New and updated in 5.8.1
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Returns the default compression quality setting for the mime type.
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function_wp_check_alternate_file_names()
Helper function to test if each of an array of file names could conflict with existing files.
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Returns first matched extension for the mime-type, as mapped from wp_get_mime_types().
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Filters the result when generating a unique file name.
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functionget_theme_feature_list()
Retrieves list of WordPress theme features (aka theme tags).