This is Book2.php for reading data file.

Datafile is 1data.txt

First line is
line nr 0 is:
line nr 1 is:
line nr 2 is:
line nr 3 is:
line nr 4 is:
line nr 5 is:
line nr 6 is:
line nr 7 is:
line nr 8 is:
line nr 9 is:
End of program.