How to remove all leading zeroes in a string

Question

If I have a string

00020300504
00000234892839
000239074

how can I get rid of the leading zeroes so that I will only have this

Answer 1

Ajay Kumar offers the simplest echo +$numString; I use these:

echo round($val = "0005");
echo $val = 0005;
    //both output 5
echo round($val = 00000648370000075845);
echo round($val = "00000648370000075845");
    //output 648370000075845, no need to care about the other zeroes in the number
    //like with regex or comparative functions. Works w/wo single/double quotes

Actually any math function will take the number from the "string" and treat it like so. It's much simpler than any regex or comparative functions. I saw that in php.net, don't remember where.