Simple PHP script to delete all products from Shopify store using a private App(Api key and Pass). Just replace your App info and enjoy. Thanks

shopify_delete_all_products.php

<?php
/**
 * 
 */
class ShopifyProducts{
	public function getProducts($count = false, $page){
		$apikey = 'API_KEY'; //Replace with your's
		$pass = 'PASS'; //Replace with your's
		$store = 'STORE_URL'; //Replace with your's
		if ($count == true) {
			$products_count = file_get_contents('https://'.$apikey.':'.$pass.'@'.$store.'/admin/products/count.json');
			$data = json_decode($products_count);
			return $data->count;
		}
		$products = file_get_contents('https://'.$apikey.':'.$pass.'@'.$store.'/admin/products.json?limit=250&page='.$page);
		$data = json_decode($products);
		return $data;
	}
}

$obj = new ShopifyProducts();
$count = $obj->getProducts(true, null);
$pages = ceil((int)$count/250);
echo "<br>Total no of pages: ".$pages;
for ($i=1; $i <= $pages; $i++) {
	echo "<br>Deleting products of Page No.: ". $i;
	$products = $obj->getProducts(false, $i);
	foreach ($products->products as $index => $product) {
			echo "<br>";
			print_r($product->id);
			$url = "https://API_KEY:PASS@STORE_URL/admin/products/".$product->id.".json"; //Replace with your's
    
			//Initiate cURL
			$ch = curl_init($url);
			curl_setopt($ch, CURLOPT_URL, $url);
		        curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "DELETE");
		        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
			$response  = curl_exec($ch);
			echo "<br><h1>Response</h1>";
			var_dump($response);
			curl_close($ch);
	}
}
?>