octdec

(PHP 4, PHP 5)

octdec — 8진수를 10진수로

설명

number octdec ( string $octal_string )

octal_string 인수로 표현되는 8진수에 해당하는 10진수를 반환합니다.

인수

octal_string: 변환할 8진 문자열

반환값

octal_string의 10진 표현

변경점

버전	설명
4.1.0부터	플랫폼의 integer형에 들어가지 않은 큰 수도 변환할 수 있게 되었습니다. 큰 수는 float로 반환합니다.

예제

Example #1 octdec() 예제


<?php
echo octdec('77') . "\n";
echo octdec(decoct(45));
?>

위 예제의 출력:

63
45

참고

decoct() - 10진수를 8진수로
bindec() - 2진수를 10진수로
hexdec() - 16진수를 10진수로
base_convert() - 수를 임의의 진법으로 변환

mt_srand

[edit] Last updated: Sat, 07 Jan 2012

add a note User Contributed Notes octdec

cubbo at quakenet dot php 17-Feb-2009 10:49


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 07:30


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 26-Mar-2007 09:03


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.

10-Sep-2002 07:51


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 02:03


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