imagecopyresampled(): supplied resource is not a valid Image resource

[JakeAi]

I have tried multiple code setups for the image class and I cannot get it working, the way I need it to. I can do one file at a time. If I want to create thumbnails it errors. These are the setups I've tried. I have been digging through the class trying to find where it goes wrong, but I can't find it anywhere.

foreach ($this->sizes as $size) {
	$copyImage = \Config\Services::image( 'gd' )
			->withFile( "{$folderPath}/{$filename}.{$extension}" )
			->resize( $size, $size )
			->save( "{$folderPath}/{$filename}x{$size}.{$extension}" );
}

$copyImage = \Config\Services::image( 'gd' );
foreach ($this->sizes as $size) {
	$copyImage->withFile( "{$folderPath}/{$filename}.{$extension}" )
			->resize( $size, $size )
			->save( "{$folderPath}/{$filename}x{$size}.{$extension}" );
}

[lonnieezell]

I won't have time to look into this until later today, but I would guess it's due to how you're calling \Config\Services::image( 'gd' ). That will return a shared instance by default. Try this:

\Config\Services::image( 'gd', null, false)

[JakeAi]

\Config\Services::image( 'gd', null, false)

Is what I ended up doing. But I feel like withFile would basically "refresh" that class? I felt it was a hacky way of doing it. This is how I was using it in my code. I spent a few hours getting it to "work". I left that area alone and I'll look into later.

$handler = \Config\Services::image( 'gd', null, false )
                            ->withFile( "{$folderPath}/{$this->fileName}.{$this->extension}" );

        $info = $this->handler->getFile()
                              ->getProperties( true );

        if ($info['width'] <= $info['height']) {
            $width = $info['width'];
            $height = $info['width'];
        } else {
            $width = $info['height'];
            $height = $info['height'];
        }

        $xOffset = ( $info['width'] / 2 ) - ( $width / 2 );
        $yOffset = ( $info['height'] / 2 ) - ( $height / 2 );

        $handler->withFile( "{$folderPath}/{$this->fileName}.{$this->extension}" )
                      ->crop( $width, $height, $xOffset, $yOffset )
                      ->resize( 500, 500 )
                      ->save( "{$folderPath}/thumb_{$this->fileName}.{$this->extension}" );

        $this->thumbnail = "{$this->webPath}/thumb_{$this->fileName}.{$this->extension}";

        foreach ($this->sizes as $size) {
            $this->{'x' . $size} = "{$this->webPath}/{$this->fileName}x{$size}.{$this->extension}";
            $handler = \Config\Services::image( 'gd', null, false )
                                             ->withFile( "{$folderPath}/{$this->fileName}.{$this->extension}" )
                                             ->resize( $size, $size )
                                             ->save( "{$folderPath}/{$this->fileName}x{$size}.{$this->extension}",100 );

        }

        return $this;

[lonnieezell]

You're right, it does make sense. And looking at the code, withFile should refresh, since it creates a new image. Looking deeper, though, it looks like the $resource value isn't reset during the withFile call, which is probably why it's always using the same file. I'll push a fix for that momentarily.