phrase search

Not mathematician, could someone explains to me in plain words what
this pseudo code means. If you provide an example it would be very
appreciated. I understand the first part.
Many thanks

Find set of documents D in which all keywords (k1...km) in phrase occur
(using AND query processing).
Intitialize empty set, R, of retrieved documents.

For each document, d, in D:
Get array, Pi ,of positions of occurrences for each ki in d
Find shortest array Ps of the Pi's
For each position p of keyword ks in Ps
For each keyword ki except ks
Use binary search to find a position (p - s + i) in
the array Pi
If correct position for every keyword found, add d to R
Return R

.

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