wp_generate_attachment_metadata

Source code

function wp_generate_attachment_metadata( $attachment_id, $file ) {

	$attachment = get_post( $attachment_id );



	$metadata = array();

	if ( preg_match('!^image/!', get_post_mime_type( $attachment )) && file_is_displayable_image($file) ) {

		$imagesize = getimagesize( $file );

		$metadata['width'] = $imagesize[0];

		$metadata['height'] = $imagesize[1];

		list($uwidth, $uheight) = wp_constrain_dimensions($metadata['width'], $metadata['height'], 128, 96);

		$metadata['hwstring_small'] = "height='$uheight' width='$uwidth'";



		// Make the file path relative to the upload dir

		$metadata['file'] = _wp_relative_upload_path($file);



		// make thumbnails and other intermediate sizes

		global $_wp_additional_image_sizes;



		foreach ( get_intermediate_image_sizes() as $s ) {

			$sizes[$s] = array( 'width' => '', 'height' => '', 'crop' => FALSE );

			if ( isset( $_wp_additional_image_sizes[$s]['width'] ) )

				$sizes[$s]['width'] = intval( $_wp_additional_image_sizes[$s]['width'] ); // For theme-added sizes

			else

				$sizes[$s]['width'] = get_option( "{$s}_size_w" ); // For default sizes set in options

			if ( isset( $_wp_additional_image_sizes[$s]['height'] ) )

				$sizes[$s]['height'] = intval( $_wp_additional_image_sizes[$s]['height'] ); // For theme-added sizes

			else

				$sizes[$s]['height'] = get_option( "{$s}_size_h" ); // For default sizes set in options

			if ( isset( $_wp_additional_image_sizes[$s]['crop'] ) )

				$sizes[$s]['crop'] = intval( $_wp_additional_image_sizes[$s]['crop'] ); // For theme-added sizes

			else

				$sizes[$s]['crop'] = get_option( "{$s}_crop" ); // For default sizes set in options