How does PHP get the value of a field specified by a two-dimensional array?

Requirements: There are the following array $arr, the array has two modules a net one login, how can I get the last marks according to the net module,
The net module and the login module data is a $arr, net module may also be find add up del Chark or more fields,
No matter how much he's plugged in, I'll come up and I can find the last marks, if you find the last marks under Del, if I don't know del is the one after the group, if I know, I'll make an index, and a foreach, do not traverse, traverse speed is unpleasant, Who's going to give it a little speed?

$arr = Array ("net" = = Array ("find" = = Array (                                       "marks" = "1234", "name" = "Lisi"),                                       "add" = = Array (" Marks "+", "name" and "Lisi2",                                       "up" + = Array ("Marks" and "+", "name" = "Lisi3"),                                       "Del" and "=" Array ("Marks" = "9", "name" = "Lisi4")                               ,                           "Login" = = Array ("                                      find" = = Array ("Marks" and "=" 16661 "," name "=" Lisi5 "),                                      " add "= = Array (" Marks "and" 18881 "," Name "and" Lisi6 "))                          ;

Reply to discussion (solution)

$v = End ($arr [' net ']), $k = key ($arr [' net ']), echo $k;p rint_r ($v);

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