apply_filters( ‘image_editor_output_format’, string[] $output_format, string $filename, string $mime_type )

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   Adam Silverstein 1 year ago

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   Use this filter to output WebP images when users upload JPEG images:

   function map_jpeg_to_webp( $mappings ) {
   	$mappings[ 'image/jpeg' ] = 'image/webp';
   	return $mappings;
   };
   add_filter( 'image_editor_output_format', 'map_jpeg_to_webp' );