Can I arbitrarily set $_FILE global

I have a function, not coded by me that uses the super global $_FILE['picture'][开发者_JAVA百科'temp_name'] to create an image file and thumbnails. However, when a user does not upload an image, no image nor thumbnails get created, and another application that uses these images for display gets messed up.

So, when a user does not upload an image, I would like to arbitrarily set $_FILE['picture']['temp_name'] to an image stored in the server, and passed $_FILE['picture']['temp_name'] to the function I first mentioned.

My question is, can I arbitrarily set the super global $_FILE['picture']['temp_name'] = file_path/preset_image.jpg ?

Thank you,

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Yes you can, though it is generally not recommended (only as a hack to get around existing software limitations, like the ones you described).