Last updated: Fri, 18 Jul 2008

octdec

(PHP 4, PHP 5)

octdec — Da ottale a decimale

Descrizione

int octdec ( string $stringa_ottale )

Restituisce l'equivalente decimale del numero ottale rappresentato dall'argomento stringa_ottale. OctDec converte una stringa ottale in un numero decimale. Il più grande numero che può essere convertito è 17777777777 o 2147483647 in decimale.

Example #1 Esempio per octdec()


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

L'esempio precedente visualizzerà:

Vedere anche decoct(), bindec(), hexdec() e base_convert().

mt_srand

Last updated: Fri, 18 Jul 2008

add a note User Contributed Notes
octdec

contato at andersonfraga dot net
18-Aug-2008 10:30


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 01:03


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 10:51


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 05:03


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

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mt_srand

Last updated: Fri, 18 Jul 2008