find the position of the last occurrence of a substring
    PHP find the position of the last occurrence of a substring
    The most direct way to find the last occurrence of a substring in PHP is to use the strrpos() function. 1. Use strrpos() function to directly obtain the index of the last occurrence of the substring in the main string. If it is not found, it returns false. The syntax is strrpos($haystack,$needle,$offset=0). 2. If you need to ignore case, you can use the strripos() function to implement case-insensitive search. 3. For multi-byte characters such as Chinese, the mb_strrpos() function in the mbstring extension should be used to ensure that the character position is returned instead of the byte position. 4. Note that strrpos() returns f
    PHP Tutorial . Backend Development 882 2025-07-09 02:49:21
  • php regex for positive lookahead
    php regex for positive lookahead
    Forward-first assertion is implemented in PHP via (?=...) to match content that is followed by a specific pattern without capturing that part. 1. The syntax format is pattern(?=assertion), such as run(?=ing) matches the run followed by ing; 2. When using it, please note that the regular expression must be wrapped with slashes, and the assertion position should be immediately after the matching content; 3. Common errors include forgetting slashes, assertion position errors, and misunderstandings and not capturing characteristics; 4. Application scenarios include extracting the content before a specific suffix, avoiding mismatch, combining negative assertions, etc.; 5. Use it in conjunction with functions such as preg_match or preg_replace to improve the ability to process complex text.
    PHP Tutorial . Backend Development 782 2025-07-09 02:49:01
  • PHP prepared statement with variable table name
    PHP prepared statement with variable table name
    The reason why the table name cannot be bound with parameters is that preprocessing parameters can only be used for the location of the value, and the table name belongs to the SQL structure part. 1. Whitelist verification: limit the range of optional table names; 2. Use backticks to wrap the table names to avoid keyword conflicts; 3. Map table names from within the program instead of directly using user input; 4. Always verify the input and record abnormal access to ensure security.
    PHP Tutorial . Backend Development 135 2025-07-09 02:45:51
  • Explain PHP Middleware concept in web applications.
    Explain PHP Middleware concept in web applications.
    Middleware is the code layer for handling common requests and responses in PHPWeb applications. Its core functions include authentication, logging, CORS settings and input filtering. 1. The middleware is located between the request and the response, and is processed layer by layer by layer using the "Onion Model"; 2. It is often used to uniformly handle non-business logic tasks; 3. Logic is implemented through the handle() method in frameworks such as Laravel; 4. Unlike the controller, the middleware handles global operations, while the controller focuses on specific business logic; 5. When writing, you need to pay attention to calling the next middleware, avoiding complex operations, keeping the order correct, and not directly outputting the content.
    PHP Tutorial . Backend Development 916 2025-07-09 02:37:40
  • Explain the difference between GET and POST request methods in php context.
    Explain the difference between GET and POST request methods in php context.
    UseGETtoretrievedatawithoutchangingserverstate,asitappendsdatatotheURL,isbookmarkable,andhassizelimits,whilePOSTsendsdatainthebody,hidessensitiveinfo,allowslargerpayloads,andisusedformodifyingserverdata.1.GETisidealforsearches,filters,orpaginationwhe
    PHP Tutorial . Backend Development 350 2025-07-09 02:37:20
  • PHP string to lowercase
    PHP string to lowercase
    PHP provides a variety of string to lowercase methods, suitable for different scenarios. 1. The strtolower() function is suitable for most English scenarios, converting uppercase letters to lowercase, but poor support for non-ASCII characters; 2. mb_strtolower() supports multilingual, more accurate processing of Unicode encoding, and suitable for special characters such as French and German; 3. You can clean spaces or symbols in combination with trim() or preg_replace() to generate slug format; 4. Use LOWER() to achieve fuzzy matching in database queries, pay attention to whether the index is case sensitive. For pure English systems, strtolower() is used, while for internationalization requirements, mb_strtolower() is used.
    PHP Tutorial . Backend Development 296 2025-07-09 02:34:50
  • which php framework is the fastest
    which php framework is the fastest
    Phalcon is the fastest PHP framework, followed by Laminas and Slim. Phalcon compiles in C extensions, with the highest performance; Laminas enables lightweight and flexibility by loading components on demand; Slim is suitable for building small APIs and services; while Laravel is not the fastest, its rich functionality and ease of use make it efficient and practical enough in most projects.
    PHP Tutorial . Backend Development 465 2025-07-09 02:30:31
  • What is the difference between PHP sessions and cookies?
    What is the difference between PHP sessions and cookies?
    The difference between Sessions and cookies is in the location of data storage and management. 1. Cookies are stored in the user's browser and can be viewed and modified, suitable for persisting non-sensitive data; 2. Session data is stored on the server, and only sending session IDs to the browser, suitable for storing sensitive information; 3. Cookies can exist for a long time by default, and the session usually ends with the browser's closing; 4. Use sessions to handle authentication and temporary tracking, and use cookies to remember user preferences; 5. In terms of security, sensitive cookie data must be encrypted, sensitive information should be avoided, session IDs should be protected, and HTTPS transmission should be enabled.
    PHP Tutorial . Backend Development 708 2025-07-09 02:18:01
  • how to fix undefined index in PHP
    how to fix undefined index in PHP
    When encountering the "undefinedindex" error in PHP, the solutions include: 1. Use isset() to determine whether the index exists and avoid directly accessing undefined keys; 2. Use array_key_exists() to check whether the key exists, which is suitable for situations where null values ??need to be distinguished; 3. Set default values ??for variables, such as using the empty merge operator?? to improve the simplicity of the code; 4. Turn on error reports to help locate problems. These practices can effectively prevent errors caused by accessing non-existent array keys, and improve code robustness and maintainability.
    PHP Tutorial . Backend Development 151 2025-07-09 02:08:21
  • PHP trim characters from a string
    PHP trim characters from a string
    PHP's trim() function can be used to remove whitespace characters or other specified characters at the beginning and end of a string. 1. By default, trim() removes spaces, tab characters (\t), line breaks (\n), carriage return characters (\r), empty bytes (\0), and vertical tab characters (\x0B); for example, trim("\n\tHelloWorld!\r\n") outputs HelloWorld! 2. The characters to be removed can be specified through the second parameter, such as trim("---HelloWorld!---","-") returns HelloWorld!, and supports multiple characters, such as trim(&
    PHP Tutorial . Backend Development 259 2025-07-09 02:06:40
  • PHP session security best practices
    PHP session security best practices
    To ensure the security of Session in PHP, the following measures must be taken: 1. Use a strong random SessionID and enable strict mode; 2. Enable HTTPS and set the Secure and HttpOnly flags; 3. Change the SessionID regularly; 4. Prevent SessionFixation and Hijacking. Specific practices include configuring session.entropy_file and session.use_strict_mode, checking the ID legality before session_start(), setting cookie parameters to ensure HTTPS transmission and prohibiting JS access, and calling session_regen after logging in
    PHP Tutorial . Backend Development 724 2025-07-09 02:06:21
  • how to create an associative php array
    how to create an associative php array
    The key to creating an associative array in PHP is to use strings as keys. 1. You can directly assign values ??to create using square brackets or array() functions, such as $user=['name'=>'Tom','age'=>25]; 2. You can also add elements dynamically, such as $user['gender']='male'; 3. You can also generate results through database query, such as using PDO's fetchAll(PDO::FETCH_ASSOC) method; common errors include spelling errors in key names, not adding quotes, and duplication of key names, resulting in overwriting of values.
    PHP Tutorial . Backend Development 802 2025-07-09 02:05:40

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