Web студия "GrandView"

Description

number octdec ( string octal_string )

Returns the decimal equivalent of the octal number represented by the octal_string argument. The largest number that can be converted is 17777777777 or 2147483647 in decimal. As of PHP 4.1.0, this function can also convert larger numbers. It returns float in that case.

Пример 1. octdec() example

<?php echo octdec('77') . "\n"; echo octdec(decoct(45)); ?>
Результат выполнения данного примера:
63 45

add a note User Contributed Notes
octdec

harry at disgruntledgoat dot com
27-Mar-2007 04:03


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 01:51


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
25-Oct-2001 08:03


This function and decoct work great when working with file permissions. For example:



<?php

    $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 '<pre>';

    echo 'Mode Decimal: ' . $mode . "\n";

    echo 'Mode Octal: ' . decoct($mode) . "\n";

    echo 'Mode String: ' . implode('',$attrs)."\n";

    echo '</pre>';

?>



Outputs:



Mode Decimal: 2536

Mode Octal: 4750

Mode String: -rwSr-x---



-Mike

add a note