# Imagecreatefrompng() function in php

1. May 28, 2007

### Math Is Hard

Staff Emeritus
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 (Text):

#!/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 (Text):

<HTML>
<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.

2. May 28, 2007

### NoTime

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. May 29, 2007

### Math Is Hard

Staff Emeritus
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: May 29, 2007