Test of lib gd version.

kult

Hello,

I do this to test the version of lib gd installed on the server:

 if( (function_exists("imagecreatetruecolor")) &&
          (function_exists("imagecopyresampled")) ) {
        $out = imagecreatetruecolor( $s0x, $s0y) ;
        imagecopyresampled ($out, $pic, 0, 0, 0, 0, $s0x, $s0y, $sizex, $sizey) ;
      }else {
        $out = imagecreate( $s0x, $s0y) ;
      imagecopyresized($out, $pic, 0, 0, 0, 0, $s0x, $s0y, $sizex, $sizey) ;

}

And even if the lib gd is in version 1, it enters in the if and output the following insult:
Fatal error: imagecreatetruecolor(): requires GD 2.0 or later in index.php on line 22

Why it enters in the if, why does the function exist if the function is not available ?

Any idea to test if the functions imagecreatetruecolor and imagecopyresampled are available ?

What's more, the function gd_info() does not exist on most servers:
http://defacta.nexenservices.com/test.php

Thanks,
Vincent.

Mordecai

I think GD is a little weird when it comes to versions. It seems the older versions had the newer versions in mind. That is to say, they defined all the functions before they wrote the code for them. This means the functions exist to PHP, but they do not actually do anything. All they do is echo out the error.
I don't think there's any way around this, rather than to check what the response is.

kult

I've found a solution, it might not be the most optimized one ! ;-)

if(@imagecreatetruecolor(0,0)) {
  $out = imagecreatetruecolor( $s0x, $s0y) ;
  imagecopyresampled ($out, $pic, 0, 0, 0, 0, $s0x, $s0y, $sizex, $sizey) ;
}else {
  $out = imagecreate( $s0x, $s0y) ;
  imagecopyresized($out, $pic, 0, 0, 0, 0, $s0x, $s0y, $sizex, $sizey) ;
}

Any suggestion to find any better way ? :-)

Mordecai

This is off of the user notes at PHP.net:

brad at brwebdesign dot com
25-May-2002 03:26

I came up with this today. You need GD2.0 or greater to use imagecreatetruecolor so you can parse phpinfo to get the needed information. this will have to go at the very top of the page with no whitespace above it

<?php
ob_start();
phpinfo(8);
$phpinfo=ob_get_contents();
ob_end_clean();
$phpinfo=strip_tags($phpinfo);
$phpinfo=stristr($phpinfo,"gd version");
$phpinfo=stristr($phpinfo,"version");
$end=strpos($phpinfo," ");
$phpinfo=substr($phpinfo,0,$end);
$phpinfo=substr($phpinfo,7);
if(version_compare("2.0", "$phpinfo")==1)
echo "you have a version less then 2";
?>

The if statement is for PHP 4.1 or greater, but you can use other methods of comparing the version numbers if the server you are on do not have that version of php