get_magic_quotes_gpc

(PHP 4, PHP 5)

get_magic_quotes_gpcGets the current configuration setting of magic_quotes_gpc

Descrierea

bool get_magic_quotes_gpc ( void )

Returns the current configuration setting of magic_quotes_gpc

Keep in mind that attempting to set magic_quotes_gpc at runtime will not work.

For more information about magic_quotes, see this security section.

Valorile întoarse

Returns 0 if magic_quotes_gpc is off, 1 otherwise. Or always returns FALSE as of PHP 5.4.0.

Istoria schimbărilor

Versiunea Descriere
5.4.0 Always returns FALSE because the magic quotes feature was removed from PHP.

Exemple

Example #1 get_magic_quotes_gpc() example

<?php
// If magic quotes are enabled
echo $_POST['lastname'];             // O\'reilly
echo addslashes($_POST['lastname']); // O\\\'reilly

// Usage across all PHP versions
if (get_magic_quotes_gpc()) {
    
$lastname stripslashes($_POST['lastname']);
}
else {
    
$lastname $_POST['lastname'];
}

// If using MySQL
$lastname mysql_real_escape_string($lastname);

echo 
$lastname// O\'reilly
$sql "INSERT INTO lastnames (lastname) VALUES ('$lastname')";
?>

Note

Notă:

If the directive magic_quotes_sybase is ON it will completely override magic_quotes_gpc. So even when get_magic_quotes_gpc() returns TRUE neither double quotes, backslashes or NUL's will be escaped. Only single quotes will be escaped. In this case they'll look like: ''

Vedeți de asemenea

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User Contributed Notes 11 notes

up
3
hetored at gmail dot com
4 years ago
Here's what I came up with to remove magic quotes from request data.

Replaces two single-quotes with one if magic_quotes_sybase are on, otherwise it just strips slashes.

Note that the `foreach` style makes this work only with PHP 5 and above.

<?php

// Strip magic quotes from request data.
if (function_exists('get_magic_quotes_gpc') && get_magic_quotes_gpc()) {
   
// Create lamba style unescaping function (for portability)
   
$quotes_sybase = strtolower(ini_get('magic_quotes_sybase'));
   
$unescape_function = (empty($quotes_sybase) || $quotes_sybase === 'off') ? 'stripslashes($value)' : 'str_replace("\'\'","\'",$value)';
   
$stripslashes_deep = create_function('&$value, $fn', '
        if (is_string($value)) {
            $value = '
. $unescape_function . ';
        } else if (is_array($value)) {
            foreach ($value as &$v) $fn($v, $fn);
        }
    '
);
   
   
// Unescape data
   
$stripslashes_deep($_POST, $stripslashes_deep);
   
$stripslashes_deep($_GET, $stripslashes_deep);
   
$stripslashes_deep($_COOKIE, $stripslashes_deep);
   
$stripslashes_deep($_REQUEST, $stripslashes_deep);
}

?>
up
2
heiko dot richler at informatik dot fh-nuernberg dot de
6 years ago
@ dot dot dot dot dot alexander at gmail dot com

I suggest replacing foreach by "stripslashes_deep":

Example #2 Using stripslashes() on an array on
<http://www.php.net/manual/en/function.stripslashes.php>:

<?php
function stripslashes_deep($value)
{
   
$value = is_array($value) ?
               
array_map('stripslashes_deep', $value) :
               
stripslashes($value);

    return
$value;
}
?>

This gives:

<?php
if((function_exists("get_magic_quotes_gpc") && get_magic_quotes_gpc())    || (ini_get('magic_quotes_sybase') && (strtolower(ini_get('magic_quotes_sybase'))!="off")) ){
   
stripslashes_deep($_GET);
   
stripslashes_deep($_POST);
   
stripslashes_deep($_COOKIE);
}
?>
up
2
Alix Axel
4 years ago
For those of you who need a portable magic quotes antidote here is a solution that fixes both keys and values in multi-dimensional arrays:

<?php

if (get_magic_quotes_gpc() === 1)
{
   
$_GET = json_decode(stripslashes(json_encode($_GET, JSON_HEX_APOS)), true);
   
$_POST = json_decode(stripslashes(json_encode($_POST, JSON_HEX_APOS)), true);
   
$_COOKIE = json_decode(stripslashes(json_encode($_COOKIE, JSON_HEX_APOS)), true);
   
$_REQUEST = json_decode(stripslashes(json_encode($_REQUEST, JSON_HEX_APOS)), true);
}

?>

Look mum, no recursion! :P Enjoy!
up
2
eltehaem at poczta dot onet dot pl
10 years ago
Please note, that when magic_quotes_gpc is set not only $_POST, $_GET, $_REQUEST, $_COOKIE arrays values are slashed. Actually every string value in $GLOBALS array is slashed, ie. $GLOBALS['_SERVER']['PATH_INFO'] (or $_SERVER['PATH_INFO']).
up
1
slonmron_no_spam_please_ at yahoo dot com
8 years ago
Re: php at kaiundina dot de (03-Feb-2005 02:18)

1. magic_quotes_gpc=on/off and magic_quotes_sybase=on/off

I made test and your function worked right.
These were the <input ... /> names I used:
name="a"
name="b.b b\b"
name="c[c.1]"
name="c[c 2]"
name="c[c\3]"
name="c.c c[c.' 4]"
name="c ' c[c&quot;4]"
name="d&quot;[d&quot;1]"

(I used &quot; because I don't know other way to put " into the name)

and the user-input value:
a ' " \ \' \" \\ a

2. > 17) The chars '.', ' ' are always replaced by '_' when used in keys.

This is true only for the top-level keys, such as "b.b b\b", "c.c c" and "c ' c" above. The second-level key "[c.' 4]" was not changed to [c_'_4] but was escaped acording to how magic_quites_XXX are set.

Tested on PHP 4.4.0.

These magic_quotes are really black magic :(

It'll be good to make test against $_SESSION, but I can't do it today.
up
1
venimus at gmail dot com
8 years ago
When you work with forms and databases you should use this concept:

1.When inserting the user input in DB escape $_POST/$_GET with add_slashes() or similar (to match the speciffic database escape rules)

$query='INSERT INTO users SET fullname="'.add_slashes($_POST['fullname']).'"';
insert_into_db($query);

2.When reading a previously submitted input from DB use html_special_chars to display an escaped result!

read_db_row('SELECT fullname FROM users');
echo '<input type="text" name="fullname" value="'.html_special_chars($db_row['fullname']).'" />

this way you safely store and work with the original(unescaped) data.
up
0
Rolf Kaiser
1 month ago
Regarding rogier's analysis: strip_json() is definitely the one to go with, so long as you don't use Unicode in the variables.  Because of the use of json_encode() and json_decode, these will get mangled.  If you do need Unicode, strip_deep2() should be used instead.
up
0
louis at greynoise dot co dot uk
6 years ago
<?php
function stripper($stringvar){
    if (
1 == get_magic_quotes_gpc()){
       
$stringvar = stripslashes($stringvar);
    }
    return
$stringvar;
}
?>

Usage:

<?php
$Body
= stripper($rs->fields('Body'));
echo(
$Body);
?>

This checks if get_magic_quotes_gpc() is on and strips a string variable for output if its on. Useful if the dev server and live server are set up different.
up
0
dot dot dot dot dot alexander at gmail dot com
6 years ago
Just a little correction:
( Because of the ini_get function that may return a string value of "off" that evaluates to TRUE )
<?php
       
if(  
            ( 
function_exists("get_magic_quotes_gpc") && get_magic_quotes_gpc()  )
             || ( 
ini_get('magic_quotes_sybase') && ( strtolower(ini_get('magic_quotes_sybase')) != "off" )  )
           ){
            foreach(
$_GET as $k => $v) $_GET[$k] = stripslashes($v);
            foreach(
$_POST as $k => $v) $_POST[$k] = stripslashes($v);
            foreach(
$_COOKIE as $k => $v) $_COOKIE[$k] = stripslashes($v);
        }
?>
up
-1
php at kaiundina dot de
9 years ago
Escaping of key-strings in GPC-arrays behave different to the escaping of their values.

First I expected that keys in submitted gpc-arrays are never escaped.
Anyway. After I saw escaped keys, I assumed they're escaped according to the settings of magic quotes.
... it's even worse...

It took me over 2 days of testing to figure out the exact behavior and creating two functions (one for each php-version) that strips slashes reliably from any array submitted to a script. Hope this saves someones time and nerves.

The following is true for $_GET- and $_POST-arrays. I hope other arrays affected by magic quotes behave equally.
I did not test the behavior for cases where magic_quotes_sybase is set.

== legend for possible case combinations ==
Px = php version we're using
    P4 = php 4.3.9
    P5 = php 5.0.2

MQ = MagicQuotes GPC
    +MQ = magic quotes enabled
    -MQ = magic quotes disabled

TL = TopLevel key
    +TL = key is on top level (i.e. $_GET['myKey'])
    -TL = key is nested within another array (i.e. $_GET['myList']['myKey'])

AK = ArrayKey
    +AK = the value of the key is another array (i.e. is_array($_GET['myKey']) == true)
    -AK = the value is a normal string (i.e. is_string($_GET['myKey']) == true)

== legend for possible results ==
KE = KeyEscaping
    +KE = control chars are prefixed with a backslash
    -KE = key is returned as submitted and needn't to be stripped

VE = ValueEscaping (doesn't apply for array as value)
    +VE = control chars are prefixed with a backslash
    -VE = value is returned as submitted and needn't to be stripped

== here we go - the following rules apply ==
1) P4 +MQ +AK +TL --> -KE
2) P4 +MQ +AK -TL --> +KE
3) P4 +MQ -AK +TL --> -KE +VE
4) P4 +MQ -AK -TL --> +KE +VE
5) P4 -MQ +AK +TL --> -KE
6) P4 -MQ +AK -TL --> -KE
7) P4 -MQ -AK +TL --> -KE -VE
8) P4 -MQ -AK -TL --> -KE -VE
9) P5 +MQ +AK +TL --> -KE
10) P5 +MQ +AK -TL --> +KE
11) P5 +MQ -AK +TL --> +KE +VE
12) P5 +MQ -AK -TL --> +KE +VE
13) P5 -MQ +AK +TL --> -KE
14) P5 -MQ +AK -TL --> -KE
15) P5 -MQ -AK +TL --> +KE -VE
16) P5 -MQ -AK -TL --> +KE -VE
17) The chars '.', ' ' are always replaced by '_' when used in keys.

Example (rule 15):
When running under php 5.0.2 having magic quotes disabled, gpc-keys on top level containing strings are escaped while their associated values are not.

== The following function will strip GPC-arrays for php 4.3.9 ==

<?php
function transcribe($aList, $aIsTopLevel = true) {
   
$gpcList = array();
   
$isMagic = get_magic_quotes_gpc();
   
    foreach (
$aList as $key => $value) {
       
$decodedKey = ($isMagic && !$aIsTopLevel)?stripslashes($key):$key;
        if (
is_array($value)) {
           
$decodedValue = transcribe($value, false);
        } else {
           
$decodedValue = ($isMagic)?stripslashes($value):$value;
        }
       
$gpcList[$decodedKey] = $decodedValue;
    }
    return
$gpcList;
}
?>


== The following function will strip GPC-arrays for php 5.0.2 ==
<?php
function transcribe($aList, $aIsTopLevel = true) {
   
$gpcList = array();
   
$isMagic = get_magic_quotes_gpc();
   
    foreach (
$aList as $key => $value) {
        if (
is_array($value)) {
           
$decodedKey = ($isMagic && !$aIsTopLevel)?stripslashes($key):$key;
           
$decodedValue = transcribe($value, false);
        } else {
           
$decodedKey = stripslashes($key);
           
$decodedValue = ($isMagic)?stripslashes($value):$value;
        }
       
$gpcList[$decodedKey] = $decodedValue;
    }
    return
$gpcList;
}
?>

Usage:

<?php
$unstrippedGET
= transcribe($_GET);
$unstrippedPOST = transcribe($_POST);
?>

Maybe someone is willing to test those combinations for other php-versions and with magic_quotes_sybase set to 'on' - let me know.
Sorry for this huge amount of text, but it's complete. I was unable to compress the decision table more than this.
up
-2
rogier at dsone
2 years ago
Regarding the three main strip methods as found below (two using foreach, 1 using the json method), I've done a little benchmarking using 'true' profiling (using a registered tickhandler where declare(ticks=1)).
I wondered whether or not json would not be terribly slow.
I won't discuss the profiler, but will suffice with the following statement, followed by the used code to benchmark:

The json method was by FAR the quickest (contrary to what I'd thought), so if you need a speedy process, use that!

<?php
declare(ticks=1);
function
g()
{
    return array(
       
'a'=>'i\\\\\\'m',
        array('
a1' => 'x', 'b1' => 'x'),
        array( '
a2' => array('a3' => '\\\\\\'x', 'b3' => 'random' )
        )
    );
}

function
strip_json($d)
{
   
$rs = json_decode(stripslashes(json_encode($d, JSON_HEX_APOS)), true);
    return
$rs;
}

function
strip_deep1($d)
{
    foreach (
$d as $k=>$v)
    {
        if (
is_array($v)) { $d[$k] = strip_deep1($v); }
        else {
$d[$k] = stripslashes($v); }
    }
    return
$d;
}

function
strip_deep2(&$d)
{
   
$d = is_array($d) ? array_map('strip_deep2', $d) : stripslashes($d);
    return
$d;
}

// now profile it
require_once './TickProfiler.php';
$N = 1000;
$d = g();
TickProfiler::Register();
for (
$i = 0; $i < $N; $i++){ strip_json($d); }
for (
$i = 0; $i < $N; $i++){ strip_deep1($d); }
for (
$i = 0; $i < $N; $i++){ strip_deep2($d); }
TickProfiler::Unregister();
TickProfiler::Display();

?>

My output (PHP 5.3.1, win32):
    [TickProfiler::tick] => Array
        (
            [time] => 0.76188707351685
            [calls] => 46001
        )

    [TickProfiler::Register] => Array
        (
            [time] => 3.0994415283203E-5
            [calls] => 1
        )

    [strip_json] => Array
        (
            [time] => 0.025638580322266
            [calls] => 1000
        )

    [strip_deep1] => Array
        (
            [time] => 0.40303444862366
            [calls] => 36000
        )

    [strip_deep2] => Array
        (
            [time] => 0.14928555488586
            [calls] => 9000
        )

)

As can be seen above, using json speeds output by at least a factor of 5 (nearly 6).
Just wanted to share this :D

Do note the strip_json function has two LOC instead of a plain return statement, otherwise it wouldn't get picked up by the tickprofiler (it would return from the code immediately, never reaching the profiler)!

Usage of the return statement in strip_deep2 is not needed, as the argument is passed by reference.
A new test showed that the time penalty for this is about 0.09 seconds.

This actually means that the factor between strip_deep2 vs strip_json is only about 2.
Still, strip_json would be about twice as fast as strip_deep2
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