PNG files won't upload - php

Question

I have the following script that I use to upload pictures; This file works with every other file extension except for PNG files. Is there any reason?
This is my script;
// initialization
$result_final = "";
$counter = 0;
// List of our known photo types
$known_photo_types = array(
'image/pjpeg' => 'jpg',
'image/jpeg' => 'jpg',
'image/gif' => 'gif',
'image/bmp' => 'bmp',
'image/x-png' => 'png');
// GD Function Suffix List
$gd_function_suffix = array(
'image/pjpeg' => 'JPEG',
'image/jpeg' => 'JPEG',
'image/gif' => 'GIF',
'image/bmp' => 'WBMP',
'image/x-png' => 'PNG');
// Fetch the photo array sent by preupload.php
$photos_uploaded = $_FILES['photo_filename'];
// Fetch the photo caption array
$photo_caption = $_POST['photo_caption'];
while( $counter <= count($_FILES['photo_filename']['tmp_name']) )
{
if($photos_uploaded['size'][$counter] > 0)
{
if(!array_key_exists($photos_uploaded['type'][$counter], $known_photo_types))
{
$result_final .= "File ".($counter+1)." is not a photo!<br />";
}else{
mysql_query( "INSERT INTO database(`filename`, `caption`, `category`, `id`) VALUES('0', '".addslashes($caption[$counter])."', '".addslashes($_POST['category'])."', '".addslashes($_POST['id'])."')" );
$new_id = mysql_insert_id();
$filetype = $photos_uploaded['type'][$counter];
$extention = $known_photo_types[$filetype];
$filename = $new_id.".".$extention;
#mysql_query( "UPDATE database SET photo_filename='".addslashes($filename)."' WHERE photo_id='".addslashes($new_id)."'" );
// Store the orignal file
copy($photos_uploaded['tmp_name'][$counter], $images_dir2."/".$filename);
// Let's get the original image size
$size = GetImageSize( $images_dir2."/".$filename );
// .................................................................................
// Lets resize the image if its width is greater than 500 pixels
// Resized image settings
if ($size[0] > '1'){
$Config_width_wide = 800; // width of wide image
$Config_height_wide = 800; // height of wide image
$Config_width_tall = 800; // width of tall image
$Config_height_tall = 800; // height of tall image
// The Code
if($size[0] > $size[1]){
$image_width = $Config_width_wide;
$image_height = (int)($Config_width_wide * $size[1] / $size[0]);
if($image_height > $Config_height_wide){
$image_height = $Config_height_wide;
$image_width = (int)($Config_height_wide * $size[0] / $size[1]);
}
}else{
$image_width = (int)($Config_height_tall * $size[0] / $size[1]);
$image_height = $Config_height_tall;
if($image_width > $Config_width_tall){
$image_width = $Config_width_tall;
$image_height = (int)($Config_width_tall * $size[1] / $size[0]);
}
}
// Build image with GD 2.x.x, you can use the other described methods too
$function_suffix = $gd_function_suffix[$filetype];
$function_to_read = "ImageCreateFrom".$function_suffix;
$function_to_write = "Image".$function_suffix;
// Read the source file
$source_handle = $function_to_read ( $images_dir2."/".$filename );
if($source_handle){
// Let's create a blank image for the image
$destination_handle = ImageCreateTrueColor ( $image_width, $image_height );
// Now we resize it
ImageCopyResampled( $destination_handle, $source_handle, 0, 0, 0, 0, $image_width, $image_height, $size[0], $size[1] );
}
// Store the orignal file
copy($photos_uploaded['tmp_name'][$counter], $images_dir2."/".$filename);
// Let's save the image
if ($extension == 'png') {
$function_to_write( $destination_handle, $images_dir2."/".$filename, 9 );
} else {
$function_to_write( $destination_handle, $images_dir2."/".$filename, 90 );
}
ImageDestroy($destination_handle );
}
}
}
$counter++;
}
} else exit('<p>Error: ' .
mysql_error() . '</p>');
Thats my code and everything works fine when I upload a jpeg or gif file but when I upload a png file, it doesn't work. I don't get no error neither. Please, what could be the error?

Answer 1

Merely change it to:
image/png

Answer 2

png is an officially recognized mime type, it should be just image/png. the x- prefix is for experimental/unofficial types. You could trivially verify what you're getting with var_dump($_FILES).
Your upload handling code also needs updates. You do not check for successful uploads, and simply assume they succeeded. NEVER assume success.
if($_FILES['photo_filename']['error'] !== UPLOAD_ERR_OK) {
die("Upload failed with error code " . $_FILES['photo_filename']['error']);
}
addslashes() is utterly useless pointless garbage. It does NOTHING to protect you against sql injection attacks. If you insist on continuing to use the deprecated mysql_*() functions, then at least use the proper mysql_real_escape_string().