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php 奇怪现象，求大神解答

php中文网

发布： 2016-07-29 09:14:18

原创

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<span ><?php
</span><span >$aBU </span><span >= </span><span >array </span><span >(
</span><span ></span><span >array </span><span >( </span><span >'id' </span><span >=> </span><span >'0'</span><span >, </span><span >)</span><span >,
</span><span ></span><span >array </span><span >( </span><span >'id' </span><span >=> </span><span >'1'</span><span >, </span><span >)</span><span >,
</span><span ></span><span >array </span><span >( </span><span >'id' </span><span >=> </span><span >'2'</span><span >, </span><span >)</span><span >,
</span><span ></span><span >array </span><span >( </span><span >'id' </span><span >=> </span><span >'3'</span><span >, </span><span >)</span><span >,
</span><span >)</span><span >;
</span><span >echo </span><span >"<h3></span><span "font-family:'宋体'; color:#6a8759; background-color:#232525">原来数据</span><span ></h3>"</span><span >;
</span><span >print_r(</span><span >$aBU</span><span >)</span><span >;
</span><span >echo </span><span >"<hr />"</span><span >;
</span><span ></span><span >foreach</span><span >(</span><span >$aBU </span><span >as  </span><span >&</span><span >$bu</span><span >){
</span><span ></span><span >$bu</span><span >[</span><span >'dept'</span><span >] = rand(</span><span >100</span><span >, </span><span >999</span><span >)</span><span >;
</span><span >}
</span><span >//unset($bu);
</span><span >echo </span><span >"<h3></span><span "font-family:'宋体'; color:#6a8759; background-color:#232525">加入</span><span >dept</span><span "font-family:'宋体'; color:#6a8759; background-color:#232525">后</span><span ></h3>"</span><span >;
</span><span >print_r(</span><span >$aBU</span><span >)</span><span >;
</span><span >echo </span><span >"<hr />"</span><span >;
</span><span ></span><span ></span><span >echo </span><span >"<h3></span><span "font-family:'宋体'; color:#6a8759; background-color:#232525">重新遍历</span><span ></h3>"</span><span >;
</span><span >foreach</span><span >(</span><span >$aBU </span><span >as </span><span >$key </span><span >=> </span><span >$bu</span><span >){
</span><span >    print_r(</span><span >$bu</span><span >)</span><span >;
</span><span ></span><span >echo </span><span >"<br />"</span><span >;
</span><span >}</span>

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输出：

原来数据

Array( [0] => Array ( [id] => 0 ) [1] => Array ( [id] => 1 ) [2] => Array ( [id] => 2 ) [3] => Array ( [id] => 3 ))

加入dept后

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 ))

重新遍历，最后一个元素的竟然得到的竟然是前一个元素？

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

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