WordPress at a glance
filter is not described

image_resize_dimensions filter-hook . WP 3.4.0

Filters whether to preempt calculating the image resize dimensions.

Passing a non-null value to the filter will effectively short-circuit image_resize_dimensions(), returning that value instead.

Usage

add_filter( 'image_resize_dimensions', 'filter_function_name_3735', 10, 6 );
function filter_function_name_3735( $null, $orig_w, $orig_h, $dest_w, $dest_h, $crop ){
	// filter...

	return $null;
}
$null(null/mixed)
Whether to preempt output of the resize dimensions.
$orig_w(int)
Original width in pixels.
$orig_h(int)
Original height in pixels.
$dest_w(int)
New width in pixels.
$dest_h(int)
New height in pixels.
$crop(true/false/array)
Whether to crop image to specified width and height or resize. An array can specify positioning of the crop area.
Default: false

Where the hook is called

image_resize_dimensions()
wp-includes/media.php 523
$output = apply_filters( 'image_resize_dimensions', null, $orig_w, $orig_h, $dest_w, $dest_h, $crop );

Where the hook is used (in WP core)

Does not used.