Copy an existing image file.

Retrieve the path or URL of an attachment’s attached file.

Updates the attached file and image meta data when the original image was edited.

Low-level function to create image sub-sizes.

Validate that file is suitable for displaying within a web page.

Validate that file is an image.

Load an image resource for editing.

Creates image sub-sizes, adds the new data to the image meta sizes array, and updates the image metadata.

Crops an image to a given size.

Convert the exif date format to a unix timestamp.