Sanitize number by removing first digit then any consecutive zeros

Question

I have an array of numbers, for example:

10001234
10002345

Now I have a number, which should be matched against all of those numbers inside the array. The number could either be 10001234 (which would be easy to match), but it could also be 100001234 (4 zeros instead of 3) or 101234 (one zero instead of 3) for example. Any combination could be possible. The only fixed part is the 1234 at the end.

I can't simply isolate the last 4 chars, because the needed value can sometimes be 3 or 5 or 6 digits in length (like 1000123456).

Answer 1

if always the first number is one you can use this

$Num=1000436346;
echo(int)ltrim($Num."","1");

output:

436346