嵌套的foreach循环

Question

I know this solution is simple, but it keeps slipping my mind. When I parse the page with this code and the $links array is printed, all of href parts are correct yet the img part only prints the last src element that is found on the page.

$doc = new DOMDocument();
$doc->loadHTML($html);
$links = array();
$images = $doc->getElementsByTagName("img");
$arr = $doc->getElementsByTagName("a");

    foreach($arr as $item) {
        // get links
        $href =  $item->getAttribute("href");

        // get images.
        foreach ($images as $item) {
            $img = $item->getAttribute('src');
        }    

        $links[] = array(
            'href' => $href,
            'img' => $img
        );
    }

print_r(array_values($links));

Answer 1

用于图像的每个语句的for应该建立一个数组，其中最后一个数组（$ links）是一个多维数组（$ img是嵌套数组）。

Answer 2

You use the dublicate variable $item in internal foreach.

Try this without internal foreach

$doc = new DOMDocument();
$doc->loadHTML($html);
$links = array();
$images = $doc->getElementsByTagName("img");
$arr = $doc->getElementsByTagName("a");

    foreach($arr as $key=>$item) {
        // get links
        $href =  $item->getAttribute("href");

        $img = $images[$key]->getAttribute('src');

        $links[] = array(
            'href' => $href,
            'img' => $img
        );
    }unset($item);

print_r(array_values($links));

Answer 3

Check if this works for you:

$doc = new DOMDocument();
$doc->loadHTML($html);
$links = array();
$images = $doc->getElementsByTagName("img");
$arr = $doc->getElementsByTagName("a");

foreach($arr as $item) {
    // get links
    $href =  $item->getAttribute("href");

    // get images.
    foreach ($images as $item) {
        $img = $item->getAttribute('src');

        // storing the image src 
        $links[] = array(
           'img' => $img
        );
    }    

    $links[] = array(
        'href' => $href
    );
}

print_r(array_values($links));