mt_srand

[edit] Last updated: Fri, 17 May 2013

octdec

(PHP 4, PHP 5)

octdec — Oktal zu Dezimal Umwandlung

Beschreibung

number octdec ( string $octal_string )

Wandelt den oktal kodierten Eingabestring octal_string in die entsprechende Dezimaldarstellung.

Parameter-Liste

octal_string: Der umzuwandelnde Oktalstring

Rückgabewerte

Dezimaldarstellung von octal_string

Changelog

Version	Beschreibung
Seit 4.1.0	Die Funktion kann nun auch Werte umwandeln, die zu groß für den integer Typ der jeweiligen Plattform sind, das Ergebnis wird dann als float zurückgegeben.

Beispiele

Beispiel #1 octdec() Beispiel


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

Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

63
45

Siehe auch

decoct() - Dezimal zu Oktal Umwandlung
bindec() - Umwandlung von binär zu dezimal
hexdec() - Hexadezimal zu Dezimal Umwandlung
base_convert() - Konvertiert einen numerischen Wert zwischen verschiedenen Zahlensystemen

mt_srand

[edit] Last updated: Fri, 17 May 2013

add a note User Contributed Notes octdec - [5 notes]

down

contato at andersonfraga dot net ¶

4 years ago


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

down

Anonymous ¶

10 years ago


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"?).

down

harry at disgruntledgoat dot com ¶

6 years ago


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.

down

-1

meheler at searchbc dot com ¶

11 years ago


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

down

-2

cubbo at quakenet dot php ¶

4 years ago


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);



?>

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