如何在PHP中将八进制值转换为字符串？

Question

One of my webs service is responding value in octal(010), I want to use this value as key in an array.

$key = 010;
$a[$key] = 'test';
print_r($a);

Result :

Array
(
    [8] => test
)

Expected :

Array
(
    [010] => test
)

PHP is converting 010 value to 9 even I do typecasting, I tried (string) $key and sprintf('%s', $key) but no luck.

Is there anyway do we have to convert octal to string without change the value?

Answer 1

$key = sprintf('%o', $key);

see http://docs.php.net/manual/en/function.sprintf.php
(but then your key is a string, not an integer anymore)

edit: not sure if you want the leading 0 to be printed always

$key = sprintf('0%o', $key);

or to always get a key with three digits

$key = sprintf('%03o', $key);