How to Checks whether the contents of a variable is a countable value in PHP ?

In PHP, we can check whether the contents of a variable is a countable value or not using the is_countable() function. This function was introduced in PHP 7.3.

The is_countable() function returns true if the given variable is an array or an object that implements the Countable interface. Otherwise, it returns false.

Here's an example:

// Example 1: Countable value
$array = [1, 2, 3];
if (is_countable($array)) {
    echo "The variable is countable.";
} else {
    echo "The variable is not countable.";
}

// Output: The variable is countable.


// Example 2: Non-countable value
$string = "Hello, world!";
if (is_countable($string)) {
    echo "The variable is countable.";
} else {
    echo "The variable is not countable.";
}

// Output: The variable is not countable.

In the above example, we have used the is_countable() function to check whether the $array variable is countable or not. Since $array is an array, the function returns true and the output is "The variable is countable."

Similarly, we have used the is_countable() function to check whether the $string variable is countable or not. Since $string is a string and not an array or an object that implements the Countable interface, the function returns false and the output is "The variable is not countable."