global variabe to geting set

[inusrat]

Hi,

I have put the page navigation at the bottom of

http://www.test420.biz/products.php

I got this code fro some place, and everything working fine, except that they are defining a global variable called "Start" which seems to be not working, it always have a value zero., because of which page navigation not working.. here is the whole code

<?php

$numentries=3;
//declares number of entries per page to display
global $start;
//declares start as a global variable
if(!isset($start))
{
$start=0;
//if start is not set, set it to zero
}

echo "Start value coming as -- $start";

$link = mysql_connect("localhost","root", "786sheikh")
or die("Couldn't make connection.");
mysql_select_db("small_store",$link)
or die("Couldn't select database.");
$result= mysql_query("SELECT * FROM products order by gender DESC LIMIT $start,$numentries")
or die("Couldn't execute query");
while($row = mysql_fetch_array($result)) {

$product_name = $row["product_name"];
$product_image = $row["product_image"];
$product_price = $row["product_price"];
$product_desc = $row["product_desc"];
$size_flag = $row["size_flag"];

echo " <table BORDER='0' CELLPADDING=5 CELLSPACING=0 width=100%><tr><td><table><tr><td valign=top><img src=productimages/$product_image border=0 width=72 height=72 > </td><td valign=top class=HeaderRow2><b>$product_name</b><br><font face=Verdana, Arial, Helvetica, sans-serif size=1 color=black>$product_desc<br><b>Price:&nbsp;</b>$$product_price<br><b>Size:&nbsp;</b>$size_flag</font></td></tr></td></table></tr><tr><td height=3 ></td></tr><TR bgcolor=brown><td valign=TOP HEIGHT=0></TD></TR></table>";

}

$d=0;
$f=0;
$g=1;

$r="SELECT*from products";
$r2=mysql_query($r);
while($order3=mysql_fetch_array($r2))
{
if($f%$numentries==0)
{
print "<A href='products.php?start=$d'>$g</a> ";
$g++; }
$d=$d+1;
$f++;
}

?>

http://www.786Marriage.com

http://www.amasspharma.com

http://www.ambdex.com

 

[sleipnir214]

The "global" directive only has meaning inside a function definition. At the level at which the global directive appears in your script, the directive has no meaning.


The reason $start has no value is probably that your PHP installation has register_globals set to "off". Edit your script to change every reference to $start to a reference to $_GET['start'].

See Section 1.1 of faq434-2999 for more information


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[inusrat]

Is this true that in PHP if you have this kind of statment


*********
$begin=$_GET['start'];
**************

Then you make sure that you are receiving the variable "start"
through your suppose hyper link or submitted form otherwise it will give you error, like the following

Notice: Undefined index: start in C:\Inetpub\

http://wwwroot\TopFactoryOutlet\products.php

on line 122

beacuse I took out global variable
instead i am doing

$begin=$_GET['start'];

my page navigation works now,
but when i hit the page very first time, i get this error, i think the reason being that first time in my URL i do not have the variabkle "start" which

$begin=$_GET['start'];

excepting and that why it gives me this error.
unlike in ASP it just ignores if the URL does not have the variable it is trying to get

Tab= request("tab")


thanks

http://www.786Marriage.com

http://www.amasspharma.com

http://www.ambdex.com

 

[sleipnir214]

When you say "ASP", do you mean "VBScript/ASP"? Because ASP is just a object framework, not a programming language. If you are talking about VBScript/ASP, I'm no longer familiar enough with the product to comment on its behavior.


In PHP it is a very simple thing to check that a variable exists before you try to use it.

Take a look at isset() or array_key_exists(). Wrap an if-statement around your assignment statement and you won't ever get the error.


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