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php session increment problem (php.ini)
php.ini entry for session entry

 11:01 am on Feb 19, 2007 (gmt 0)

I am facing problem in increamenting Session variable. My code goes as follows:

$_SESSION['cart'] = array(
"10" => $q10,
"25" => $q25,
"50" => $q50,
"100" => $q100,
"250" => $q250,
"500" => $q500,
if (!(empty($_POST['bond']))) {
$bond = $_POST['bond'];
if (isset($_SESSION['cart'][$bond]))
$_SESSION['cart'][$bond] = $_SESSION['cart'][$bond] + 1;
$_SESSION['cart'][$bond] = 1;

My php.ini entries for Session are as follows:

; Handler used to store/retrieve data.
session.save_handler = files

; Argument passed to save_handler. In the case of files, this is the path
; where data files are stored. Note: Windows users have to change this
; variable in order to use PHP's session functions.
; As of PHP 4.0.1, you can define the path as:
; session.save_path = "N;/path"
; where N is an integer. Instead of storing all the session files in
; /path, what this will do is use subdirectories N-levels deep, and
; store the session data in those directories. This is useful if you
; or your OS have problems with lots of files in one directory, and is
; a more efficient layout for servers that handle lots of sessions.
; NOTE 1: PHP will not create this directory structure automatically.
; You can use the script in the ext/session dir for that purpose.
; NOTE 2: See the section on garbage collection below if you choose to
; use subdirectories for session storage
; The file storage module creates files using mode 600 by default.
; You can change that by using
; session.save_path = "N;MODE;/path"
; where MODE is the octal representation of the mode. Note that this
; does not overwrite the process's umask.
session.save_path = "/var/lib/php/session"

; Whether to use cookies.
session.use_cookies = 1

; This option enables administrators to make their users invulnerable to
; attacks which involve passing session ids in URLs; defaults to 0.
; session.use_only_cookies = 1

; Name of the session (used as cookie name).
session.name = PHPSESSID

; Initialize session on request startup.
session.auto_start = 0

; Lifetime in seconds of cookie or, if 0, until browser is restarted.
session.cookie_lifetime = 0

; The path for which the cookie is valid.
session.cookie_path = /

; The domain for which the cookie is valid.
session.cookie_domain =

; Handler used to serialize data. php is the standard serializer of PHP.
session.serialize_handler = php

; Define the probability that the 'garbage collection' process is started
; on every session initialization.
; The probability is calculated by using gc_probability/gc_divisor,
; e.g. 1/100 means there is a 1% chance that the GC process starts
; on each request.

session.gc_probability = 1
session.gc_divisor = 1000

; After this number of seconds, stored data will be seen as 'garbage' and
; cleaned up by the garbage collection process.
session.gc_maxlifetime = 1440

; NOTE: If you are using the subdirectory option for storing session files
; (see session.save_path above), then garbage collection does *not*
; happen automatically. You will need to do your own garbage
; collection through a shell script, cron entry, or some other method.
; For example, the following script would is the equivalent of
; setting session.gc_maxlifetime to 1440 (1440 seconds = 24 minutes):
; cd /path/to/sessions; find -cmin +24 ¦ xargs rm

; PHP 4.2 and less have an undocumented feature/bug that allows you to
; to initialize a session variable in the global scope, albeit register_globals
; is disabled. PHP 4.3 and later will warn you, if this feature is used.
; You can disable the feature and the warning separately. At this time,
; the warning is only displayed, if bug_compat_42 is enabled.

session.bug_compat_42 = 0
session.bug_compat_warn = 1

; Check HTTP Referer to invalidate externally stored URLs containing ids.
; HTTP_REFERER has to contain this substring for the session to be
; considered as valid.
session.referer_check =

; How many bytes to read from the file.
session.entropy_length = 0

; Specified here to create the session id.
session.entropy_file =

;session.entropy_length = 16

;session.entropy_file = /dev/urandom

; Set to {nocache,private,public,} to determine HTTP caching aspects
; or leave this empty to avoid sending anti-caching headers.
session.cache_limiter = nocache

; Document expires after n minutes.
session.cache_expire = 180

; trans sid support is disabled by default.
; Use of trans sid may risk your users security.
; Use this option with caution.
; - User may send URL contains active session ID
; to other person via. email/irc/etc.
; - URL that contains active session ID may be stored
; in publically accessible computer.
; - User may access your site with the same session ID
; always using URL stored in browser's history or bookmarks.
session.use_trans_sid = 0

; Select a hash function
; 0: MD5 (128 bits)
; 1: SHA-1 (160 bits)
session.hash_function = 0

; Define how many bits are stored in each character when converting
; the binary hash data to something readable.
; 4 bits: 0-9, a-f
; 5 bits: 0-9, a-v
; 6 bits: 0-9, a-z, A-Z, "-", ","
session.hash_bits_per_character = 5

; The URL rewriter will look for URLs in a defined set of HTML tags.
; form/fieldset are special; if you include them here, the rewriter will
; add a hidden <input> field with the info which is otherwise appended
; to URLs. If you want XHTML conformity, remove the form entry.
; Note that all valid entries require a "=", even if no value follows.
url_rewriter.tags = "a=href,area=href,frame=src,input=src,form=fakeentry"

I am using Linux, Apach, php 4

Thanks a lot for your efforts in advance.



 9:52 am on Feb 20, 2007 (gmt 0)

Hi, I think that your problem is, that $_SESSION['cart'][$bond] is always equal to 1, am I right?

This is because on start you are overwriting the values of that particular session:
$_SESSION['cart'] = array(
"10" => $q10,
"25" => $q25,
"50" => $q50,
"100" => $q100,
"250" => $q250,
"500" => $q500,

the session has just been overwritten with empty values, cause $q10... are not defined.

//$_SESSION['cart'][10] + 1 equals 1 (null + 1 = 1)
You can set that value with:

if(!isset($_SESSION['cart'])) $_SESSION['cart'] = array(
"10" => $q10,
"25" => $q25,
"50" => $q50,
"100" => $q100,
"250" => $q250,
"500" => $q500,

And it should work now.

PS. There was no need to post your php.ini


 9:20 am on Feb 22, 2007 (gmt 0)

Dear Michal,

First of all i want apologize for replying so late.

You don't know now thankful I am to you. You had solved my big problem. I was breaking my head over this problem from long time.

thanks a lot


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