What are some best practices for handling duplicate entries in arrays and merging them into a new array in PHP?

When handling duplicate entries in arrays in PHP, one best practice is to use the array_unique() function to remove duplicates from an array. To merge multiple arrays while removing duplicates, you can use the array_merge() function in combination with array_unique(). This ensures that the resulting array contains only unique values from all the input arrays.

// Example code to merge arrays and remove duplicates
$array1 = [1, 2, 3, 4];
$array2 = [3, 4, 5, 6];
$array3 = [5, 6, 7, 8];

// Merge arrays and remove duplicates
$mergedArray = array_unique(array_merge($array1, $array2, $array3));

print_r($mergedArray);