快速掌握PHP多维数组排序方法_PHP教程-php教程-PHP中文网

快速掌握PHP多维数组排序方法_PHP教程

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发布： 2016-07-15 13:28:40

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我们在学习php时候，我们可能为php的多维数组排序的问题感到困惑，文章这里就详细的给大家介绍一下php多维数组排序的原理。php也允许在多维数组上执行一些比较复杂的排序——例如，首先对一个嵌套数组使用一个普通的关键字进行排序，然后再根据另一个关键字进行排序。这与使用sql的order by语句对多个字段进行排序非常相似。为了能更好的明白它是如何工作的，请仔细看所举的例子：

<OL class=dp-xml><LI class=alt><SPAN><STRONG><FONT color=#006699><SPAN class=tag><?</SPAN><SPAN class=tag-name>php</SPAN></FONT></STRONG><SPAN> $</SPAN><SPAN class=attribute><FONT color=#ff0000>data</FONT></SPAN><SPAN> = </SPAN><SPAN class=attribute-value><FONT color=#0000ff>array</FONT></SPAN><SPAN>(array("id" =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> 1, "name" =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> "Boney M", "rating" =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> 3),  </SPAN></SPAN><LI class=""><SPAN>array("id" =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> 2, "name" =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> "Take That", "rating" =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> 1),  </SPAN></SPAN><LI class=alt><SPAN>array("id" =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> 3, "name" =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> "The Killers", "rating" =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> 4),  </SPAN></SPAN><LI class=""><SPAN>array("id" =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> 4, "name" =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> "Lusain", "rating" =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> 3),  </SPAN></SPAN><LI class=alt><SPAN>); foreach ($data as $</SPAN><SPAN class=attribute><FONT color=#ff0000>key</FONT></SPAN><SPAN> =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> $value) {  </SPAN></SPAN><LI class=""><SPAN>$name[$key] = $value['name'];  </SPAN><LI class=alt><SPAN>$rating[$key] = $value['rating'];  </SPAN><LI class=""><SPAN>}  </SPAN><LI class=alt><SPAN> </SPAN><LI class=""><SPAN>array_multisort($rating, $name, $data); print_r($data);</SPAN><SPAN class=tag><STRONG><FONT color=#006699>?></FONT></STRONG></SPAN><SPAN> </SPAN></SPAN></LI></OL>

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array_multisort()函数是PHP中最有用的函数之一，它有非常广泛的应用范围。另外，就如你在例子中所看到的，它能对多个不相关的数组进行排序，也可以使用其中的一个元素作为下次排序的基础，还可以对数据库结果集进行排序。这些例子应该让你对PHP多维数组排序函数的使用有了初步的了解，也向你展示了一些隐藏在PHP数组处理工具包的内部功能。这里，我们在$data数组中模拟了一个行和列数组。然后，我使用array_multisort()函数对数据集合进行重排，首先是根据rating进行排序，然后，如果rating相等的话，再根据name排序。它的输出结果如下：

<OL class=dp-xml><LI class=alt><SPAN><SPAN>Array ([0] =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> Array  </SPAN></SPAN><LI class=""><SPAN>(  </SPAN><LI class=alt><SPAN>[id] =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> 2  </SPAN></SPAN><LI class=""><SPAN>[name] =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> Take That  </SPAN></SPAN><LI class=alt><SPAN>[rating] =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> 1  </SPAN></SPAN><LI class=""><SPAN>) [1] =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> Array  </SPAN></SPAN><LI class=alt><SPAN>(  </SPAN><LI class=""><SPAN>[id] =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> 1  </SPAN></SPAN><LI class=alt><SPAN>[name] =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> Boney M  </SPAN></SPAN><LI class=""><SPAN>[rating] =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> 3  </SPAN></SPAN><LI class=alt><SPAN>)  </SPAN><LI class=""><SPAN>[2] =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> Array  </SPAN></SPAN><LI class=alt><SPAN>(  </SPAN><LI class=""><SPAN>[id] =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> 4  </SPAN></SPAN><LI class=alt><SPAN>[name] =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> Lusain  </SPAN></SPAN><LI class=""><SPAN>[rating] =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> 3  </SPAN></SPAN><LI class=alt><SPAN>)  </SPAN><LI class=""><SPAN>[3] =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> Array  </SPAN></SPAN><LI class=alt><SPAN>(  </SPAN><LI class=""><SPAN>[id] =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> 3  </SPAN></SPAN><LI class=alt><SPAN>[name] =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> The Killers  </SPAN></SPAN><LI class=""><SPAN>[rating] =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> 4  </SPAN></SPAN><LI class=alt><SPAN>)  </SPAN><LI class=""><SPAN>)  </SPAN></LI></OL>

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