3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo serialize(array( 'merchant_id' => "668579606085558", 'merchant_key' => "l5WyGgKeJL2nk_7nsEWjJg", 'checkoutUrl' => "https://checkout.google.com/api/checkout/v2/checkout/Merchant/668579606085558" )); die;
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
a:3:{s:11:"merchant_id";s:15:"668579606085558";s:12:"merchant_key";s:22:"l5WyGgKeJL2nk_7nsEWjJg";s:11:"checkoutUrl";s:77:"https://checkout.google.com/api/checkout/v2/checkout/Merchant/668579606085558";}

preferences:
281.43 ms | 406 KiB | 456 Q