Creating Palindromes

[Anon]

Hey guys
what i want to do is make a php program which checks if an integer string is a palindrome.
A palindrome is a number which is the same forward as it is backward. Eg:
1256521
The problem is that i want to find every palindrome between 1 and 1000000, and some of these numbers have an even number of digits while others have an odd number of digits.

Any help would be appreciated
Thanks
foobar2k

[Anon]

well, pretty easy.

for ($i = 0; $i < 1000000; $i++) {
if ($i == strrev($i)) {
$myarray[] = $i;
}
}

print_r($myarray);

try that one 🙂

[[deleted]]

Rather than brute forcing your way through this brainblocker,
how about something like this (pseudo code)

for ($t=0;$t<999;$t++)
{
$string=$t.strrev($t);
echo $string;
};
that would give all even-length palindromes between 0 and 999999
up to you to make the odd-length ones.

[yelvington]

A man, a plan, a canal ... Panama!

[Anon]

strrev
never even knew that existed

well thanks guys
i got my job done 🙂

[[deleted]]

but the palindrome of panama would be panamamanap...