PHP strange phenomenon, ask the big God solution

  $aBU= Array(Array( ' id '=' 0 ', ),Array( ' id '=' 1 ', ),Array( ' id '=' 2 ', ),Array( ' id '=' 3 ', ),);Echo"
Original data
";Print_r ($aBU);Echo"
    ";foreach($aBU as&$bu){$bu[' Dept '] = rand ( -, 999);}//unset ($BU);Echo"
Join Dept after
";Print_r ($aBU);Echo"
    ";Echo"
Re-traverse
";foreach($aBU as$key=$bu){Print_r ($bu);Echo"
";}

Output:

Original data

Array ([0] = = Array ([id] = 0) [1] = = Array ([ID] + 1) [2] = = Array ([ID] + 2) [3] = = Array ([id] = 3))

After joining Dept

Array ([0] = = Array ([id] = 0 [Dept] = 783) [1] = = Array ([id] = 1 [Dept] = 683) [2] = = Array ([id] = 2 [Dept] = 442) [3] = = Array ([id] = 3 [Dept] + 121))

Re-traverse, the last element unexpectedly get is actually a previous element?

Array ([id] = 0 [Dept] = 783)
Array ([id] = 1 [Dept] = 683)
Array ([id] = 2 [Dept] = 442)
Array ([id] = 2 [Dept] = 442)

The above introduces the strange phenomenon of PHP, ask God to answer, including aspects of the content, I hope that the PHP tutorial interested in a friend helpful.

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