What is the difference between a static import and a dynamic import in JavaScript?
- Static import is used to load modules at compile time, and it's part of the ES6 module system.
- Dynamic import is used to load modules at runtime, and it returns a promise that resolves to the module.
- Static import is used for loading ES6 modules, while dynamic import is used for CommonJS modules.
- There is no difference between static and dynamic imports in JavaScript.
Static imports are used at compile time and load modules synchronously, while dynamic imports are used at runtime and load modules asynchronously. Dynamic imports return a promise that resolves to the module.
For optimizing complex queries involving multiple JOIN operations, one can use ________ to break them into simpler ones.
- Subqueries
- Indexes
- Caching
- Temporary Tables
For optimizing complex queries involving multiple JOIN operations, one can use "Subqueries" to break them into simpler, more manageable queries. Subqueries allow you to retrieve intermediate results that can be used in the main query.
What is an array in PHP?
- A variable that holds multiple values of the same data type.
- A built-in function that performs mathematical calculations.
- A conditional statement used for decision-making.
- A file storage mechanism for storing data permanently.
In PHP, an array is a variable that can hold multiple values of the same or different data types. It is a fundamental data structure used to store and organize data in a specific order. Arrays can be indexed numerically or associatively, allowing access to the elements based on their position or a specific key. They are flexible and widely used in PHP programming. Learn more: https://www.php.net/manual/en/language.types.array.php
You have a PHP script and you need to create a class that uses a trait. How would you do this?
- Using the use keyword followed by the trait name
- Using the include keyword followed by the trait name
- Using the extend keyword followed by the trait name
- Using the require keyword followed by the trait name
To create a class that uses a trait in PHP, you would use the use keyword followed by the trait name. This allows you to include the functionality defined in the trait within the class. The use keyword is used to import the trait into the class and make its methods and properties available for use.
In PHP, an indexed array is an array with numeric keys that are automatically assigned starting from ______.
- 1
- 0
In PHP, an indexed array is an array with numeric keys that are automatically assigned starting from 0. The first element in the array is assigned a key of 0, the second element is assigned a key of 1, and so on. PHP automatically increments the key value by 1 for each subsequent element in the array. This allows for easy access to elements based on their position within the array. Learn more: https://www.php.net/manual/en/language.types.array.php#language.types.array.syntax
What is the $_SERVER superglobal in PHP?
- A superglobal variable that contains information about headers, paths, and script locations.
- A superglobal variable that stores user input from form submissions.
- A superglobal variable that holds session data.
- A superglobal variable that contains database connection details.
The $_SERVER superglobal is a PHP predefined associative array that contains information about headers, paths, and script locations. It provides various server and execution environment-related information. The array elements in $_SERVER are created by the web server and can be accessed directly within PHP scripts. Examples of information stored in $_SERVER include the current script filename, server IP address, request method, and user agent. Learn more: https://www.php.net/manual/en/reserved.variables.server.php
A common practice in PHP file handling is to always close the file after you're done writing to it using the fclose() function to free up ______.
- memory
- resources
- variables
- connections
In PHP, it is a good practice to close the file after you have finished writing to it using the fclose() function. This ensures that the file resources are released and any buffers are flushed. It helps prevent resource leaks and ensures proper cleanup. By closing the file, you free up resources and make them available for other operations.
What are the three classes of errors that can occur in PHP?
- Notices, warnings, and errors
- Syntax errors, runtime errors
- Fatal errors, exceptions, and warnings
- Informational errors, logical errors
In PHP, the three classes of errors are notices (non-critical issues that should be addressed), warnings (potential issues that might cause problems), and errors (critical issues that prevent script execution). Learn more: http://php.net/manual/en/errorfunc.constants.php
You need to destroy a session in your PHP script. How would you do this?
- session_destroy()
- destroy_session()
- end_session()
- close_session()
To destroy a session in PHP, you can use the session_destroy() function. This function removes all session data and ends the current session. Additionally, you may need to call session_unset() to unset all session variables before calling session_destroy(). This combination ensures the complete destruction of the session. To learn more, check: http://php.net/manual/en/function.session-destroy.php
You have a PHP script and you need to perform some initialization when an object of a class is created. How would you do this using a constructor?
- Implement the __construct() method and add the necessary initialization code inside it.
- Implement the init() method and add the necessary initialization code inside it.
- Implement the create() method and add the necessary initialization code inside it.
- Implement the constructor() method and add the necessary initialization code inside it.
In PHP, to perform initialization when an object of a class is created, you would implement the __construct() method within the class and add the necessary initialization code inside it. The correct option is "Implement the __construct() method and add the necessary initialization code inside it." This allows you to define the actions that should be executed automatically upon object creation. For more details, refer to the PHP documentation on constructors: http://php.net/manual/en/language.oop5.decon.php