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Homephp教程php手册PHP搜索数组的实现方法介绍

PHP搜索数组的实现方法介绍

Jun 13, 2016 am 11:10 AM
arrayphpintroduceelementexistheadaccomplishsearcharraymethodAdd toof

array_unshift() //在数组的头部添加元素,也就是把一个新的元素插入到数组,相应索引还自动改变
array_push() //在数组尾部添加元素
array_shift() //在数组头部删除元素
array_pop() //在数组尾部删除元素

这几个函数的用法基本差不多,在PHP的帮助手册中可以得到具体的用法,在此就不多啰嗦了。

PHP搜索数组的代码示例:

in_array()函数在数组中搜索一个特定的值,如果找到则返回TRUE,否则返回FALSE。以下的示例来自PHP帮助手册。

<ol class="dp-xml">
<li class="alt"><span><span class="tag"><span> ?php  </span></span></span></li>
<li>
<span>$</span><span class="attribute">os</span><span> = </span><span class="attribute-value">array</span><span>("Mac", "NT", "Irix", "Linux");  </span>
</li>
<li class="alt"><span>if (in_array("Irix", $os)) {  </span></li>
<li><span>echo "Got Irix";  </span></li>
<li class="alt"><span>}  </span></li>
<li><span>if (in_array("mac", $os)) {  </span></li>
<li class="alt"><span>echo "Got mac";  </span></li>
<li><span>}  </span></li>
<li class="alt">
<span class="tag">?></span><span> </span>
</li>
</ol>

要特别说明的,in_array()在搜索时是区分大小的,所以以上的例子只会返回“Got Irix”。你也可以用数组作为子串在数组中进行搜索,更多的实例请查看帮助手册。

PHP搜索数组之搜索关联数组

如果你搜索的数组是一个关联数组,就要使用array_key_exists(),其返回值跟in_array()一样。同样我们引用PHP帮助手册的例子来说明:

<ol class="dp-xml">
<li class="alt"><span><span class="tag"><span> ?php  </span></span></span></li>
<li>
<span>$</span><span class="attribute">search_array</span><span> = array('first' =</span><span class="tag">></span><span> 1, 'second' =</span><span class="tag">></span><span> 4);  </span>
</li>
<li class="alt"><span>if (array_key_exists('first', $search_array)) {  </span></li>
<li><span>echo "The 'first' element is in the array";  </span></li>
<li class="alt"><span>}  </span></li>
<li>
<span class="tag">?></span><span> </span>
</li>
</ol>

相信这么一段代码就不要解释了吧,一看就能够明白,其结果:The ‘first’ element is in the array。这说明”first”存在于数组”search_array”中。


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