ImageMagick : ImageCoderSignatureMismatch `miff' - php

Question

I've updated my version of ImageMagick and its bindings for PHP.
I've installed ImageMagick-7.0.4-9-Q16-x64,
and php_imagick-3.4.3-7.0-nts-vc14-x64,
running on PHP 7.0.10.
The command-line seems to work well since I've managed to execute a simple magick convert image.png -resize 50% imageSmall.png successfully.
The problem is that a PHP script who ran successfully on ImageMagick 6.8.x (I don't remember very well), but can't do it with this version.
It gave me the following error :
ImageCoderSignatureMismatch `miff': 210 != 610 # error/module.c/OpenModule/1342
Sometimes it shows me Unable to set the image format instead, I don't really know why.
I've found where in my code this error was triggered :
public function init(){
var_dump('begin init fcrender canvas');
if($this->_canvas == null){
$this->_canvas = new Imagick();
/////// It's the following line :
$this->_canvas->newImage($this->_width, $this->_height, 'transparent', 'miff');
/////////////////////////////////
$this->_filename = 'image';
$this->_extension = 'png';
}
}
So why does this error come from ? Thanks you for your help ! :)

Answer 1

This means that the wrong module was loaded. The 210 != 610 are the version signature of the miff module, so IM 7 is expected miff 610, but IM 6's 210 was loaded.
A couple options to fix.
Uninstall all ImageMagick 6 resources.
Reinstall ImageMagick 7 to an isolated location, and use $MAGICK_HOME environment variable.
Define MAGICK_CODER_MODULE_PATH environment variable to correct module path.
More info # Resources documentation.

Answer 2

I think php_imagick is simply not compatible with ImageMagick7.x.x.
I downloaded and installed ImageMagick6.9.3 that I found here : http://windows.php.net/downloads/pecl/deps/
(To install, I simply the folder in C:\imagemagick\ and put the content of "bin\" at the top-level, in C:\imagemagick\.
Then I copied all the CORE_RL_*.dll in C:\wamp64\bin\apache\apache2.4.23\bin\ .)
This works perfectly in PHP 7.0.10 with imagick3.4.3 downloadable here : https://pecl.php.net/package/imagick
Thank you for your help guys !