You have a loop in your PHP script and you want to skip the rest of the current iteration and move on to the next one if a certain condition is met. How would you do this using continue?
- Use the continue statement to skip the rest of the current iteration and move to the next iteration.
- Use the break statement to terminate the loop execution.
- Use the exit statement to stop the script execution.
- Use the return statement to exit the loop and return a value.
The correct option is: "Use the continue statement to skip the rest of the current iteration and move to the next iteration." The continue statement in PHP is used to skip the remaining code in the current iteration of the loop and move to the next iteration. It allows you to bypass further execution within the current iteration based on a certain condition. Learn more: https://www.php.net/manual/en/control-structures.continue.php
What types of data can be validated using the filter_var() function in PHP?
- Email addresses
- URLs
- IP addresses
- All of the above
The filter_var() function in PHP can be used to validate various types of data, including email addresses, URLs, and IP addresses. It provides specific filters for each of these data types, allowing you to perform validation based on their respective formats and rules. The filter_var() function offers flexibility in data validation for multiple data types. For further information, refer to: http://php.net/manual/en/function.filter-var.php
How can we display information of a variable and readable by a human with PHP?
- Use the var_dump() function
- Use the print_r() function
- Use the info() function
- Use the show() function
To display information about a variable in a human-readable format with PHP, you can use the print_r() function. The print_r() function is used to print the contents of an array or an object in a human-readable format. It can be useful for debugging or displaying complex data structures. For example, you can use print_r($array); to display the contents of an array. Another option is to use the var_dump() function, which provides more detailed information about a variable, including its type and size.
You need to access several global variables from within a function in your PHP script. How would you do this using the $GLOBALS superglobal?
- Access each global variable directly using the $GLOBALS array and the variable name as the key. Use multiple statements to retrieve the values of different global variables.
- Assign the $GLOBALS array to a local variable inside the function and use it to access the global variables. Assign each global variable to a separate local variable.
- Use the 'extract' function to extract the values of all global variables into local variables inside the function.
- Use the 'include' statement to include a file that contains the global variables and then access them within the function.
To access multiple global variables from within a function using the $GLOBALS superglobal, you can access each variable directly using the $GLOBALS array and the variable name as the key. You can use multiple statements to retrieve the values of different global variables. Each statement will access a specific global variable. Learn more: https://www.php.net/manual/en/reserved.variables.globals.php
You are writing a PHP script and you need to define an abstract class. How would you do this?
- abstract class ClassName
- final class ClassName
- static class ClassName
- var class ClassName
To define an abstract class in PHP, you can use the abstract keyword followed by the class keyword and the name of the class. For example: abstract class ClassName {} The abstract keyword indicates that the class is intended to be an abstract class. Abstract classes cannot be instantiated directly and are meant to be extended by other classes. They can contain abstract methods (without implementation) and non-abstract methods (with implementation). Refer to: http://php.net/manual/en/language.oop5.abstract.php
Which of the following are true about the case keyword in a PHP switch statement?
- It represents a possible value for the expression
- It is used to define the default case
- It can only be followed by a numeric value
- It is not required in every case block
The case keyword in a PHP switch statement represents a possible value for the expression. Each case block represents a specific value or condition that is evaluated against the switch expression. When a case value matches the expression, the corresponding block of code is executed. The case keyword allows you to define multiple possible values or conditions to be compared within the switch statement. Each case represents a potential match with the expression. Learn more: https://www.php.net/manual/en/control-structures.switch.php
Associative arrays in PHP use numeric keys.
- TRUE
- FALSE
False. In PHP, associative arrays use user-defined keys, which can be strings or numbers, instead of numeric keys. These keys are used to access the corresponding values in the array. Associative arrays provide a way to associate values with specific keys for easier retrieval and manipulation. The keys can be used to access the values in a non-sequential manner. Learn more: https://www.php.net/manual/en/language.types.array.php
What is the purpose of the array_combine() function in PHP?
- To create an array by combining two arrays
- To sort the elements of an array
- To filter the elements of an array
- To reverse the order of elements in an array
The array_combine() function in PHP is used to create an array by combining the values of one array as keys and another array as values. It takes two arrays as parameters and returns the combined array. This function is useful when you need to create an associative array from corresponding keys and values. Learn more: http://php.net/manual/en/function.array-combine.php
Which of the following are common uses of break and continue in PHP loops?
- Terminating the loop when a specific condition is met.
- Skipping specific iterations based on certain conditions.
- Breaking out of nested loops.
- Continuing to the next iteration of the loop.
- All the options
The correct options are: "Terminating the loop when a specific condition is met," "Skipping specific iterations based on certain conditions," and "Breaking out of nested loops." These are common use cases for break and continue statements, allowing you to control the loop flow based on specific conditions or requirements. Learn more: https://www.php.net/manual/en/control-structures.break.php, https://www.php.net/manual/en/control-structures.continue.php
What is the difference between mysqli_fetch_object() and mysqli_fetch_array()?
- The mysqli_fetch_object() function returns the current row of a result set as an object, while the mysqli_fetch_array() function returns the current row of a result set as an array.
- The mysqli_fetch_object() function returns the current row of a result set as an array, while the mysqli_fetch_array() function returns the current row of a result set as an object.
- The mysqli_fetch_object() function returns the current row of a result set as an associative array, while the mysqli_fetch_array() function returns the current row of a result set as both an associative array and a numeric array.
- The mysqli_fetch_object() function returns the current row of a result set as a numeric array, while the mysqli_fetch_array() function returns the current row of a result set as both an associative array and a numeric array.
The mysqli_fetch_object() function and mysqli_fetch_array() function are used to fetch the current row of a result set in PHP, but they differ in the data structure they return. The mysqli_fetch_object() function returns the current row as an object, where each column is represented as an object property. On the other hand, the mysqli_fetch_array() function returns the current row as an array, where each column can be accessed by its numeric index or column name. Additionally, the mysqli_fetch_array() function supports both associative and numeric indexes, allowing you to retrieve column values using either approach. The choice between the two functions depends on your preferred data structure and how you want to access the fetched data.