在这个PHP foreach循环的例子里，我们创建了$arr数组，里面的元素值是”one”,”two”,”three”，然后通过一个foreach循环来输出其数组的值。数组里面的值通过”as”存到变量value里，这样value就保存了数组arr的各个元素了。
在这里，我们所针对的是自动索引的数组，如果是关联数组呢？请看下面一种情况：
<ol class="dp-xml">
<li class="alt"><span><span>$</span><span class="attribute">sounds</span><span>=</span><span class="attribute-value">array</span><span>(”cow”=</span><span class="tag">></span><span>”moo”,”dog”<br>=</span><span class="tag">></span><span>”woof”,”pig”=</span><span class="tag">></span><span>”oink”,”duck”=</span><span class="tag">><br></span><span>”quack”); </span></span></li>
<li>
<span>foreach($sounds as $</span><span class="attribute">animal</span><span>=</span><span class="tag">></span><span>$sound) </span>
</li>
<li class="alt"><span>{ </span></li>
<li><span>Print “And of that farm he had a <br>{$animal}”; </span></li>
<li class="alt"><span>} </span></li>
</ol>注解：通过PHP foreach循环我们把数组$sounds的键赋于变量$animal，把数组的值赋值给$sound，这样我们就可以方便的访问数组每一个“键值对”(key-value)了。
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