WordPress at a glance
function is not described

WP_Image_Editor_GD::_resize() protected WP 1.0

{} It's a method of the class: WP_Image_Editor_GD{}

No Hooks.

Return

resource/WP_Error.

Usage

// protected - for code of main (parent) or child class
$result = $this->_resize( $max_w, $max_h, $crop );
$max_w(int) (required)
$max_h(int) (required)
$crop(true/false/array)

Default: false

Code of WP_Image_Editor_GD::_resize() WP 5.5.1

<?php
protected function _resize( $max_w, $max_h, $crop = false ) {
	$dims = image_resize_dimensions( $this->size['width'], $this->size['height'], $max_w, $max_h, $crop );

	if ( ! $dims ) {
		return new WP_Error( 'error_getting_dimensions', __( 'Could not calculate resized image dimensions' ), $this->file );
	}

	list( $dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h ) = $dims;

	$resized = wp_imagecreatetruecolor( $dst_w, $dst_h );
	imagecopyresampled( $resized, $this->image, $dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h );

	if ( is_resource( $resized ) ) {
		$this->update_size( $dst_w, $dst_h );
		return $resized;
	}

	return new WP_Error( 'image_resize_error', __( 'Image resize failed.' ), $this->file );
}