php - DOMNodeList::getAttribute 未定义

Question

我尝试运行此代码，但 php 抛出: fatal error :调用路径/to/feature-manager.php 中未定义的方法 DOMNodeList::getAttribute()

这个文件包含html

//features.php

<div class="col-md-4">
  <div class="feature">
 <img class="img-fluid" src="media/artwork_icon_512.png" id="feature-icon1">
  <h4>Feature 1</h4>
    </div>
</div><!---->
    
    
<div class="col-md-4">
  <div class="feature">
 <img class="img-fluid" src="media/dress_flat_icon-512.png" id="feature-icon2">
  <h4>Feature 2</h4>
    </div>
</div><!---->
    
   
<div class="col-md-4">
  <div class="feature">
  <img class="img-fluid" src="media/users-512.png" id="feature-icon3">
  <h4>Feature 3</h4>
    </div>
</div>

然后我调用它到这个文件

//feature-manager.php

$read=file_get_contents('../include/features.php');
$features = explode('<!---->', $read);

$doc= new DOMDocument();
foreach ($features as $feature) {
	
$doc->loadHTML($feature);
$img = $doc->getElementsByTagName("img"); 
	$imgsrc = $img->getAttribute('src');
	
echo $imgsrc;

显然我想从中获取 src attrib 但不知何故无法识别 getAttribute()

Answer 1

你必须遍历 getElementsByTagName() 的结果

该函数返回一个DomNodeList，getAttribute属于DOMElement

//feature-manager.php

$read=file_get_contents('../include/features.php');
$features = explode('<!---->', $read);

$doc= new DOMDocument();
foreach ($features as $feature) {
	
    $doc->loadHTML($feature);
    $images = $doc->getElementsByTagName("img"); 
    foreach($images as $img){

	    $imgsrc = $img->getAttribute('src');
	    echo $imgsrc;
    }
}