octdec -- 八進制轉換為十進制
說明
number octdec ( string Octal_string )
返回 octal_string 參數所表示的八進制數的十進制等值。可轉換的最大的數值為 17777777777 或十進制的 2147483647。PHP 4.1.0 開始，該函式可以處理大數字，這種情況下，它會返回 float 類型。
例 1. octdec() 範例
echo octdec('77') . "\n";
echo octdec(decoct(45));
?>
上例將輸出：
63
45
harry at disgruntledgoat dot com
27-Mar-2007 11:03
Calling the sticky bit "text" is not erroneous: On UNIX back in 1974, it instructed the operating system to retain the text segment of the program in swap space after the process exited. This speeded subsequent executions by allowing the kernel to make a single operation of moving the program from swap to real memory.
11-Sep-2002 08:51
The 'S' flag for Unix file access rights is badly computed in the above sample.
If the corresponding 'x' bit (exec) is not set, and the 's' bit (setgid/setuid/sticky) is set, then the flag should not be displayed as and uppercase 'S', but as a lower case 's'. Also the sticky bit (mainly used for folders with public right access rights such as /tmp to protect against deletion by non owner) is badly named ("text"?).
meheler at searchbc dot com
26-Oct-2001 03:03
This function and decoct work great when working with file permissions. For example:
$mode = octdec('4750');
$user['SUID'] = ($mode & 04000);
$user['read'] = ($mode & 00400);
$user['write'] = ($mode & 00200);
$user['execute'] = ($mode & 00100);
$group['sgid'] = ($mode & 02000);
$group['read'] = ($mode & 00040);
$group['write'] = ($mode & 00020);
$group['execute'] = ($mode & 00010);
$other['text'] = ($mode & 01000);
$other['read'] = ($mode & 00004);
$other['write'] = ($mode & 00002);
$other['execute'] = ($mode & 00001);
$attrs = array('-','-','-','-','-','-','-','-','-','-');
if ($system['dir']) $attrs[0] = 'd';
if ($user['read']) $attrs[1] = 'r';
if ($user['write']) $attrs[2] = 'w';
if ($user['execute']) $attrs[3] = 'x';
if ($user['suid']) $attrs[3] = 'S';
if ($group['read']) $attrs[4] = 'r';
if ($group['write']) $attrs[5] = 'w';
if ($group['execute']) $attrs[6] = 'x';
if ($group['sgid']) $attrs[6] = 'S';
if ($other['read']) $attrs[7] = 'r';
if ($other['write']) $attrs[8] = 'w';
if ($other['execute']) $attrs[9] = 'x';
if ($other['text']) $attrs[9] = 'T';
echo '';
echo 'Mode Decimal: ' . $mode . "\n";
echo 'Mode Octal: ' . decoct($mode) . "\n";
echo 'Mode String: ' . implode('',$attrs)."\n";
echo '';
?>
Outputs:
Mode Decimal: 2536
Mode Octal: 4750
Mode String: -rwSr-x---
-Mike
