16行目のC：\ xampp \ htdocs \ college-project \ index.phpで非オブジェクトのプロパティを取得しようとしています

Question

C：\ xampp \ htdocs \ college-project \ indexの非オブジェクトのプロパティを取得しようとしていますライン上の.php 16

<?php 
    $start="http://localhost/college-project/test.html"; 

    $already_crawled=array(); 

    function get_details($url) 
    { 
     $options = array('http'=>array('method'=>'GET', 'headers'=>"User-Agent:howBot/0.1\n")); 

     $context=stream_context_create($options); 

     $doc = new DOMDocument(); 
     @$doc->loadHTML(@file_get_contents($url, false, $context)); 

     $title=$doc->getElementsByTagName("title"); 
     $title=$title->item(0)->nodeValue; 

     echo $title."\n"; 
    } 

    function follow_links($url) 
    { 
     global $already_crawled; 

     $options = array('http'=>array('method'=>'GET', 'headers'=>"User-Agent:howBot/0.1\n")); 

     $context=stream_context_create($options); 

     $doc = new DOMDocument(); 
     $doc->loadHTML(file_get_contents($url, false, $context)); 

     $linklist=$doc->getElementsByTagName("a"); 

     foreach($linklist as $link) 
     { 
      $l=$link->getAttribute("href"); 

      if(substr($l,0,1)=="/" && substr($l,0,2)!="//") 
      { 
       $l=parse_url($url)["scheme"]."://".parse_url($url)["host"].$l; 
      } 
      else if(substr($l,0,2)=="//") 
      { 
       $l = parse_url($url)["scheme"].":".$l; 
      } 
      else if(substr($l,0,2)=="./") 
      { 
       $l = parse_url($url)["scheme"]."://".parse_url($url)["host"].dirname(parse_url($url)["path"]).substr($l,1); 
      } 
      else if(substr($l,0,1)=="#") 
      { 
       $l = parse_url($url)["scheme"]."://".parse_url($url)["host"].parse_url($url)["path"].$l; 
      } 
      else if(substr($l,0,3)=="../") 
      { 
       $l = parse_url($url)["scheme"]."://".parse_url($url)["host"]."/".$l; 
      } 
      else if(substr($l,0,11)=="javascript:") 
      { 
       continue; 
      } 
      else if(substr($l,0,5)=="https" && (substr($l,0,4)=="http")) 
      { 
       $l=parse_url["scheme"].".//".parse_url($url)["host"]."/".$l; 
      } 
      if(!in_array($l,$already_crawled)) 
      { 
       $already_crawled[]=$l; 
       echo get_details($l); 
       //echo $l."\n"; 
      } 
     } 

    } 
    follow_links($start); 
    print_r($already_crawled); 
?> 

Answer 1

あなたは

function get_details($url) 
{ 
    $options = array('http'=>array('method'=>'GET', 'headers'=>"User-Agent:howBot/0.1\n")); 

    $context=stream_context_create($options); 

    $doc = new DOMDocument(); 
    @$doc->loadHTML(@file_get_contents($url, false, $context)); 

    $title=$doc->getElementsByTagName("title"); 
    if($title->length AND is_object($title)) 
    { 
     $title=$title->item(0)->nodeValue; 
    }else{ 
     $title=''; 
    } 


    echo $title."\n"; 
}