octdec

(PHP 4, PHP 5)

octdec — Octal to decimal

Описание

number octdec ( string $octal_string )

Returns the decimal equivalent of the octal number represented by the octal_string argument.

Список параметров

octal_string: The octal string to convert

Возвращаемые значения

The decimal representation of octal_string

Список изменений

Версия	Описание
Since 4.1.0	The function can now convert numbers that are too large to fit into the platforms integer type, larger values are returned as float in that case.

Примеры

Пример #1 octdec() example

<?php
echo octdec('77') . "\n";

                echo octdec(decoct(45));
?>

Результат выполнения данного примера:

63
45

Смотрите также

decoct() - Decimal to octal
bindec() - Binary to decimal
hexdec() - Hexadecimal to decimal
base_convert() - Convert a number between arbitrary bases

mt_srand

Математические функции

PHP Manual

User Contributed Notes
octdec

cubbo at quakenet dot php
18-Feb-2009 01:49

Hi, this is an attempt to explain octdec().

                

                There is one bug, if input is not octal, it doesn't return a proper decimal.

                

                <?php

                

                $octal = (int) "764";

                

                function octal_to_decimal($int)

                    {               

                        $data = integer;

                        $i = (strlen($int) - 1);   

                        $parse_int = str_split($int);

                        foreach($parse_int as $value)

                            {

                                $data += (int)($value * pow(8, $i));

                                $i--;

                            }       

                        return $data;

                    }
 /**

                *    explanation of the PHP function octdec()

                */
 print octal_to_decimal($octal) . "<br />";

                
 /**

                *    the PHP function octdec()

                */
 print octdec($octal);

                
 ?>

contato at andersonfraga dot net
18-Aug-2008 08:30

Number is octal?

                

                Simple and easy:

                

                <?php

                
 function is_octal($x) {

                    return decoct(octdec($x)) == $x;

                }

                

                echo is_octal(077); // true
 echo is_octal(195); // false

                
 ?>


                Thanks

                []'s

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:

                

                <?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