Setting character encoding for all layers at once using PyQGIS?

I have to set the character encoding for all layers from system to UTF-8.

Is there a way to change this in all loaded layers at once?

I'm using QGIS 2.8.1 on Windows 7.

Answer

You can use the following which should set the encoding of your loaded layers to UTF-8:

for layer in QgsMapLayerRegistry.instance().mapLayers().values():
    layer.setProviderEncoding(u'UTF-8')
    layer.dataProvider().setEncoding(u'UTF-8')
    print layer.name(), layer.dataProvider().encoding()   #Optional check: prints layer name and its encoding source

Remember to save your project file (.qgs) afterwards.

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Edit:

As suggested by @meles, you can input the above code into the Python Console (Plugins > Python Console; Extensions > Python Console; Ctrl + Alt + P).

Hope this helps!