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Articles by Alok Prasad
28 articles
Differentiate between exception and error in PHP
In PHP, understanding the difference between errors and exceptions is crucial for effective error handling and debugging. Both represent problems in code execution, but they behave differently and require different handling approaches. Key Differences Recovery: Errors typically cannot be recovered from and require termination of execution. Exceptions can be caught and handled using try-catch blocks, allowing program execution to continue. Handling: Errors cannot be handled with try-catch blocks in most cases. Exceptions are specifically designed to be caught and handled gracefully. Origin: Exceptions are related to application logic and business rules. Errors are often related to the ...
Read MoreIs PHP compiled or interpreted?
PHP uses a hybrid approach − it is both compiled and interpreted. PHP code is first compiled to intermediate bytecode, which is then interpreted by the Zend Engine at runtime. How PHP Execution Works When you run a PHP script, the following process occurs ? PHP Source Code (.php files) PHP Compiler ...
Read MoreWhat is the use of ini_set() in PHP?
The ini_set() function in PHP allows you to modify PHP configuration settings at runtime for the current script. This is useful when you need to change settings that are normally defined in the php.ini file, but only for a specific script execution. Syntax ini_set(string $option, string|int|float|bool|null $value): string|false Parameters option The configuration option name to modify. Not all php.ini settings can be changed using ini_set() − only those with modes INI_USER or INI_ALL can be modified at runtime. value The new value for the configuration option. The value will be converted ...
Read MoreWhat is the meaning of a Persistent Cookie in PHP?
A persistent cookie is a cookie that is stored permanently on the user's computer and remains available even after the browser is closed. Unlike session cookies which are temporary and stored only in browser memory, persistent cookies are saved to the hard disk and can be accessed across multiple browser sessions. Creating Persistent Cookies in PHP To create a persistent cookie in PHP, you must set an expiration time using the setcookie() function. The cookie will persist until the specified expiration date ? Reading Persistent Cookies You can retrieve persistent cookie values ...
Read MoreWhat is .htaccess in PHP?
.htaccess is a configuration file for web servers running the Apache server software. When a .htaccess file is placed in a directory that is loaded via the Apache web server, the file is detected and executed by Apache. .htaccess files can be utilized to modify the setup of the Apache server software to enable additional functionality and features. We can use the .htaccess file for various configuration alterations in Apache web server software. Some common uses are listed below − ErrorDocuments Creating custom error pages allows us to show website visitors a friendly error message when a ...
Read MoreProgram to find how many times a character appears in a string in PHP
In PHP, you can count how many times each character appears in a string by converting the string into an array and iterating through it. This technique is useful for text analysis and character frequency counting. Example Here's how to count character occurrences in a string ? Output w appears 1 times e appears 2 times l appears 2 times c appears 1 times o appears 4 times m appears 1 times t appears 4 times u appears 1 times r appears 1 times i appears 2 times a appears 1 ...
Read MoreWhat is traits in PHP?
In PHP 5.4, traits were introduced to object-oriented programming to solve the limitations of single inheritance. A trait is similar to a class but is designed specifically for grouping methods in a fine-grained and reusable way. Unlike classes, traits cannot be instantiated directly − they must be used within classes using the use keyword. Syntax trait TraitName { // methods and properties } class ClassName { use TraitName; // class methods and properties } Example Here's how to define and use ...
Read MoreIs there any advantage to using __construct() instead of the class's name for a constructor in PHP?
Yes, there are several advantages to using the magic function __construct() instead of the class's name for constructors in PHP − The magic function __construct() was introduced in PHP 5.0. One advantage of using __construct() over ClassName() as a constructor is if you change the name of the class, you don't need to update the constructor which supports DRY (don't repeat yourself) concept. If you have a child class you can call parent::__construct() to call the parent constructor in an easy way. Old-style constructors (using class names) are deprecated in PHP 7.0 and removed in PHP 8.0, making ...
Read MoreWhat is dependency injection in PHP?
Dependency injection is a design pattern where objects receive their dependencies from external sources rather than creating them internally. This approach promotes loose coupling, improves testability, and makes code more maintainable by avoiding hard-coded dependencies. There are several approaches to inject dependencies into objects. Here are the most commonly used methods − Constructor Injection In this approach, dependencies are injected through the class constructor when the object is instantiated − Total skills: 3 Skills: PHP, JQUERY, AJAX Setter Injection In setter injection, dependencies are provided through setter methods ...
Read MoreHow to Zip a directory in PHP?
We can use PHP's ZipArchive class to zip and unzip directories in PHP. As of PHP 5.3, this class is built-in. Windows users need to enable php_zip.dll in their php.ini file. Installation Note: Ensure the PHP Zip extension is enabled. On Windows, uncomment extension=zip in php.ini. On Linux, install with sudo apt-get install php-zip. Basic Directory Zipping Here's how to zip all files in a directory − Recursive Directory Zipping To zip directories with subdirectories, use this recursive function − Key Points ...
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