案例分析PHP数组查询_PHP教程-php教程-PHP中文网

案例分析PHP数组查询_PHP教程

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发布： 2016-07-15 13:27:11

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学习php数组时，你可能会遇到问题，这里将介绍php数组查询，在这里拿出来和大家分享一下。php4.0中共有超过30个新的数组相关函数。其中很多通用函数允许你检查给定数组中是否存在特定对象、对数组元素计数、增加或删除元素，或对元素排序。

如果你有很大的一个数组，而所要完成的仅是找出一个存在的给定值，你可以使用in_array()以返回true 或 false。如下代码将输出“Not found in this array”——因为你将在$namesArray中寻找一个并不存在的“Alber ”。你可以对任何数组添加元素，无论是在已存在数组的开始或末尾。你也可以使用函数以创建一个包含两个或多个数组元素的新数组。合并时每个数组将按需要的顺序排列。如果你的数组已经有内部的排序，你需要对新的合并数组重排序。

PHP数组查询代码：

<OL class=dp-xml><LI class=alt><SPAN><SPAN>/**  </SPAN></SPAN><LI class=""><SPAN>*倒序数组  </SPAN><LI class=alt><SPAN>*@paramaInputarray要排序的数组  </SPAN><LI class=""><SPAN>*@param$bystring排序对象,key为按数组下标排序,value为按值排序  </SPAN><LI class=alt><SPAN>*/  </SPAN><LI class=""><SPAN>functionaryReverts($aInput,$</SPAN><SPAN class=attribute><FONT color=#ff0000>by</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>'key'</FONT></SPAN><SPAN>){  </SPAN></SPAN><LI class=alt><SPAN>if(!is_array($aInput)){  </SPAN><LI class=""><SPAN>returnfalse;  </SPAN><LI class=alt><SPAN>}  </SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>res</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>array</FONT></SPAN><SPAN>();  </SPAN></SPAN><LI class=alt><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>n</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>count</FONT></SPAN><SPAN>($aInput);  </SPAN></SPAN><LI class=""><SPAN>for($</SPAN><SPAN class=attribute><FONT color=#ff0000>i</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>0</FONT></SPAN><SPAN>;$i</SPAN><SPAN class=tag><STRONG><FONT color=#006699><</FONT></STRONG></SPAN><SPAN>$n;$i++){  </SPAN></SPAN><LI class=alt><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>tmMax</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>getMax</FONT></SPAN><SPAN>($aInput,$by);  </SPAN></SPAN><LI class=""><SPAN>print_r($tmMax);  </SPAN><LI class=alt><SPAN>list($k,$v)=each($tmMax);  </SPAN><LI class=""><SPAN>$res[$k]=$v;  </SPAN><LI class=alt><SPAN>}  </SPAN><LI class=""><SPAN>return$res;  </SPAN><LI class=alt><SPAN>}  </SPAN><LI class=""><SPAN> </SPAN><LI class=alt><SPAN> </SPAN><LI class=""><SPAN>/**  </SPAN><LI class=alt><SPAN>*@paramaInputarray要冒沟的数组  </SPAN><LI class=""><SPAN>*@param$bystring排序对象,key为按数组下标排序,value为按值排序  </SPAN><LI class=alt><SPAN>*/  </SPAN><LI class=""><SPAN>functiongetMax(&$aInput,$by){  </SPAN><LI class=alt><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>max</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>null</FONT></SPAN><SPAN>;  </SPAN></SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>maxKey</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>null</FONT></SPAN><SPAN>;  </SPAN></SPAN><LI class=alt><SPAN>if($</SPAN><SPAN class=attribute><FONT color=#ff0000>by</FONT></SPAN><SPAN>=='key')  </SPAN></SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>tar</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>'k'</FONT></SPAN><SPAN>;  </SPAN></SPAN><LI class=alt><SPAN>else  </SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>tar</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>'v'</FONT></SPAN><SPAN>;  </SPAN></SPAN><LI class=alt><SPAN>foreach($aInputas$</SPAN><SPAN class=attribute><FONT color=#ff0000>k</FONT></SPAN><SPAN>=</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN>$v){  </SPAN></SPAN><LI class=""><SPAN>if($$tar</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN>$max){  </SPAN></SPAN><LI class=alt><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>max</FONT></SPAN><SPAN>=$$tar;  </SPAN></SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>maxKey</FONT></SPAN><SPAN>=$k;  </SPAN></SPAN><LI class=alt><SPAN>}  </SPAN><LI class=""><SPAN>}  </SPAN><LI class=alt><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>maxValue</FONT></SPAN><SPAN>=$aInput[$maxKey];  </SPAN></SPAN><LI class=""><SPAN>unset($aInput[$maxKey]);  </SPAN><LI class=alt><SPAN>returnarray($</SPAN><SPAN class=attribute><FONT color=#ff0000>maxKey</FONT></SPAN><SPAN>=</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN>$maxValue);  </SPAN></SPAN><LI class=""><SPAN>}  </SPAN><LI class=alt><SPAN> </SPAN><LI class=""><SPAN> </SPAN><LI class=alt><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>list</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>array</FONT></SPAN><SPAN>('apple'=</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN>300,'orange'=</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN>150,'banana'=</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN>100,'mango'=</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN>330);  </SPAN></SPAN><LI class=""><SPAN>echo'</SPAN><STRONG><FONT color=#006699><SPAN class=tag><</SPAN><SPAN class=tag-name>xmp</SPAN><SPAN class=tag>></SPAN></FONT></STRONG><SPAN>';  </SPAN></SPAN><LI class=alt><SPAN>print_r(aryReverts($list,'value')); </SPAN></LI></OL>

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