A business wants to understand how much revenue they will generate in the next quarter based on historical data. Which type of data analysis will you apply?
- All are equally suitable
- CDA
- EDA
- Predictive Modeling
Predictive Modeling would be the most suitable because it leverages historical data to predict future outcomes, which is exactly what the business needs.
Which of the following plot types is best used to visualize a single continuous variable?
- Pie chart
- Scatter plot
- Histogram
- Bar chart
A Histogram is the best option for visualizing a single continuous variable as it can provide a snapshot of data distribution, showing the center, spread and skewness of the dataset.
What function can be used in PHP to filter and validate data?
- filter_var()
- validate_data()
- sanitize_data()
- clean_data()
In PHP, the filter_var() function is commonly used to filter and validate data. It allows you to apply various filters to sanitize and validate input data, such as filtering for specific data types, validating email addresses, sanitizing URLs, and more. The filter_var() function is a versatile tool for data validation and sanitization in PHP. For more information, refer to: http://php.net/manual/en/function.filter-var.php
The continue statement in PHP is used to ______ the current iteration of a loop and move the program control to the next iteration.
- Skip
- Terminate
- Pause
- Restart
The correct option is: "Skip." The continue statement in PHP is used to skip the remaining code in the current iteration of a loop and move the program control to the next iteration. It allows you to bypass certain iterations based on a condition. Learn more: https://www.php.net/manual/en/control-structures.continue.php
In PHP, you can define an abstract class using the abstract keyword like abstract class ClassName { ______ }.
- public methods and properties
- abstract methods and properties
- private methods and properties
- static methods and properties
In PHP, to define an abstract class, you can indeed use the abstract keyword followed by the class keyword and the name of the class. For example: abstract class ClassName { }. Within the abstract class, you can define both abstract methods (without implementation) and non-abstract methods (with implementation). Abstract methods serve as placeholders that must be implemented in the child classes that inherit from the abstract class. To learn more, see: http://php.net/manual/en/language.oop5.abstract.php
Are Parent constructors called implicitly inside a class constructor?
- Yes
- No
- Depends on the scenario
- Only in abstract classes
Parent constructors are not called implicitly inside a class constructor in PHP. You need to explicitly call the parent constructor using parent::__construct(). Learn more: http://php.net/manual/en/language.oop5.decon.php
In a PHP while loop, where is the condition tested?
- Before each iteration
- After each iteration
- At the beginning of the loop
- At the end of the loop
In a PHP while loop, the condition is tested before each iteration. Before executing the code block for each iteration, the condition is evaluated. If the condition evaluates to true, the code block will be executed. If the condition evaluates to false, the loop will be terminated, and the execution will continue with the code following the loop. The condition is checked at the beginning of each iteration to determine whether the loop should continue or not. Learn more: https://www.php.net/manual/en/control-structures.while.php
What types of data can be encoded into JSON using the json_encode() function in PHP?
- Arrays, objects, strings, numbers, booleans, and null values
- Arrays, objects, strings, integers, floats, booleans, and null values
- Arrays, objects, strings, integers, booleans, and undefined values
- Arrays, objects, strings, integers, booleans, and empty values
The json_encode() function in PHP can encode various types of data into JSON. It can handle arrays, objects, strings, numbers (integers and floats), booleans, and null values. The correct option is "Arrays, objects, strings, numbers, booleans, and null values" as it includes all the mentioned data types that can be encoded into JSON using json_encode(). For further information, consult the PHP documentation on json_encode(): http://php.net/manual/en/function.json-encode.php
What can be potential issues when working with associative arrays in PHP?
- Accessing non-existent elements can result in errors.
- Modifying an element does not affect the original array.
- Associative arrays can only store a fixed number of elements.
- Associative arrays always have a predefined size.
The correct option is 1. When working with associative arrays in PHP, accessing non-existent elements can result in errors, such as "Undefined index." It is crucial to ensure that the desired keys exist in the associative array before attempting to access them. Modifying an element in an associative array directly affects the original array, as they are passed by reference. Associative arrays in PHP can dynamically grow or shrink based on the number of key-value pairs, and they do not have a predefined size. They can store any number of elements, allowing for flexibility in data representation. Learn more: https://www.php.net/manual/en/language.types.array.php#language.types.array.syntax
You have a PHP script and you need to call a static method. How would you do this?
- Using the class name followed by the :: operator and the method name
- Using the object of the class followed by the -> operator and the method name
- Using the call_static_method() function
- Using the execute_static_method() function
To call a static method in PHP, you would use the class name followed by the :: operator and the method name. This allows you to access the static method without creating an instance of the class. Static methods are invoked directly on the class itself, not on an object.