Registers an image size for the post thumbnail.

• add_image_size() : for details on cropping behavior.

$width int Required

Image width in pixels.

$height int Required

Image height in pixels.

$crop bool|array Optional

Whether to crop images to specified width and height or resize.
An array can specify positioning of the crop area.

Default: false

• To register additional image sizes for Featured Images use: add_image_size() .
• To enable featured images, the current theme must include add_theme_support( 'post-thumbnails' ); in its functions.php file. See also Post Thumbnails.
• This function will not resize your existing featured images. To regenerate existing images in the new size, use the Regenerate Thumbnails plugin.

File: wp-includes/media.php. View all references

function set_post_thumbnail_size( $width = 0, $height = 0, $crop = false ) {
	add_image_size( 'post-thumbnail', $width, $height, $crop );
}