php二维数组转一维数组

<code class="hljs php has-numbering"><span class="hljs-variable">$msg</span> = <span class="hljs-keyword">array</span>(
　　<span class="hljs-keyword">array</span>(
　　　　<span class="hljs-string">'id'</span>=><span class="hljs-string">'45s'</span>,
　　　　<span class="hljs-string">'name'</span>=><span class="hljs-string">'jacks'</span>
　　),
　　<span class="hljs-keyword">array</span>(
　　　　<span class="hljs-string">'id'</span>=><span class="hljs-string">'3s4'</span>,
　　　　<span class="hljs-string">'name'</span>=><span class="hljs-string">'masry'</span>
　　),
　　<span class="hljs-keyword">array</span>(
　　　　<span class="hljs-string">'id'</span>=><span class="hljs-string">'7s8'</span>,
　　　　<span class="hljs-string">'name'</span>=><span class="hljs-string">'lili'</span>
　　),
)</code><div style="display: block;" class="save_code tracking-ad" data-mod="popu_249"><a target=_blank target="_blank"><img src="http://static.blog.csdn.net/images/save_snippets.png" alt="" /></a></div>

<code class="hljs php has-numbering"><span class="hljs-comment">//一般实现方法：</span>
<span class="hljs-comment">//1解：</span>
<span class="hljs-keyword">foreach</span>(<span class="hljs-variable">$msg</span> <span class="hljs-keyword">as</span> <span class="hljs-variable">$k</span> => <span class="hljs-variable">$v</span>){
　　　　<span class="hljs-variable">$ids</span>[] = <span class="hljs-variable">$id</span>;
　　　　<span class="hljs-variable">$names</span>[] = <span class="hljs-variable">$name</span>;
　　}
<span class="hljs-comment">//2解：</span>
<span class="hljs-variable">$ids</span> = array_column(<span class="hljs-variable">$msg</span>, <span class="hljs-string">'id'</span>);
<span class="hljs-variable">$names</span> = array_column(<span class="hljs-variable">$msg</span>, <span class="hljs-string">'name'</span>);
<span class="hljs-comment">//以上两种解法print_r($names);后的结果为：</span>
<span class="hljs-keyword">Array</span>(
　　[<span class="hljs-number">0</span>]=>jack
　　[<span class="hljs-number">1</span>]=>mary
　　[<span class="hljs-number">2</span>]=>lili
)</code>

<code class="hljs php has-numbering"><span class="hljs-comment">//快速实现方法：</span>
<span class="hljs-comment">//注意：array_column();可以有第三个参数，如 </span>
<span class="hljs-variable">$n</span> = array_column(<span class="hljs-variable">$msg</span>, <span class="hljs-string">'name'</span>, <span class="hljs-string">'id'</span>);
<span class="hljs-comment">//print_r($n);的结果为：</span>
<span class="hljs-keyword">Array</span>(
　　[<span class="hljs-number">45</span>]=>jacks
　　[<span class="hljs-number">34</span>]=>masry
　　[<span class="hljs-number">78</span>]=>lili
)</code>