Home » PHP Quiz » Page 11

You have a PHP script and you need to modify a global variable from within a function. How would you do this using the $GLOBALS superglobal?

  • Use the 'global' keyword followed by the variable name to declare it as global within the function and then modify its value.
  • Assign a new value directly to the variable using the $GLOBALS array and the variable name as the key.
  • Use the 'static' keyword followed by the variable name to declare it as static within the function and then modify its value.
  • Use the 'return' statement to return the modified value to the calling code, which can then update the global variable.
To modify a global variable from within a function using the $GLOBALS superglobal, you can use the 'global' keyword followed by the variable name to declare it as global within the function. After declaring it as global, you can modify its value directly within the function. This way, the changes will be reflected in the global scope. Learn more: https://www.php.net/manual/en/reserved.variables.globals.php
Discuss it

How do you use the $_GET superglobal in PHP?

  • Access the data using the $_GET['key'] syntax.
  • Access the data using the $_GET->$key syntax.
  • Access the data using the $_GET['key'] method.
  • Access the data using the $_GET->key method.
To use the $_GET superglobal in PHP, you can access the data sent in the URL's query string using the $_GET['key'] syntax, where 'key' represents the name of the parameter in the query string. For example, if the URL is "example.com/page.php?name=John", you can access the value "John" by using $_GET['name']. This allows you to retrieve and process data passed through the URL using the GET method. Learn more: https://www.php.net/manual/en/reserved.variables.get.php
Discuss it

You are writing a PHP script and you need to execute some code only if a certain condition is met. How would you do this using an if statement?

  • if ($condition) { ... }
  • if ($condition) { ... } else { ... }
  • if ($condition) { ... } elseif ($condition2) { ... } else { ... }
  • if ($condition) { ... } elseif ($condition2) { ... } endif;
To execute code only if a certain condition is met in PHP, you would use an if statement. The if statement starts with the keyword "if" followed by the condition to be evaluated within parentheses. If the condition is true, the code block associated with the if statement will be executed. If the condition is false, the code block will be skipped. The if statement allows you to selectively execute code based on the result of the condition. Learn more: https://www.php.net/manual/en/control-structures.if.php
Discuss it

What happens if the condition in a PHP while loop is never false?

  • The loop will continue indefinitely
  • The loop will terminate after one iteration
  • The loop will not be executed at all
  • The loop will execute the code block only once
If the condition in a PHP while loop is never false, the loop will continue indefinitely, resulting in an infinite loop. The code block will be executed repeatedly as long as the condition remains true. It is important to ensure that the condition eventually becomes false to avoid infinite loops, as they can consume excessive resources and cause the program to become unresponsive. Infinite loops are generally unintended and can be caused by incorrect logic or a missing update in the loop control variable. It is essential to include logic within the loop to modify the condition or use control statements such as break or exit to terminate the loop when necessary. Learn more: https://www.php.net/manual/en/control-structures.while.php
Discuss it

In PHP, $_REQUEST is a superglobal array that contains the contents of $_GET, $_POST, and $_COOKIE. It is commonly used to collect the ______ data after submitting an HTML form.

  • Form
  • Session
  • Server
  • Cookie
In PHP, the $_REQUEST superglobal array contains the combined data from $_GET, $_POST, and $_COOKIE. It is often used to collect the form data after submitting an HTML form. When a form is submitted, the data is sent either via the URL (GET method) or as part of the request body (POST method). The $_REQUEST superglobal provides a unified way to access the form data regardless of the submission method. By using $_REQUEST, you can collect the form data for further processing or validation. Learn more: https://www.php.net/manual/en/reserved.variables.request.php
Discuss it

What are some common operations you might perform on a MySQL database using PHP?

  • Inserting data into tables
  • Updating existing data
  • Retrieving data from tables
  • All of the above
When working with a MySQL database using PHP, you can perform various common operations such as inserting data into tables, updating existing data, and retrieving data from tables using SELECT queries. Additionally, you can delete data from tables, create or alter database tables or schemas, and execute other administrative tasks. These operations allow you to interact with the database, store and retrieve information, and manipulate data as needed.
Discuss it

You have multiple conditions in your PHP script and you want to test each one in order. How would you do this using if, elseif, and else statements?

  • if ($condition) { ... } elseif ($condition2) { ... } else { ... }
  • if ($condition) { ... } elseif ($condition2) { ... } endif;
  • if ($condition) { ... } else { ... }
  • if ($condition) { ... } elseif ($condition2) { ... } endif;
To test multiple conditions in order in PHP, you would use a combination of if, elseif, and else statements. The if statement is used to check the first condition. If the condition is true, the code block associated with the if statement will be executed. If the condition is false, the elseif statement is evaluated to check the next condition. This process continues until a condition is true, at which point the corresponding code block is executed. If none of the conditions are true, the else statement provides an alternative code block to be executed. Learn more: https://www.php.net/manual/en/control-structures.elseif.php
Discuss it

How can we check if the value of a given variable is a number?

  • You can check if the value of a given variable is a number using the is_numeric() function in PHP.
  • You can check if the value of a given variable is a number using the is_int() function in PHP.
  • You can check if the value of a given variable is a number using the is_string() function in PHP.
  • You can check if the value of a given variable is a number using the is_float() function in PHP.
To check if the value of a given variable is a number in PHP, you can use the is_numeric() function. The is_numeric() function returns true if the value is numeric or a numeric string, and false otherwise. It can be used to validate user input or check the type of a variable. For example, you can use is_numeric($var) to check if the value of $var is a number. It's important to note that is_numeric() considers both integer and float values as numbers. If you specifically want to check if the value is an integer, you can use the is_int() function. Similarly, if you want to check if the value is a float, you can use the is_float() function.
Discuss it

How do you create a MySQL table using PHP?

  • Use the mysqli_query() function to execute a CREATE TABLE query
  • Use the mysqli_create_table() function to create a table
  • Use the mysql_create_table() function to create a table
  • Use the pdo_query() function to execute a CREATE TABLE query
To create a MySQL table using PHP, you can use the mysqli_query() function to execute a CREATE TABLE query. This function takes two parameters: the connection object and the SQL query. The SQL query should be a valid CREATE TABLE statement that specifies the table name, column definitions, and any other table properties. It's important to have a successful connection established before executing the query. Ensure you have appropriate privileges and permissions to create a table on the MySQL server.
Discuss it

How do you access the elements of an indexed array in PHP?

  • By using a loop to iterate through the array and access each element.
  • By using the foreach loop to retrieve the elements one by one.
  • By using the array() function to retrieve the elements.
  • By using the numeric key associated with each element.
In PHP, you can access the elements of an indexed array by using the numeric key associated with each element. The numeric key represents the position of the element within the array. For example, to access the first element of an indexed array, you would use the key 0. To access the second element, you would use the key 1, and so on. By specifying the numeric key in square brackets ([]), you can retrieve the corresponding element. Learn more: https://www.php.net/manual/en/language.types.array.php#language.types.array.syntax
Discuss it