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Posted by Joseph Melnick on 06/14/05 17:36
Hello Darren,
PHP is complaining that you do not have a get variable called cat_id in your
request ( eg: script.php?cat_id=3 )
so what my added statement is doing is saying if cat_id exists in the $_GET
array AND it is equal to your internal $cat_id variable then execute a bunch
of statements.
if cat_id does not exist in the $_GET array then do not evaluate it and move
on and execute statements after the IF.
Help this helps.
Joseph Melnick
JM Web Consultants
http://www.jphp.com/
"darren" <darren@NOSPAMemdnet.co.uk> wrote in message
news:d8mn7q$8rc$1@nwrdmz03.dmz.ncs.ea.ibs-infra.bt.com...
> Thanks Joseph,
>
> Don't really understand what I've done but it works.
>
> Darren
>
> "Joseph Melnick" <jmelnick@jphp.com> wrote in message
> news:U-udnXX38YCZVTPfRVn-rA@rogers.com...
>> Hello Darren,
>>
>> I think that the offending line Is the If statement below as
>> $_GET["cat_id"] may not exist:
>> if ( $_GET["cat_id"] == "$cat_id") {
>>
>> to fix this you could use a statement like th one below.
>> if (array_key_exists("cat_id",$_GET) and $_GET["cat_id"] ==
>> "$cat_id") {
>>
>> Cheers
>>
>> Joseph Melnick
>> JM Web Consultants
>> http://www.jphp.com/
>>
>>
>>
>>
>> "darren" <darren@NOSPAMemdnet.co.uk> wrote in message
>> news:d8mcf1$4vk$1@nwrdmz03.dmz.ncs.ea.ibs-infra.bt.com...
>>> Thanks,
>>>
>>> I put the quotes in and I am now left with 3 error messages:-
>>>
>>> Notice: Undefined index: cat_id in c:\program
>>> files\easyphp1-7\www\phpshop\seestore.php on line 26
>>>
>>> Notice: Undefined index: cat_id in c:\program
>>> files\easyphp1-7\www\phpshop\seestore.php on line 26
>>>
>>> Notice: Undefined index: cat_id in c:\program
>>> files\easyphp1-7\www\phpshop\seestore.php on line 26
>>>
>>>
>>> <?php
>>> //connect to database
>>> $conn = mysql_connect("localhost", "darrenludlam", "dazza5972") or
>>> die(mysql_error());
>>> mysql_select_db("phpshop",$conn) or die(mysql_error());
>>>
>>> $display_block = "<h1>My Categories</h1>
>>> <P>Select a category to see its items.</p>";
>>>
>>> //define variables
>>> //$cat_id="0";
>>>
>>> //show categories first
>>> $get_cats = "select id, cat_title, cat_desc from store_categories order
>>> by cat_title";
>>> $get_cats_res = mysql_query($get_cats) or die(mysql_error());
>>>
>>> if (mysql_num_rows($get_cats_res) < 1) {
>>> $display_block = "<P><em>Sorry, no categories to browse.</em></p>";
>>> } else {
>>> while ($cats = mysql_fetch_array($get_cats_res)) {
>>> $cat_id = $cats["id"];
>>> $cat_title = strtoupper(stripslashes($cats["cat_title"]));
>>> $cat_desc = stripslashes($cats["cat_desc"]);
>>>
>>> $display_block .= "<p><strong><a
>>> href=\"$_SERVER[PHP_SELF]?cat_id=$cat_id\">$cat_title</a></strong><br>$cat_desc</p>";
>>>
>>> if ($_GET["cat_id"] == "$cat_id") {
>>> //get items
>>> $get_items = "select id, item_title, item_price from
>>> store_items where cat_id = $cat_id order by item_title";
>>> $get_items_res = mysql_query($get_items) or
>>> die(mysql_error());
>>>
>>> if (mysql_num_rows($get_items_res) < 1) {
>>> $display_block = "<P><em>Sorry, no items in this
>>> category.</em></p>";
>>> } else {
>>> $display_block .= "<ul>";
>>>
>>> while ($items = mysql_fetch_array($get_items_res)) {
>>> $item_id = $items[id];
>>> $item_title = stripslashes($items[item_title]);
>>> $item_price = $items[item_price];
>>>
>>> $display_block .= "<li><a
>>> href=\"showitem.php?item_id=$item_id\">$item_title</a></strong>
>>> (\$$item_price)";
>>> }
>>>
>>> $display_block .= "</ul>";
>>> }
>>> }
>>> }
>>> }
>>> ?>
>>> <html>
>>> <HEAD>
>>> <TITLE>My Categories</TITLE>
>>> </HEAD>
>>> <BODY>
>>> <? print $display_block; ?>
>>> </BODY>
>>> </HTML>
>>>
>>> Many thanks
>>>
>>> Darren
>>>
>>> "rush" <pipa@rush.avalon.hr> wrote in message
>>> news:d8m8j9$b9i$1@ss405.t-com.hr...
>>>> "darren" <darren@NOSPAMemdnet.co.uk> wrote in message
>>>> news:d8m3nf$bau$1@nwrdmz01.dmz.ncs.ea.ibs-infra.bt.com...
>>>>> Hello I have just copied the code below from a book and I get the
>>>> following
>>>>> errors but the code does actually work. Is it a problem with relative
>>>>> paths?
>>>>
>>>> nope, it is problem with undeclared string constants.
>>>>
>>>> Older versions of php would let you write something like:
>>>>
>>>> $a = some_my_stuff ;
>>>>
>>>> if some_my_stuff was not declared at this point as constant, php would
>>>> autodeclare it to be 'some_my_stuff'
>>>>
>>>> So number of people got used to write some simple string constants
>>>> (like
>>>> some_my_stuff) without quotes, which was rather sloppy habit. To
>>>> mittigate
>>>> situations never versions of php started complaining about it.
>>>>
>>>> Best thing you can do is to go through your list of errors, and on each
>>>> line
>>>> mentioned you will find some unquoted string constant (also mentioned
>>>> in
>>>> error message). Put quotes aroind it, and you are done.
>>>>
>>>> rush
>>>> --
>>>> http://www.templatetamer.com/
>>>> http://www.folderscavenger.com/
>>>>
>>>>
>>>
>>>
>>
>>
>
>
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