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When it comes to removing an element from an array in PHP, the unset() function is the definitive choice because it directly modifies the array by removing a specified element. When you apply unset() to an element in an array, it effectively unsets or deletes that specific key and its associated value from the array.

This function takes as an argument the variable or array element you wish to remove and does not return a value; instead, it changes the structure of the original array. For instance, if you have an array defined as $array = ['apple', 'banana', 'cherry'], executing unset($array[1]) would result in $array containing just 'apple' and 'cherry', effectively removing 'banana'.

The other choices presented do not correspond to actual PHP functions that would accomplish the task of removing an element from an array. This makes unset() the only valid and functional option for the task. Thus, it is crucial to understand the role and functioning of unset() within PHP to effectively manipulate arrays.