SplFixedArray::offsetUnset Unsets the value at the specified $index &reftitle.description; public voidSplFixedArray::offsetUnset intindex Unsets the value at the specified index. &reftitle.parameters; index The index being unset. &reftitle.returnvalues; &return.void; &reftitle.errors; Throws RuntimeException when index is outside the defined size of the array or when index cannot be parsed as an integer.