php的array

这段时间做数据统计，产品那边要求数据能按高到低排序，想了很多方法，都不行。最后找到PHP的array_multisort()方法。虽然实现了效果，但对这个方法还是半董半董 下边就是使用的实例，手册上的例子不列了，就我自己工作中的几个。 工作中碰到最多的可能就是

这段时间做数据统计，产品那边要求数据能按高到低排序，想了很多方法，都不行。最后找到PHP的array_multisort()方法。虽然实现了效果，但对这个方法还是半董半董

下边就是使用的实例，手册上的例子不列了，就我自己工作中的几个。

工作中碰到最多的可能就是二维数组了，想试试三维数组，但是想想还是算了。

如果有误，请以PHP官网的官方手册为准。http://php.net/manual/zh/function.array-multisort.php 

<span> 1</span> <span>header</span>('Content-Type: text/html; charset=utf-8'<span>);
</span><span> 2</span> <span>echo</span> '<pre class="brush:php;toolbar:false">'<span>;
</span><span> 3</span> <span>//</span><span>原始数组格式</span>
<span> 4</span> <span>$array</span> = <span>array</span><span>(
</span><span> 5</span>     'key1' => <span>array</span><span>(
</span><span> 6</span>         'item1' => '65',
<span> 7</span>         'item2' => '35',
<span> 8</span>         'item3' => '84',
<span> 9</span>     ),
<span>10</span>     'key2' => <span>array</span><span>(
</span><span>11</span>         'item1' => '24',
<span>12</span>     ),
<span>13</span>     'key3' => <span>array</span><span>(
</span><span>14</span>         'item1' => '38',
<span>15</span>         'item3' => '45',
<span>16</span>     ),
<span>17</span> <span>);
</span><span>18</span> <span>//</span><span>要排序的键
</span><span>19</span> <span>//按照数组中的 item1进行排序
</span><span>20</span> <span>//你也可以换成item2</span>
<span>21</span> <span>$sort</span> = 'item1'<span>;
</span><span>22</span> <span>foreach</span>(<span>$array</span> <span>as</span> <span>$k</span> => <span>$v</span><span>)
</span><span>23</span> <span>{
</span><span>24</span>     <span>$newArr</span>[<span>$k</span>] = <span>$v</span>[<span>$sort</span><span>];
</span><span>25</span> <span>}
</span><span>26</span> <span>//</span><span>这个函数如果执行正确他会直接改变原数组键值的顺序
</span><span>27</span> <span>//如果执行失败，那么他会返回 bool(false)</span>
<span>28</span> <span>array_multisort</span>(<span>$newArr</span>,SORT_DESC, <span>$array</span><span>);
</span><span>29</span> <span>var_dump</span>(<span>$array</span><span>);
</span><span>30</span> <span>//</span><span>---------------------排序后的数组打印效果 开始--------------------</span>
<span>31</span> <span>array</span>(3<span>) {
</span><span>32</span>   ["key1"]=>
<span>33</span>   <span>array</span>(3<span>) {
</span><span>34</span>     ["item1"]=>
<span>35</span>     <span>string</span>(2) "65"
<span>36</span>     ["item2"]=>
<span>37</span>     <span>string</span>(2) "35"
<span>38</span>     ["item3"]=>
<span>39</span>     <span>string</span>(2) "84"
<span>40</span> <span>  }
</span><span>41</span>   ["key3"]=>
<span>42</span>   <span>array</span>(2<span>) {
</span><span>43</span>     ["item1"]=>
<span>44</span>     <span>string</span>(2) "38"
<span>45</span>     ["item3"]=>
<span>46</span>     <span>string</span>(2) "45"
<span>47</span> <span>  }
</span><span>48</span>   ["key2"]=>
<span>49</span>   <span>array</span>(1<span>) {
</span><span>50</span>     ["item1"]=>
<span>51</span>     <span>string</span>(2) "24"
<span>52</span> <span>  }
</span><span>53</span> <span>}
</span><span>54</span> <span>//</span><span>---------------------排序后的数组打印效果 结束---------------------</span>