How can PHP developers optimize their code to efficiently query and manipulate arrays with empty values?

When querying and manipulating arrays with empty values in PHP, developers can optimize their code by using functions like array_filter() to remove empty values, array_map() to apply a callback function to each element, and array_values() to reindex the array. These functions can help streamline the code and make it more efficient.

// Example code snippet to efficiently query and manipulate arrays with empty values
$array = [1, 2, '', 4, null, 6];

// Remove empty values from the array
$array = array_filter($array);

// Double the values of the remaining elements
$array = array_map(function($value) {
    return $value * 2;
}, $array);

// Reindex the array
$array = array_values($array);

print_r($array);