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Function Reference/set post thumbnail size

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Set the default Featured Image (formerly Post Thumbnail) dimensions. To register additional image sizes for Featured Images use: add_image_size().

Note: To enable featured images, the current theme must include add_theme_support( 'post-thumbnails' ); in its functions.php file. See also Post Thumbnails.

<?php set_post_thumbnail_size( $width, $height, $crop ); ?>

$width

(int) (optional) The post thumbnail width in pixels.

Default: 0

$height

(int) (optional) The post thumbnail height in pixels.

Default: 0

$crop

(boolean) (optional) Crop the image or not. False - Soft proportional crop mode ; True - Hard crop mode.

Default: false

To be used in the current theme's functions.php file.

if ( function_exists( 'add_theme_support' ) ) {
	add_theme_support( 'post-thumbnails' );
        set_post_thumbnail_size( 150, 150 );
}

Set the default Post Thumnail size by resizing the image proportionally (that is, without distorting it):

set_post_thumbnail_size( 50, 50 ); // 50 pixels wide by 50 pixels tall, resize mode

Set the default Post Thumnail size by cropping the image (either from the sides, or from the top and bottom):

set_post_thumbnail_size( 50, 50, true ); // 50 pixels wide by 50 pixels tall, crop mode

set_post_thumbnail_size() is located in wp-includes/media.php.