Php array usage

Array ([0] => Array ([userid] => 1 [username] => Liu Zhenpeng [status] => 0 [userpwd] =>) [1] => Array ([userid] => 2 [username] => Liu Pengfei [status] => 0 [userpwd] =>) [2] => Array ([userid] => 3 [username] => Liu Peng [status] => 0 [userpwd] =>) [3] => Array ([userid] => 4 [username] => admin [status] => 0 [userpwd] =>) [4] => Array ([userid] => 11 [username] => admin [status] => 0 [userpwd] =>) [5] => Array ([userid] => 12 [username] => admin [status] => 0 [userpwd] =>) [6] => Array ([userid] => 13 [username] => liuzp [status] => 0 [userpwd] =>) [7] => Array ([userid] => 14 [username] => lzp [status] => 0 [userpwd] => ))

The following describes how to use a two-dimensional array.
For ($ I = 0; $ I <count ($ array); $ I ++)
{
For ($ j = 0; $ j <count ($ array [$ I]); $ j ++)
  {
Echo $ array [$ j] [userid];
  }
}
Because it is a multi-dimensional array, it is generally used
Foreach ($ arr as $ key => $ value ){
Echo "Key: $ key; Value: $ value <br/> \ n ";
}