PHP经典实例(第二版)
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PHP经典实例（第2版）能够为您节省宝贵的Web开发时间。有了这些针对真实问题的解决方案放在手边，大多数编程难题都会迎刃而解。《PHP经典实例(第2版)》将PHP的特性与经典实例丛书的独特形式组合到一起，足以帮您成功地构建跨浏览器的Web应用程序。在这个修订版中，您可以更加方便地找到各种编程问题的解决方案，《PHP经典实例(第2版)》中内容涵盖了：表单处理；Session管理；数据库交互；使用We
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><li class=""><span>functioncmp($a,$b){ </span></li><li class="alt"><span>if($a[”nums”]==$b[”nums”]){ </span></li><li class=""><span>return0; </span></li><li class="alt"><span>} </span></li><li class=""><span>return($a[”nums”]</span><span class="tag"><</span><span>$b[”nums”])?-1:1; </span></li><li class="alt"><span>} </span></li><li class=""><span>$</span><span class="attribute">arr</span><span>=</span><span class="attribute-value">Array</span><span>( </span></li><li class="alt"><span></span><span class="attribute">0</span><span>=</span><span class="tag">></span><span>Array( </span></li><li class=""><span>“username”=</span><span class="tag">></span><span>owen, </span></li><li class="alt"><span>“nums”=</span><span class="tag">></span><span>2, </span></li><li class=""><span>), </span></li><li class="alt"><span></span><span class="attribute">1</span><span>=</span><span class="tag">></span><span>Array( </span></li><li class=""><span>“username”=</span><span class="tag">></span><span>d5s, </span></li><li class="alt"><span>“nums”=</span><span class="tag">></span><span>5, </span></li><li class=""><span>), </span></li><li class="alt"><span></span><span class="attribute">2</span><span>=</span><span class="tag">></span><span>Array( </span></li><li class=""><span>“username”=</span><span class="tag">></span><span>pt, </span></li><li class="alt"><span>“nums”=</span><span class="tag">></span><span>3, </span></li><li class=""><span>), </span></li><li class="alt"><span>); </span></li><li class=""><span>uasort($arr,“cmp”); </span></li><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></li><li class=""><span>print_r($arr); </span></li><li class="alt"><span>echo‘</span><span class="tag"><span class="tag-name">pre</span><span class="tag">></span><span>’; </span></span></li><li class=""><span></span><span class="tag">?></span><span> </span></li><li class="alt"><span> </span></li><li class=""><span>Array </span></li><li class="alt"><span>( </span></li><li class=""><span>[0]=</span><span class="tag">></span><span>Array </span></li><li class="alt"><span>( </span></li><li class=""><span>[username]=</span><span class="tag">></span><span>owen </span></li><li class="alt"><span>[nums]=</span><span class="tag">></span><span>2 </span></li><li class=""><span>) </span></li><li class="alt"><span> </span></li><li class=""><span>[2]=</span><span class="tag">></span><span>Array </span></li><li class="alt"><span>( </span></li><li class=""><span>[username]=</span><span class="tag">></span><span>pt </span></li><li class="alt"><span>[nums]=</span><span class="tag">></span><span>3 </span></li><li class=""><span>) </span></li><li class="alt"><span> </span></li><li class=""><span>[1]=</span><span class="tag">></span><span>Array </span></li><li class="alt"><span>( </span></li><li class=""><span>[username]=</span><span class="tag">></span><span>d5s </span></li><li class="alt"><span>[nums]=</span><span class="tag">></span><span>5 </span></li><li class=""><span>) </span></li><li class="alt"><span> </span></li><li class=""><span>) </span></li></ol>
