php数组转xml的递归实现，php数组xml递归_PHP教程

php数组转xml的递归实现，php数组xml递归

PHP中奖数组转为xml的需求是常见的，而且实现方法也有很多种，百度找了一下各种实现方法，但是基本是借组一些组件啥的。我就自己写了一个字符串拼组的方法，支持多维数组。仅供参考，不足之处敬请不吝赐教！

<span>/*</span><span>*
*   将数组转换为xml
*    @param array $data    要转换的数组
*   @param bool $root     是否要根节点
*   @return string         xml字符串
*    @author Dragondean
*    @url    http://www.cnblogs.com/dragondean
</span><span>*/</span>
<span>function</span> arr2xml(<span>$data</span>, <span>$root</span> = <span>true</span><span>){
    </span><span>$str</span>=""<span>;
    </span><span>if</span>(<span>$root</span>)<span>$str</span> .= "<xml>"<span>;
    </span><span>foreach</span>(<span>$data</span> <span>as</span> <span>$key</span> => <span>$val</span><span>){
        </span><span>if</span>(<span>is_array</span>(<span>$val</span><span>)){
            </span><span>$child</span> = arr2xml(<span>$val</span>, <span>false</span><span>);
            </span><span>$str</span> .= "<<span>$key</span>><span>$child</span></<span>$key</span>>"<span>;
        }</span><span>else</span><span>{
            </span><span>$str</span>.= "<<span>$key</span>><![CDATA[<span>$val</span>]]></<span>$key</span>>"<span>;
        }
    }
    </span><span>if</span>(<span>$root</span>)<span>$str</span> .= "</xml>"<span>;
    </span><span>return</span> <span>$str</span><span>;
}</span>

上面是实现的方法，第一个参数是你要转换的数组，第二个可选参数设定是否需要加根节点，默认是需要的。

测试代码：

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<span>$arr</span>=<span>array</span>('a'=>'aaa','b'=><span>array</span>('c'=>'1234' , 'd' => "asdfasdf"<span>));
</span><span>echo</span> arr2xml(<span>$arr</span>);

代码执行后的结果为：

<span><</span><span>xml</span><span>><</span><span>a</span><span>></span><span><!</span><span>[CDATA[aaa]]</span><span>></span><span></</span><span>a</span><span>><</span><span>b</span><span>><</span><span>c</span><span>></span><span><!</span><span>[CDATA[1234]]</span><span>></span><span></</span><span>c</span><span>><</span><span>d</span><span>></span><span><!</span><span>[CDATA[asdfasdf]]</span><span>></span><span></</span><span>d</span><span>></</span><span>b</span><span>></</span><span>xml</span><span>></span>

---------------------- ----------

更新：

在使用过程中发现下面格式的数组转换会出现问题：

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<span>array</span><span>(
    </span>'item' => <span>array</span><span>(
        </span><span>array</span><span>(
            </span>'title' => 'qwe',
            'description' => 'rtrt',
            'picurl' => 'sdfsd',
            'url' => 'ghjghj'<span>
        )</span>,
        <span>array</span><span>(
            </span>'title' => 'jyutyu',
            'description' => 'werwe',
            'picurl' => 'xcvxv',
            'url' => 'ghjgh'<span>
        )
    )
);</span>

转换出来的结果是：

<span><</span><span>xml</span><span>></span>
    <span><</span><span>item</span><span>></span>
        <span><</span><span>0</span><span>></span>
            <span><</span><span>title</span><span>></span>
                <span><![CDATA[</span><span>qwe</span><span>]]></span>
            <span></</span><span>title</span><span>></span>
            <span><</span><span>description</span><span>></span>
                <span><![CDATA[</span><span>rtrt</span><span>]]></span>
            <span></</span><span>description</span><span>></span>
            <span><</span><span>picurl</span><span>></span>
                <span><![CDATA[</span><span>sdfsd</span><span>]]></span>
            <span></</span><span>picurl</span><span>></span>
            <span><</span><span>url</span><span>></span>
                <span><![CDATA[</span><span>ghjghj</span><span>]]></span>
            <span></</span><span>url</span><span>></span>
        <span></</span><span>0</span><span>></span>
        <span><</span><span>1</span><span>></span>
            <span><</span><span>title</span><span>></span>
                <span><![CDATA[</span><span>jyutyu</span><span>]]></span>
            <span></</span><span>title</span><span>></span>
            <span><</span><span>description</span><span>></span>
                <span><![CDATA[</span><span>werwe</span><span>]]></span>
            <span></</span><span>description</span><span>></span>
            <span><</span><span>picurl</span><span>></span>
                <span><![CDATA[</span><span>xcvxv</span><span>]]></span>
            <span></</span><span>picurl</span><span>></span>
            <span><</span><span>url</span><span>></span>
                <span><![CDATA[</span><span>ghjgh</span><span>]]></span>
            <span></</span><span>url</span><span>></span>
        <span></</span><span>1</span><span>></span>
    <span></</span><span>item</span><span>></span>
<span></</span><span>xml</span><span>></span>

通常情况下，上面转换出来的xml整那层节点我们是不要的。但是在php中下标有不能同名，不能有多个item。怎么办呢？

我想了一个办法就是给item下下标，比如item[0],item[1]，在转换过程中在去掉[]形式的下标，实现多个item节点并排。

函数修改后如下:

<span>function</span> arr2xml(<span>$data</span>, <span>$root</span> = <span>true</span><span>){
    </span><span>$str</span>=""<span>;
    </span><span>if</span>(<span>$root</span>)<span>$str</span> .= "<xml>"<span>;
    </span><span>foreach</span>(<span>$data</span> <span>as</span> <span>$key</span> => <span>$val</span><span>){
        </span><span>//</span><span>去掉key中的下标[]</span>
        <span>$key</span> = <span>preg_replace</span>('/\[\d*\]/', '', <span>$key</span><span>);
        </span><span>if</span>(<span>is_array</span>(<span>$val</span><span>)){
            </span><span>$child</span> = arr2xml(<span>$val</span>, <span>false</span><span>);
            </span><span>$str</span> .= "<<span>$key</span>><span>$child</span></<span>$key</span>>"<span>;
        }</span><span>else</span><span>{
            </span><span>$str</span>.= "<<span>$key</span>><![CDATA[<span>$val</span>]]></<span>$key</span>>"<span>;
        }
    }
    </span><span>if</span>(<span>$root</span>)<span>$str</span> .= "</xml>"<span>;
    </span><span>return</span> <span>$str</span><span>;
}</span>

那么上面需要转换的数组也需要跟着变动一下：

<span>$arr1</span> =<span>array</span><span>(
    </span>'item[0]' => <span>array</span><span>(
            </span>'title' => 'qwe',
            'description' => 'rtrt',
            'picurl' => 'sdfsd',
            'url' => 'ghjghj'<span>
        )</span>,
    'item[1]' => <span>array</span><span>(
            </span>'title' => 'jyutyu',
            'description' => 'werwe',
            'picurl' => 'xcvxv',
            'url' => 'ghjgh'<span>
        )
);</span>

转换后的xml如下：

<span><</span><span>xml</span><span>></span>
    <span><</span><span>item</span><span>></span>
        <span><</span><span>title</span><span>></span>
            <span><![CDATA[</span><span>qwe</span><span>]]></span>
        <span></</span><span>title</span><span>></span>
        <span><</span><span>description</span><span>></span>
            <span><![CDATA[</span><span>rtrt</span><span>]]></span>
        <span></</span><span>description</span><span>></span>
        <span><</span><span>picurl</span><span>></span>
            <span><![CDATA[</span><span>sdfsd</span><span>]]></span>
        <span></</span><span>picurl</span><span>></span>
        <span><</span><span>url</span><span>></span>
            <span><![CDATA[</span><span>ghjghj</span><span>]]></span>
        <span></</span><span>url</span><span>></span>
    <span></</span><span>item</span><span>></span>
    <span><</span><span>item</span><span>></span>
        <span><</span><span>title</span><span>></span>
            <span><![CDATA[</span><span>jyutyu</span><span>]]></span>
        <span></</span><span>title</span><span>></span>
        <span><</span><span>description</span><span>></span>
            <span><![CDATA[</span><span>werwe</span><span>]]></span>
        <span></</span><span>description</span><span>></span>
        <span><</span><span>picurl</span><span>></span>
            <span><![CDATA[</span><span>xcvxv</span><span>]]></span>
        <span></</span><span>picurl</span><span>></span>
        <span><</span><span>url</span><span>></span>
            <span><![CDATA[</span><span>ghjgh</span><span>]]></span>
        <span></</span><span>url</span><span>></span>
    <span></</span><span>item</span><span>></span>
<span></</span><span>xml</span><span>></span>