mt_srand

[edit] Last updated: Fri, 17 May 2013

octdec

(PHP 4, PHP 5)

octdec — Octal a decimal

Descripción

number octdec ( string $octal_string )

Devuelve el valor decimal equivalente al número octal representado por el argumento cadena_octal.

Parámetros

octal_string: El string octal a convertir

Valores devueltos

La representación decimal de octal_string

Historial de cambios

Versión	Descripción
4.1.0	La función puede ahora convertir números que son demasiado grandes para caber en el tipo integer de la plataforma, los valores más grandes son devueltos, en este caso, como valores de tipo float.

Ejemplos

Ejemplo #1 Ejemplo de octdec()


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

El resultado del ejemplo sería:

63
45

Ver también

decoct() - Decimal a octal
bindec() - Binario a decimal
hexdec() - Hexadecimal a decimal
base_convert() - Convertir un número entre bases arbitrarias

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

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

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

-1

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);



?>

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

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