How do I check if array value is empty?

Question

Here is my array ouput

Array
(
    [1] => 1
    [2] => 2
    [3] =>  
)

How do I know the [3] => is empty?

Answer 1

Here is a simple solution to check an array for empty key values and return the key.

$a = array('string', '', 5);

        echo array_search(null, $a);
        // Echos 1

To check if array contains an empty key value. Try this.

        $b = array('string','string','string','string','','string');

        if (in_array(null, $b)) {
            echo 'We found a empty key value in your array!';
        }