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'