This function is EXPERIMENTAL. The behaviour of this function, the name of this function, and anything else documented about this function may change without notice in a future release of PHP. Use this function at your own risk.
Test to see if this is a sequenced type. Returns
TRUE if this type is
sequence, otherwise returns
Sequenced types can have the ordering across properties preserved and can
contain unstructured text. For more information on sequenced types see
the section on
Working with Sequenced Data