How to compare the original file and replacing file to upload prior to the action of physical uploading?

Exploiting the file_save_upload functions options, i would like to give a different treatment to the file on media replace.

  • if the new file to upload has the same uri than the existing, i would like to use FILE_EXISTS_REPLACE
  • if the new file to upload has a different URI, i would like to use FILE_EXISTS_RENAME

something like:

/**  * Custom validate handler for media entity edit form submissions.  */ function hook_validate($form, FormStateInterface $formState) {   //if replacement file has same uri as original        $replacementFile = file_save_upload('replacement_file', $uploadValidators, $uploadDestination, 0, FileSystemInterface::EXISTS_RENAME);   //else        $replacementFile = file_save_upload('replacement_file', $uploadValidators, $uploadDestination, 0, FileSystemInterface::EXISTS_REPLACE); } 
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How to compare the original file and replacing file to upload prior to the action of physical uploading?

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