Question

Can Some body will help me how can I genrete 5 digit code like if I have a code Like

00001
00002
.
.
.
00009

and then after this it should come back like below
00019
.
.
99999

Please can somebody help me which type of loop I have to do to increment forward and decrements backward.

Many thanks

Answer 1

Using str_pad() to produce a string of constant length, padded by zeros on the left :

for ($i=1 ; $i<10000 ; $i++) {
    echo str_pad($i, 5, '0', STR_PAD_LEFT) . '<br />';
}

And, to go backwards, just change the starting value, condition, and use a decrement in your for loop :

for ($i=99999 ; $i>0 ; $i--) {
    echo str_pad($i, 5, '0', STR_PAD_LEFT) . '<br />';
}