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run code in 150+ php & hhvm versions
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<?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 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
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";}