set_post_thumbnail_size() WP 1.0

Registers an image size for the post thumbnail.

No Hooks.

Return

Nothing (null).

Usage

set_post_thumbnail_size( $width, $height, $crop );

$width(int)

Image width in pixels.
Default: 0

$height(int)

Image height in pixels.
Default: 0

$crop(true/false/array)

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

Code of set_post_thumbnail_size: wp-includes/media.php ^{VER 4.9.8}

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

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From tag: Thumbnail (images)

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