How can one ensure that the output format of an array in PHP matches a specific structure, such as removing duplicate entries?

To ensure that the output format of an array in PHP matches a specific structure, such as removing duplicate entries, you can use the `array_unique()` function. This function removes duplicate values from an array and returns the resulting array with unique values.

// Original array with duplicate entries
$array = [1, 2, 2, 3, 4, 4, 5];

// Remove duplicate entries
$uniqueArray = array_unique($array);

// Output the unique array
print_r($uniqueArray);