Imagecreatefrompng() function in php

  • #1
Math Is Hard
Staff Emeritus
Science Advisor
Gold Member
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I was experimenting with the imagecreatefrompng() function in php. There was an example here:
http://us2.php.net/imagecreatefrompng

I tried to modify it to use an image called full.png in my img folder.

aaaimage.php
Code:
#!/usr/local/bin/php
<?php

function LoadPNG($imgname) 
{
    $im = @imagecreatefrompng($imgname); /* Attempt to open */
    if (!$im) { /* See if it failed */
        $im  = imagecreatetruecolor(150, 30); /* Create a blank image */
        $bgc = imagecolorallocate($im, 255, 255, 255);
        $tc  = imagecolorallocate($im, 0, 0, 0);
        imagefilledrectangle($im, 0, 0, 150, 30, $bgc);
        /* Output an errmsg */
        imagestring($im, 1, 5, 5, "Error loading $imgname", $tc);
    }
    return $im;
}
header("Content-Type: image/png");
$img = LoadPNG("img/full.png");
imagepng($img);

?>
I'm not sure what to do with the HTML. I tried the simplest idea:
display.htm
Code:
<HTML>
<HEAD></HEAD>
<BODY>
This is a test.<BR/>
<img src="aaaimage.php" />
</BODY>
</HTML>
But that does nothing. I just get a broken image tag. I am not really clear on what the function returns, they say it is an

"image identifier" but I don't know what that means.

Any advice? Thanks.:smile:
 

Answers and Replies

  • #2
NoTime
Science Advisor
Homework Helper
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0
Here is a lot of commentary on this function.
Apparently there is only one error return.
Scroll down a bit. The page looks blank, but isn't.

http://us.php.net/imagecreatefrompng
 
  • #3
Math Is Hard
Staff Emeritus
Science Advisor
Gold Member
4,527
28
thanks. I've been through the commentary but still haven't solved my problem. I think I might try the jpeg version of this function and see if I have any more luck. I was hoping if I was doing something stupid in my code it would be glaringly apparent and I could correct it, but it sounds like this is just going to be a complicated function to work with.
 
Last edited:

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