生成树型结构(比如省市区)，树型结构省市区
<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>$items</span> = <span>array</span><span>(
</span>1 => <span>array</span>('id' => 1, 'pid' => 0, 'name' => '安徽省'),
2 => <span>array</span>('id' => 2, 'pid' => 0, 'name' => '浙江省'),
3 => <span>array</span>('id' => 3, 'pid' => 1, 'name' => '合肥市'),
4 => <span>array</span>('id' => 4, 'pid' => 3, 'name' => '长丰县'),
5 => <span>array</span>('id' => 5, 'pid' => 1, 'name' => '安庆市'),<span>
);
</span><span>echo</span> "<pre class="brush:php;toolbar:false;">"<span>;
</span><span>print_r</span>(generateTree(<span>$items</span>));
上面方法的优化：
php header("Content-type: text/html; charset=utf-8"); function generateTree($items) { foreach($items as $item) $items[$item['pid']]['son'][$item['id']] = &$items[$item['id']]; return isset($items[0]['son']) ? $items[0]['son'] : array(); } //需要注意的一点，数组的key值必须与id保持一致 $items = array( 1 => array('id' => 1, 'pid' => 0, 'name' => '安徽省'), 2 => array('id' => 2, 'pid' => 0, 'name' => '浙江省'), 3 => array('id' => 3, 'pid' => 1, 'name' => '合肥市'), 4 => array('id' => 4, 'pid' => 3, 'name' => '长丰县'), 5 => array('id' => 5, 'pid' => 1, 'name' => '安庆市'), ); echo "
"<span>; </span><span>print_r</span>(generateTree(<span>$items</span>)); <span class="cnblogs_code_collapse">View Code</span> <p> </p><p>结果：</p><p></p>
