Php 从数组中删除空/空元素/索引/键

Php 从数组中删除空/空元素/索引/键,php,arrays,dom,Php,Arrays,Dom,我将从HTMl内容中分离所有url链接 使用此代码 $doc = new DOMDocument(); $doc->loadHTML($string); $anchorTags = $doc->getElementsByTagName('a'); $links = array(); foreach ($anchorTags as $url) { $source = parse_url($url->getAttribute('href')); $source =

我将从HTMl内容中分离所有url链接 使用此代码

$doc = new DOMDocument();
$doc->loadHTML($string);
$anchorTags = $doc->getElementsByTagName('a');
$links = array();
foreach ($anchorTags as $url) {
    $source = parse_url($url->getAttribute('href'));
    $source = preg_replace('/^www\./', '', $source['host']);
    $links[$source][$url->getAttribute('href')] = $url->nodeValue;
}
使用上述代码输出。

Array
(
    [Facebook] => Array
                (
                    [facebook.com] => https://www.facebook.com/
                )

    [Google] => Array
                (
                    [google.com] => https://www.google.com/
                )

    [] => Array
        (
            [] =>
         )

    [yahoo] => Array
            (
                [yahoo.com] => https://www.yahoo.com/
            )

)
我只想从数组中删除空/空元素/索引/键 为此,我正在使用

但没有得到解决方案

print_r(array_filter($links));

或者,更优雅一点,如果数组为空,甚至不要将结果推送到数组中:

if ($source != "") $links[$source][$url->getAttribute('href')] = $url->nodeValue;

或者,更优雅一点,如果数组为空,甚至不要将结果推送到数组中:

if ($source != "") $links[$source][$url->getAttribute('href')] = $url->nodeValue;

你可以像这样检查斯特伦


print_r(数组过滤器($links,'strlen')

你可以像这样查看strlen


print_r(数组过滤器($links,'strlen')

只需添加检查值的条件:

$links = array();
foreach ($anchorTags as $url) {
    $source = parse_url($url->getAttribute('href'));
    $source = preg_replace('/^www\./', '', $source['host']);
    if($source != null && $source != "" && $url->nodeValue != null && $url->nodeValue != ""){
         $links[$source][$url->getAttribute('href')] = $url->nodeValue;
    }
}

只需添加检查值的条件:

$links = array();
foreach ($anchorTags as $url) {
    $source = parse_url($url->getAttribute('href'));
    $source = preg_replace('/^www\./', '', $source['host']);
    if($source != null && $source != "" && $url->nodeValue != null && $url->nodeValue != ""){
         $links[$source][$url->getAttribute('href')] = $url->nodeValue;
    }
}
你可以试试这个

    // Remove empty elements
foreach($links as $key => $val){
    if($val == '')
    {
        unset($val);
    }
}
你可以试试这个

    // Remove empty elements
foreach($links as $key => $val){
    if($val == '')
    {
        unset($val);
    }
}