生成树型结构(比如省市区)，树型结构省市区_PHP教程

<br /><?<span>php
</span><span>header</span>("Content-type: text/html; charset=utf-8"<span>);

</span><span>function</span> generateTree(<span>$items</span><span>)
{
    </span><span>$tree</span> = <span>array</span><span>();
    </span><span>foreach</span>(<span>$items</span> <span>as</span> <span>$item</span><span>){
        </span><span>if</span>(<span>isset</span>(<span>$items</span>[<span>$item</span>['pid'<span>]])){
            </span><span>$items</span>[<span>$item</span>['pid']]['son'][] = &<span>$items</span>[<span>$item</span>['id'<span>]];
        }</span><span>else</span><span>{
            </span><span>$tree</span>[] = &<span>$items</span>[<span>$item</span>['id'<span>]];
        }
    }
    </span><span>return</span> <span>$tree</span><span>;
}<br />//需要注意的一点，数组的key值必须与id值保持一致
</span><span>$items</span> = <span>array</span><span>(
    </span>1 => <span>array</span>('id' => 1, 'pid' => 0, 'name' => '安徽省'),
    2 => <span>array</span>('id' => 2, 'pid' => 0, 'name' => '浙江省'),
    3 => <span>array</span>('id' => 3, 'pid' => 1, 'name' => '合肥市'),
    4 => <span>array</span>('id' => 4, 'pid' => 3, 'name' => '长丰县'),
    5 => <span>array</span>('id' => 5, 'pid' => 1, 'name' => '安庆市'),<span>
);
</span><span>echo</span> "<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">"<span>;
</span><span>print_r</span>(generateTree(<span>$items</span>));