I have discovered that my host doesn't like either of the following directives in the .htaccess file:
php_flag magic_quotes_gpc Off
php_value magic_quotes_gpc Off
However, there is another way to disable this setting even if you don't have access to the server configuration - you can put a php.ini file in the directory where your scripts are with the directive:
magic_quotes_gpc = Off
However, these does not propogate unlike .htaccess rules, so if you launch from a sub-directory, you need the php.ini file in each directory you have as script entry points.
Desabilitando Magic Quotes
A diretiva magic_quotes_gpc só pode ser desabilita em nível de sistema, e não em tempo de execução. Em outras palavras, uso da função ini_set() não é uma opção.
Exemplo #1 Desabilitando magic quotes no lado do servidor
Um exemplo que configuração dessa diretiva para Off (Desligada) no arquivo php.ini. Para detalhes adicionais, leia a seção do manual entitulada Como mudar os valores das configurações.
; Magic quotes ; ; Magic quotes para dados vindos via GET/POST/Cookie. magic_quotes_gpc = Off ; Magic quotes para dados gerados em tempo de execução,ex.: dados vindo de SQL, de chamadas à exec(), etc. magic_quotes_runtime = Off ; Usar magic quotes no estilo Sybase (escapar ' com '' ao invés de \'). magic_quotes_sybase = Off
Se acesso à configuração do servidor não estiver disponível, uso do arquivo .htaccess também é uma opção. Por exemplo:
php_flag magic_quotes_gpc Off
No interesse de escrever código portável (código que funciona em qualquer ambiente), como onde configurar a opção em nível de servidor não for possível, aqui está um exemplo de como desabilitar magic_quotes_gpc em tempo de execução. Esse método é ineficiente então é preferível configurar as diretivas apropriadas em outros lugares.
Exemplo #2 Desabilitando magic quotes em tempo de execução
<?php
if (get_magic_quotes_gpc()) {
$process = array(&$_GET, &$_POST, &$_COOKIE, &$_REQUEST);
while (list($key, $val) = each($process)) {
foreach ($val as $k => $v) {
unset($process[$key][$k]);
if (is_array($v)) {
$process[$key][stripslashes($k)] = $v;
$process[] = &$process[$key][stripslashes($k)];
} else {
$process[$key][stripslashes($k)] = stripslashes($v);
}
}
}
unset($process);
}
?>
A php5 way:
<?php
if (get_magic_quotes_gpc()) {
function stripslashes_gpc(&$value)
{
$value = stripslashes($value);
}
array_walk_recursive($_GET, 'stripslashes_gpc');
array_walk_recursive($_POST, 'stripslashes_gpc');
array_walk_recursive($_COOKIE, 'stripslashes_gpc');
array_walk_recursive($_REQUEST, 'stripslashes_gpc');
}
?>
If php_flag magic_quotes_gpc off does not work
Use php_value magic_quotes_gpc off
insteadin your .htaccess file
I have recently found out that magic quotes affects not only the values of the GPC arrays, but also the keys.
For now, my way to solve with the problem is:
<?php
if (get_magic_quotes_gpc()) {
function magicQuotes_awStripslashes(&$value, $key) {$value = stripslashes($value);}
$gpc = array(&$_GET, &$_POST, &$_COOKIE, &$_REQUEST);
array_walk_recursive($gpc, 'magicQuotes_awStripslashes');
}
?>
Unfortunately it doesn't fix the keys... and cannot determinate if the slashes are already stripped.
PHP's magic quotes function has the strange behavior of not adding slashes to top level keys in GPC key/value pairs but adding the slashes in deeper level keys. To demonstrate, a URI of:
example.php?a'b[c'd]=e'f
produces:
array("a'b" => array("c\'d" => "e\'f"))
The current example for removing magic quotes does not do anything to keys, so after running stripslashes_deep, you would end up with:
array("a'b" => array("c\'d" => "e'f"))
Which, needless to say, is wrong. As if you had magic quotes off, it would have been:
array("a'b" => array("c'd" => "e'f"))
I have written a snippet of code compatible with PHP 4.0.0 and above that handles this correctly:
if (get_magic_quotes_gpc()) {
function undoMagicQuotes($array, $topLevel=true) {
$newArray = array();
foreach($array as $key => $value) {
if (!$topLevel) {
$key = stripslashes($key);
}
if (is_array($value)) {
$newArray[$key] = undoMagicQuotes($value, false);
}
else {
$newArray[$key] = stripslashes($value);
}
}
return $newArray;
}
$_GET = undoMagicQuotes($_GET);
$_POST = undoMagicQuotes($_POST);
$_COOKIE = undoMagicQuotes($_COOKIE);
$_REQUEST = undoMagicQuotes($_REQUEST);
}
The function parse_str() (http://us3.php.net/manual/en/function.parse-str.php) is also affected by magic_quotes_gpc, so if that function is called anywhere, stripslashes_deep won't be sufficient by itself.
The function stripslashes_deep() ignores slashes in the keys
For example a query string like this: ?foo'bar=baz'bal
Output of var_dump($_GET) is:
array(1) {
["foo\'bar"]=>
string(8) "baz\'bal"
}
after stripslashes_deep():
array(1) {
["foo\'bar"]=>
string(7) "baz'bal"
}
If you want the keys to be stripslashed too, you have to unset() the addslahed key and to add a stripslashed version. But keep in mind that this will change the order of the array.
