使用内置函数解决PHP多维数组排序问题_PHP教程

学习php时，你可能会遇到php多维数组排序问题，这里将介绍php多维数组排序问题的解决方法，在这里拿出来和大家分享一下，希望对大家有帮助。

根据数组的键进行比较大小，排序，就不用说了，php有很多，很方便的内置函数，krsort(),ksort()等如果是根据数组的值进行比较大小就麻烦一些。如果值没有重复的情况，可以先用array_flip()交换键、值；然后krsort()，然后在array_flip()交换回来，就可以比较大小。有值重复的情况，就要用到一些排序算法了，不过php有很方便的回调函数uasort()会保持原来的索引、usort()会重建索引。PHP多维数组排序代码：

<OL class=dp-xml><LI class=alt><SPAN><SPAN class=tag><?</SPAN><SPAN class=tag-name>php</SPAN><SPAN> </SPAN></SPAN><LI class=""><SPAN>functioncmp($a,$b){  </SPAN><LI class=alt><SPAN>if($a[”nums”]==$b[”nums”]){  </SPAN><LI class=""><SPAN>return0;  </SPAN><LI class=alt><SPAN>}  </SPAN><LI class=""><SPAN>return($a[”nums”]</SPAN><SPAN class=tag><</SPAN><SPAN>$b[”nums”])?-1:1;  </SPAN></SPAN><LI class=alt><SPAN>}  </SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute>arr</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>Array</SPAN><SPAN>(  </SPAN></SPAN><LI class=alt><SPAN></SPAN><SPAN class=attribute>0</SPAN><SPAN>=</SPAN><SPAN class=tag>></SPAN><SPAN>Array(  </SPAN></SPAN><LI class=""><SPAN>“username”=</SPAN><SPAN class=tag>></SPAN><SPAN>owen,  </SPAN></SPAN><LI class=alt><SPAN>“nums”=</SPAN><SPAN class=tag>></SPAN><SPAN>2,  </SPAN></SPAN><LI class=""><SPAN>),  </SPAN><LI class=alt><SPAN></SPAN><SPAN class=attribute>1</SPAN><SPAN>=</SPAN><SPAN class=tag>></SPAN><SPAN>Array(  </SPAN></SPAN><LI class=""><SPAN>“username”=</SPAN><SPAN class=tag>></SPAN><SPAN>d5s,  </SPAN></SPAN><LI class=alt><SPAN>“nums”=</SPAN><SPAN class=tag>></SPAN><SPAN>5,  </SPAN></SPAN><LI class=""><SPAN>),  </SPAN><LI class=alt><SPAN></SPAN><SPAN class=attribute>2</SPAN><SPAN>=</SPAN><SPAN class=tag>></SPAN><SPAN>Array(  </SPAN></SPAN><LI class=""><SPAN>“username”=</SPAN><SPAN class=tag>></SPAN><SPAN>pt,  </SPAN></SPAN><LI class=alt><SPAN>“nums”=</SPAN><SPAN class=tag>></SPAN><SPAN>3,  </SPAN></SPAN><LI class=""><SPAN>),  </SPAN><LI class=alt><SPAN>);  </SPAN><LI class=""><SPAN>uasort($arr,“cmp”);  </SPAN><LI class=alt><SPAN>echo‘</SPAN><SPAN class=tag><</SPAN><SPAN class=attribute>prestyle</SPAN><SPAN class=tag-name>prestyle</SPAN><SPAN>=”text-align:left”</SPAN><SPAN class=tag>></SPAN><SPAN>’;  </SPAN></SPAN><LI class=""><SPAN>print_r($arr);  </SPAN><LI class=alt><SPAN>echo‘</SPAN><SPAN class=tag></< SPAN><SPAN class=tag-name>pre</SPAN><SPAN class=tag>></SPAN><SPAN>’;  </SPAN></SPAN><LI class=""><SPAN></SPAN><SPAN class=tag>?></SPAN><SPAN> </SPAN></SPAN><LI class=alt><SPAN> </SPAN><LI class=""><SPAN>Array  </SPAN><LI class=alt><SPAN>(  </SPAN><LI class=""><SPAN>[0]=</SPAN><SPAN class=tag>></SPAN><SPAN>Array  </SPAN></SPAN><LI class=alt><SPAN>(  </SPAN><LI class=""><SPAN>[username]=</SPAN><SPAN class=tag>></SPAN><SPAN>owen  </SPAN></SPAN><LI class=alt><SPAN>[nums]=</SPAN><SPAN class=tag>></SPAN><SPAN>2  </SPAN></SPAN><LI class=""><SPAN>)  </SPAN><LI class=alt><SPAN> </SPAN><LI class=""><SPAN>[2]=</SPAN><SPAN class=tag>></SPAN><SPAN>Array  </SPAN></SPAN><LI class=alt><SPAN>(  </SPAN><LI class=""><SPAN>[username]=</SPAN><SPAN class=tag>></SPAN><SPAN>pt  </SPAN></SPAN><LI class=alt><SPAN>[nums]=</SPAN><SPAN class=tag>></SPAN><SPAN>3  </SPAN></SPAN><LI class=""><SPAN>)  </SPAN><LI class=alt><SPAN> </SPAN><LI class=""><SPAN>[1]=</SPAN><SPAN class=tag>></SPAN><SPAN>Array  </SPAN></SPAN><LI class=alt><SPAN>(  </SPAN><LI class=""><SPAN>[username]=</SPAN><SPAN class=tag>></SPAN><SPAN>d5s  </SPAN></SPAN><LI class=alt><SPAN>[nums]=</SPAN><SPAN class=tag>></SPAN><SPAN>5  </SPAN></SPAN><LI class=""><SPAN>)  </SPAN><LI class=alt><SPAN> </SPAN><LI class=""><SPAN>) </SPAN></LI></OL>

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