Description:
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I tried to use the imageistruecolor() function, but it didn't work, the errormessage PHP returned was:

Fatal error:  Call to undefined function:  imageistruecolor() in ...etc...

I checked the documentation and it said (PHP 4 >= 4.3.2, PHP 5), and i have 4.3.4

Reproduce code:
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Header("Content-type: image/jpeg"); 
$im = imagecreatefromjpeg("test.jpg"); 
imageinterlace($im, 1);
//Imagejpeg($im,'',100); 
print imageistruecolor($im);
ImageDestroy($im); 

Expected result:
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boolean (i think 0 since test.jpg is not true color i think, not sure, thats why i wanted to use this function in the first place :-))

Actual result:
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<br />
<b>Fatal error</b>:  Call to undefined function:  imageistruecolor() in <b>c:\webserver\htdocs\test.php</b> on line <b>10</b><br />