What resources or documentation can be helpful for beginners in PHP to understand and troubleshoot issues like duplicate entries in arrays?

Duplicate entries in arrays can be problematic as they can lead to unexpected behavior in your code. To troubleshoot and resolve this issue, you can use the array_unique() function in PHP. This function removes duplicate values from an array and returns a new array with unique values.

// Sample array with duplicate entries
$myArray = array("apple", "banana", "apple", "orange", "banana");

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

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