substr('This is a test',6,2)wouldreturn 'is'
substr('This is a test',6)wouldreturn 'is a test'
substr('TechOnTheNet',1,4)wouldreturn 'Tech'
substr('TechOnTheNet', -3,3)wouldreturn 'Net'
substr('TechOnTheNet', -6,3)wouldreturn 'The'
substr('TechOnTheNet', -8,2)wouldreturn 'On'