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> Saving A Php Generated Image To The Server, Help Needed Please
vujsa
post Sep 19 2005, 11:38 AM
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I'm trying to create a script that will generate an image and send it back to the browser while saving the same image to the server. I'm doing this because the image should be dynamically generated but because of the load that would place on a server if the image happened to be requested frequently, I've decided to build in a means to serve the static version of the image most of the time.
What isn't included here is the function that will check the age of the file in cache directory and serve the static image if it is less than an hour old. This isn't really needed to get this part of the script working so to prevent making the code more complicated, I left it out. I'm having trouble saving the generated image to the server. I have finally gotten it to save the file but it is saving the data as text and not as a PNG image file.

Here is the script as it is currently written:
CODE
<?php
// Designate a background image
 $background = imagecreatefrompng("background001.png");

// Designate a foreground image
 $insert = imagecreatefrompng("token001.png");

// Select the origin pixel of the foregrounf image as the transparent color
 imagecolortransparent($insert,imagecolorat($insert,0,0));

// Get dimisions of the foreground image
 $insert_x = imagesx($insert);
 $insert_y = imagesy($insert);

// Place the foreground image on the background image
 imagecopymerge($background,$insert,345,72,0,0,$insert_x,$insert_y,100);

// Insert Text into the image
 $text = $_GET['action'];
 $red =  imagecolorallocate($background, 255, 0, 0);
 $font = "verdana.ttf";
 imagettftext($background, 14, 0, 238, 90, $red, $font, $text);
 imagettftext($background, 8, 0, 238, 125, $red, $font, mktime());

// Start the content buffer to hold information prior to saving
 ob_start();

// Set the header information of the image
 header ("Content-type: image/png");
 header('Content-transfer-encoding: binary');

// Output a png image
 imagepng($background,'',100);

//Assign a variable to hold the buffer information and clear/close buffer
 $output = ob_get_clean();

// Clear computer memory of image data
 imagedestroy($background);

// Output the buffer information to browser
 echo $output;

// Open or create a file and write buffer information to it.
 $cachefile = "cache/test001.png";
 $handle = fopen($cachefile, "w+b");
 fwrite($handle, $output);

// Close file
 fclose($handle);

?>


Here is the output shown of test001.png:
CODE
PNG



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Anyone know how to successfully generate and save an image file using PHP?

Thanks for any help you can give. cool.gif

vujsa
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mastercomputers
post Sep 19 2005, 11:57 AM
Post #2


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Member No.: 27
Hey vujsa,

Simple error, this line:

$handle = fopen($cachefile, "w+b");

Should be:

$handle = fopen($cachefile, 'wb');

That should be it.

Other than that, I would probably have to test it out myself.


Cheers,


MC
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vujsa
post Sep 19 2005, 12:21 PM
Post #3


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Well, that didn't fix the bug. I'm still getting trash instead of the image.

Any ideas?

vujsa
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vizskywalker
post Sep 19 2005, 08:55 PM
Post #4


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Instead of using fwrite() to create the png, you need t use imagepng as what you are actually saving is an image resource, not the png image. Simply use this format: imagepng($image, $filename) where $image is the png image resource and $filename is the name of the file you want to save it to.

~Viz
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vujsa
post Sep 19 2005, 11:10 PM
Post #5


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Okay everyone, false alarm.

The problem wasn't in the code but instead was in a .htaccess two directories above the image to be shown. I forgot to delete the .htaccess that redirected .png file extensions to the PHP engine after I replaced that set up. I now use a diferent means to mask urls.

Everything is working fine now with out the need to use any file system functions ot object buffering.

Basically, to print to file use:
imagepng($image, 'path/to/file.png');

and to print to browser use:
imagepng($image, '');

hope this helps everyone.

vujsa
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vizskywalker
post Sep 20 2005, 12:12 AM
Post #6


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That's what I said vujsa! Glad it's working now. If anymore problems arise just post back here.

~Viz
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