Question

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What does a leading zero do for a php int?

I am just a beginner in php. I tried to write program for print the given number as reverse. For example if i use 123 as input the result should be 321. I tried the following code. It works fine. But if the given input is 0123 the output is 38. I couldn’t correct it. How can i correct my code? here is my code.

<?php
$n=123;
$b=0;
while($n>=1)
{
    $b=$b*10+$n%10;
    $n=$n/10;
}
echo $b;
?>

Answer 1

Yes, it’s because the numbers that are starting with 0 are considered in base 8, so 0123 is in fact 83 in base 10.

So, your algorithm is correct for integer numbers – if you want the revert of 0123 to be 3210, you could simply revert it as a string and you can simply use the strrev function