PayPal\Api\Invoice::search PHP Method

    public static function search($search, $apiContext = null, $restCall = null)
    {
        ArgumentValidator::validate($search, 'search');
        $payLoad = $search->toJSON();
        $json = self::executeCall("/v1/invoicing/search", "POST", $payLoad, null, $apiContext, $restCall);
        $ret = new InvoiceSearchResponse();
        $ret->fromJson($json);
        return $ret;
    }

<?php

// # Search Invoices Sample
// This sample code demonstrate how you can
// search invoices from history.
/** @var Invoice $invoice */
$invoice = (require 'CreateInvoice.php');
use PayPal\Api\Invoice;
use PayPal\Api\Search;
try {
    // ### Search Object
    // Fill up your search criteria for Invoice search.
    // Using the new way to inject raw json string to constructor
    $search = new Search('{
          "start_invoice_date" : "2010-05-10 PST",
          "end_invoice_date" : "2019-05-11 PST",
          "page" : 1,
          "page_size" : 20,
          "total_count_required" : true
        }');
    // ### Search Invoices
    // Retrieve the Invoice History object by calling the
    // static `search` method on the Invoice class.
    // Refer the method doc for valid values for keys
    // (See bootstrap.php for more on `ApiContext`)
    $invoices = Invoice::search($search, $apiContext);
} catch (Exception $ex) {
    ResultPrinter::printError("Search Invoice", "Invoice", null, null, $ex);
    exit(1);
}
ResultPrinter::printResult("Search Invoice", "Invoice", null, $search, $invoices);