arrays - json_decode find higest number -


using script:

$res3 = $kraken->querypublic('depth', array(     'pair' => 'etceur',      'count' => '10', ));  print_r($res3);

i outcome:

array (     [error] => array         (         )      [result] => array         (             [xetczeur] => array                 (                     [asks] => array                         (                             [0] => array                                 (                                     [0] => 11.82301000                                     [1] => 3.000                                     [2] => 1502789904                                 )                              [1] => array                                 (                                     [0] => 11.84197000                                     [1] => 75.000                                     [2] => 1502790546                                 )                              [2] => array                                 (                                     [0] => 11.84198000                                     [1] => 1.363                                     [2] => 1502789011                                 )                              [3] => array                                 (                                     [0] => 11.84583000                                     [1] => 1.291                                     [2] => 1502784501                                 )                              [4] => array                                 (                                     [0] => 11.86000000                                     [1] => 0.527                                     [2] => 1502790415                                 )                              [5] => array                                 (                                     [0] => 11.86567000                                     [1] => 1.291                                     [2] => 1502784504                                 )                              [6] => array                                 (                                     [0] => 11.86648000                                     [1] => 10.000                                     [2] => 1502788231                                 )                              [7] => array                                 (                                     [0] => 11.86705000                                     [1] => 1.548                                     [2] => 1502769256                                 )                              [8] => array                                 (                                     [0] => 11.88549000                                     [1] => 3684.586                                     [2] => 1502790575                                 )                              [9] => array                                 (                                     [0] => 11.88550000                                     [1] => 561.500                                     [2] => 1502790299                                 )                          )                      [bids] => array                         (                             [0] => array                                 (                                     [0] => 11.57920000                                     [1] => 41.789                                     [2] => 1502790507                                 )                              [1] => array                                 (                                     [0] => 11.57719000                                     [1] => 215.726                                     [2] => 1502790579                                 )                              [2] => array                                 (                                     [0] => 11.57275000                                     [1] => 600.000                                     [2] => 1502790167                                 )                              [3] => array                                 (                                     [0] => 11.56821000                                     [1] => 5.366                                     [2] => 1502789829                                 )                              [4] => array                                 (                                     [0] => 11.52550000                                     [1] => 75.000                                     [2] => 1502790547                                 )                              [5] => array                                 (                                     [0] => 11.52539000                                     [1] => 600.000                                     [2] => 1502790338                                 )                              [6] => array                                 (                                     [0] => 11.52536000                                     [1] => 2.683                                     [2] => 1502788964                                 )                              [7] => array                                 (                                     [0] => 11.52222000                                     [1] => 2.683                                     [2] => 1502788873                                 )                              [8] => array                                 (                                     [0] => 11.52119000                                     [1] => 2.683                                     [2] => 1502788713                                 )                              [9] => array                                 (                                     [0] => 11.52115000                                     [1] => 2.683                                     [2] => 1502788685                                 )                          )                  )          )  )

how find highest number in [result]->[xetczeur]->[asks]->[any_number]->[1] field , transfer [0] field $purchase_price allows me to: echo $purchase_price?

i assume need somekind of json_decode i'm not strong in section, least.....


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