1. What symbol is used to denote a variable in PHP?
Answer:
Explanation:
In PHP, a variable starts with the $ symbol, followed by the name of the variable.
2. Which of the following is a valid variable name in PHP?
Answer:
Explanation:
A valid PHP variable name starts with a letter or underscore, followed by any number of letters, numbers, or underscores.
3. How is a variable with a string value declared in PHP?
Answer:
Explanation:
In PHP, string values can be declared with either single or double quotes.
4. Which of the following is the correct way to declare a constant in PHP?
Answer:
Explanation:
In PHP, constants are declared using the define() function.
5. What is the scope of a variable declared outside of any function in PHP?
Answer:
Explanation:
Variables declared outside any function have a global scope in PHP.
6. In PHP, which of the following is a superglobal variable?
Answer:
Explanation:
$_GET, $_SESSION, and $_COOKIE are all examples of superglobal variables in PHP.
7. What is the correct way to check if a variable is set in PHP?
Answer:
Explanation:
The isset() function is used to check if a variable is set and is not NULL.
8. Which of the following is a valid way to increment a variable in PHP?
Answer:
Explanation:
All the options are valid ways to increment a variable's value by 1 in PHP.
9. How are arrays declared in PHP?
Answer:
Explanation:
Arrays in PHP can be declared using either the array() function or the short array syntax [].
10. What is the purpose of the global keyword in PHP functions?
Answer:
Explanation:
The global keyword is used inside a function to access a variable that is defined in the global scope.