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run code in 200+ php & hhvm versions
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<?php $a = [ 'order_id' => 60001, 'email_notification' => 'OrderConfirmation', 'email_address' => 'ad@da.com' ]; var_dump(json_encode($a));
Output for 5.4.0 - 7.2.0
string(87) "{"order_id":60001,"email_notification":"OrderConfirmation","email_address":"ad@da.com"}"
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/AEY7o on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/AEY7o on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/AEY7o on line 3
Process exited with code 255.