WordPress at a glance
function is not described

_copy_image_file() WP 3.4.0

Copy an existing image file.

No Hooks.

Return

String/false. New file path on success, false on failure.

Usage

_copy_image_file( $attachment_id );
$attachment_id(string) (required)
Attachment ID.

Code of copy image file: wp-admin/includes/image.php VER 5.1.1

<?php
function _copy_image_file( $attachment_id ) {
	$dst_file = $src_file = get_attached_file( $attachment_id );
	if ( ! file_exists( $src_file ) ) {
		$src_file = _load_image_to_edit_path( $attachment_id );
	}

	if ( $src_file ) {
		$dst_file = str_replace( basename( $dst_file ), 'copy-' . basename( $dst_file ), $dst_file );
		$dst_file = dirname( $dst_file ) . '/' . wp_unique_filename( dirname( $dst_file ), basename( $dst_file ) );

		/*
		 * The directory containing the original file may no longer
		 * exist when using a replication plugin.
		 */
		wp_mkdir_p( dirname( $dst_file ) );

		if ( ! @copy( $src_file, $dst_file ) ) {
			$dst_file = false;
		}
	} else {
		$dst_file = false;
	}

	return $dst_file;
}