How can the is_int function be used to check if a variable is an integer in PHP?

The is_int function in PHP can be used to check if a variable is an integer. This function returns true if the variable is an integer and false otherwise. To use this function, simply pass the variable you want to check as an argument to is_int. This can be useful for validating user input or ensuring that a variable is of the correct data type before performing operations on it.

$number = 42;

if (is_int($number)) {
    echo "The variable is an integer.";
} else {
    echo "The variable is not an integer.";
}