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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 FALSE
.
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
Objects.