how i can display numbers ?

[orked]

i want to display number using echo, i wrote the following code

<?php
$a= 01020;
echo $a;
?>

the result :582

i don't understand the result.
this happen only if i add zero to the first place in the number i mean if i write 1020 there is no problem the number will be appeared as it.
please i need an explanation for that.
thanks in advance
shreen

[improvcornartist]

Preceding the number with a zero makes it no longer an integer, but octal notation. This page has a little additional info.

[orked]

thank you very much i understand the point now.