If you want to stop Photos app from automatically opening when plug in your iPhone, you just need to uncheck the box located in front of "Open Photos for this device" under the "Import" tab of Photos app. If you turn this feature Off, you will have to manually transfer photos from an iPhone, SD card, camera to the Mac Photos app. But, it does not stop the Photos app from working with the device. It just prevent the Photos app from opening itself automatically in OS X.
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