Question

我提取所有鏈接包含在頁面上的錨或alt屬性的圖像包括在鏈接中，如果這首先來。

$html = '<a href="lien.fr">Anchor</a>'; 

必須返回 「lien.fr錨」

$html = '<a href="lien.fr"><img alt="Alt Anchor">Anchor</a>'; 

必須返回 「lien.fr; Alt鍵錨」

$html = '<a href="lien.fr">Anchor<img alt="Alt Anchor"></a>'; 

必須返回 「lien.fr錨」

我做了：

$doc = new DOMDocument(); 
$doc->loadHTML($html); 

$out = ""; 
$n = 0; 
$links = $doc->getElementsByTagName('a'); 

foreach ($links as $element) { 
    $href = $img_alt = $anchor = ""; 
    $href = $element->getAttribute('href'); 
    $n++; 
    if (!strrpos($href, "panier?")) { 

     if ($element->firstChild->nodeName == "img") { 

      $imgs = $element->getElementsByTagName('img'); 

      foreach ($imgs as $img) { 
       if ($anchor = $img->getAttribute('alt')) { 
        break; 
       } 
      } 
     } 

     if (($anchor == "") && ($element->nodeValue)) { 
      $anchor = $element->nodeValue; 
     } 

     $out[$n]['link'] = $href; 
     $out[$n]['anchor'] = $anchor; 
    } 
} 

這似乎是工作，但如果有一些空間，或縮進它不 作爲

$html = '<a href="link.fr"> 
        <img src="ceinture-gris" alt="alt anchor"/> 
       </a>'; 

在$元素 - > firstChild->節點名稱將文本

Answer 1

事情是這樣的：

$doc = new DOMDocument(); 
$doc->loadHTML($html); 

// Output texts that will later be joined with ';' 
$out = []; 
// Maximum number of items to add to $out 
$max_out_items = 2; 
// List of img tag attributes that will be parsed by the loop below 
// (in the order specified in this array!) 
$img_attributes = ['alt', 'src', 'title']; 

$links = $doc->getElementsByTagName('a'); 
foreach ($links as $element) { 
    if ($href = trim($element->getAttribute('href'))) { 
    $out []= $href; 
    if (count($out) >= $max_out_items) 
     break; 
    } 

    foreach ($element->childNodes as $child) { 
    if ($child->nodeType === XML_TEXT_NODE && 
     $text = trim($child->nodeValue)) 
    { 
     $out []= $text; 
     if (count($out) >= $max_out_items) 
     break; 
    } elseif ($child->nodeName == 'img') { 
     foreach ($img_attributes as $attr_name) { 
     if ($attr_value = trim($child->getAttribute($attr_name))) { 
      $out []= $attr_value; 
      if (count($out) >= $max_out_items) 
      goto Result; 
     } 
     } 
    } 
    } 
} 

Result: 
echo $out = implode(';', $out);