What does this function do:
- tests whether $variable is a number and ends in 2
- tests whether $variable ends in 2
- tests whether $variable is a number and contains 2
- tests whether $variable is an even number
The function uses is_numeric() to verify $variable is a number, then applies the modulo operator (%) with 2. The expression $variable % 2 returns the remainder when divided by 2. For even numbers, this remainder is 0, so the condition evaluates to true. Options A, B, and C incorrectly focus on the digit 2 rather than evenness.
The function returns true only when is_numeric(\$variable) is true AND \$variable % 2 == 0 is true, i.e., the value is both a number and evenly divisible by two. That combination is exactly the definition of an even number, so the function is a test for "is this an even number," not a test about the value's last digit or its numeric contents. The other options misread % 2 == 0 as being about the digit "2" appearing in the number, which the modulo operator does not do.