Print PHP Arrays Value

[Cordania]

please tell me how to print KEYS 1T and 3T from this air:AirSegmentRef array\[code\]Array( [attr] => Array ( [Key] => 0T [TotalPrice] => AUD281.90 [BasePrice] => EUR98.00 [ApproximateTotalPrice] => AUD281.90 [ApproximateBasePrice] => AUD131.00 [EquivalentBasePrice] => AUD131.00 [Taxes] => AUD150.90 ) [air:AirSegmentRef] => Array ( [0] => Array ( [attr] => Array ( [Key] => 1T ) ) [1] => Array ( [attr] => Array ( [Key] => 3T ) ) )\[/code\]i've tried 2 ways, but they are not working for me \[code\] echo $AirPricingSolution[0]['attr']['air:AirSegmentRef'][0]['Key']; echo $AirPricingSolution[0]['attr']['air:AirSegmentRef'][1]['attr']['Key'];\[/code\]sorry for my english, i'm from Romania