gd library

poncho4u

I am using php 4.0.1 and I want to draw a bargraph representing some data. However php spits out an error message:
call to undefined function imagecreate()
What could be the cause? Is it tha tthe gd library does not come the gd library included?

ednark

if all you want is a bargraph... you can do this in html only

make each bar a TD of one row... actually a DIV inside the TD

set the DIV width=30 or whatever
and the DIV height to that % that the bar is worth
set the TABLE height to whatever max pixel hight you want

<table height="100">
 <tr>
  <td>
        <div height="10%"
             width="20"
             bgcolor="green"><img src="1x1_clear_spacer.gif" /></div>
  </td>
  <td>
        <div height="50%"
             width="20"
             bgcolor="blue"><img src="1x1_clear_spacer.gif" /></div>
  </td>
  <td>
        <div height="40%"
             width="20"
             bgcolor="red"><img src="1x1_clear_spacer.gif" /></div>
  </td>
</tr>
</table>

and set your colors in html... viola much easier than a GD library...

if you even feel more feisty you can actually calculate out the div height in pixels or each bar to make things more solid

however... you may have other reasons for wanting an image of some sort... but just in case i thought i might offer my solution

d-MoN

yes you can make it thru html.

as for gd lib - you have to include it yourself (edit php.ini, check the paths and check that php_gd.dll or whatever is where it should be). The same goes for other modules which aren't included into standard php build.

poncho4u

But how do u configure php to use the gd library?there is nothing like
php_gd.dll in the php.ini file.The reason why I wanted to use the gd library
is to create the bargraph which uses some php numerical variables as variables
for the graph.

slevytam

I am still trying to get this to work myself; however, php_gd.dll is in the php.ini.

Look for a line similar to this:

;extension=php_gd.dll

--SL

Weedpacket

Originally posted by poncho4u
But how do u configure php to use the gd library?there is nothing like
php_gd.dll in the php.ini file.The reason why I wanted to use the gd library
is to create the bargraph which uses some php numerical variables as variables
for the graph.

If you're using a Unix-based system you'll need to (a) get gd-lib (the manual says where from on the page where it lists the image functions), (b) reconfigure and recompile PHP (and probably your server, too).

If you like, you could consider this an opportunity to upgrade to a much more recent version of PHP.

But you're still perfectly capable of using ednark's suggestion; he just put in some actual numbers for appearance. He didn't intend for you to blindly stick that HTML in the page, it's just a sample of the sort of thing you'd have PHP generate (whatever the actual numbers may be).