dqiz20794 2010-11-22 01:46
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使用变量访问PHP obj

Updating this question...I'm working on a small CMS. The data is held in XML. I'm trying to access the right image field to update the filename and delete the current image.

Script gets variables based on where it was called from. In this case $page = "homes", $elem = "home" and $field = 0. Below is called on an image upload.

if (!empty($_FILES)) {
    $field = $_POST['field'];
    $tempFile = $_FILES['upload']['tmp_name'];
    $targetFile = "img/sections/".$_POST['page']."/";
    $targetFile .= basename($_FILES['upload']['name']);
    if (move_uploaded_file($tempFile,$targetFile)) {
        $file = "spice.xml";
        $load = simplexml_load_file($file);
        $old_img = $load->sections->$page->$elem[$field]['img'];
        $load->sections->$page->$elem[$field]['img'] = $targetFile;
        file_put_contents($file, $xml->saveXML());
        unlink($old_img);
    }
}

This is the structure of the XML file:

<spice>
    <sections>
        <homes>
            <home img="img/sections/home/img1.jpg"/>
            <home img="img/sections/home/img2.jpg"/>
            <home img="img/sections/home/img3.jpg"/>
        </homes>    
    </sections>
</spice>

My problem is that $old_img is giving me a "Cannot use string offset as an array" error. If I replace just the $elem and $field variables with values it all works fine.

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  • doumei2023 2010-11-22 02:37
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    Alternative code using XPath:

    $load = simplexml_load_file($file);
    $path=$load->xpath('//sections/'.$page.'/'.$elem);
    $path[$field]['img']=$targetFile;
    
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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