mt_srand

[edit] Last updated: Fri, 14 Jun 2013

octdec

(PHP 4, PHP 5)

octdec — Octal para decimal

Descrição

number octdec ( string $octal_string )

Retorna o decimal equivalente do número octal representado pelo argumento octal_string.

Parâmetros

octal_string: A string octal a ser convertida

Valor Retornado

A representação decimal de octal_string

Changelog

Versão	Descrição
Since 4.1.0	A função pode agora converter números que são maiores que o tipo integer da plataforma, valores maiores são retornados como float neste caso.

Exemplos

Exemplo #1 Exemplo da octdec()


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

O exemplo acima irá imprimir:

63
45

Veja Também

decoct() - Decimal para octal
bindec() - Binário para decimal
hexdec() - Hexadecimal para decimal
base_convert() - Converte um número entre bases arbitrárias

mt_srand

[edit] Last updated: Fri, 14 Jun 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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