php - Way to verify if variable is a valid GD image resource? -

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i have class accepts gd image resource 1 of arguments. far know, there no way type hint since resource , not object. there way validate whether supplied argument valid gd image resource (aside further functionality using resource failing)?

ps: please not mention imagemagick in answer...

the get_resource_type function should out. short of writing code , seeing return, i'm not sure it's going gd resource, you're on own there. should starting point, though!


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