A function that clones an existing reusable block a given number of times.

clone-gutenberg-reusable-block.php

<?php

/**
 * Clone a given reusable block a given number of times.
 *
 * @param int $block_id The ID of an existing reusable block to clone.
 * @param int $n_clones The number of clones to create.
 */
function clone_reusable_block( $block_id, $n_clones ) {
	$post = get_post( $block_id );
	$post->to_array();
	unset( $post->ID );
	$base_title = $post->post_title;

	// Words for search testing later — these are appended to the clone title.
	$words = [
		'donkey',
		'camel',
		'microphone',
		'water',
		'apple',
		'cat',
		'sky',
		'trees',
		'house',
		'car',
		'aeroplane',
		'microplane',
		'ski',
		'ski-doo',
		'macbook',
		'pop shield',
		'guitar',
		'venetion',
		'apricot',
		'banana',
		'lamp',
		'phone',
		'glass',
		'coffee',
	];

	for ( $i = 0; $i < $n_clones; $i ++ ) {
		$post->post_title = $base_title . ' ' . $words[ array_rand( $words ) ] . ' ' . uniqid();
		wp_insert_post( $post );
	}
}