PHP Interview Questions And Answers

The answer to Advanced PHP Interview Question Part 1

Finally, we present our complete answer to the advanced PHP interview question part 1 below – with all the source code you need to answer the first portion of the question. You can also continue on to Part 2 of the PHP Interview Questions and Answers, or just click the next button below.

include('simple_html_dom.php');

$URL = $argv[1];

$totalSize = 0;

$totalNumResources = 0;

/*
check to see if the URL points to an HTML page,
if it doesn't then we are dealing with a single
file resource:
*/

if (!check_if_html($URL))
{
$totalSize = get_remote_file_size($URL);

echo "Final Total Download Size: $totalSize Bytes ";

$totalNumResources += 1;  //a single resource is still an HTTP request

echo "  Final total HTTP requests: $totalNumResources" ;

return;

}


/* at this point we know we are dealing with an HTML document
   which also counts as a resource, so increment the $totalNumResources
   variable by 1
*/

$totalNumResources += 1; 

$html = file_get_html($URL);

// find all images:
foreach($html->find('img') as $element){

    $size = get_remote_file_size($element->src);
  
    $totalSize = $totalSize + $size;  
    
    $totalNumResources += 1;

    /*
    echo "Total Size So Far: $totalSize.\n"; 
    
    echo "total resources: $totalNumResources .\n"; 

           echo "IMAGE SIZE: $size.\n";

           echo "$element->src.\n";
       */
}

// Find all CSS:
foreach($html->find('link') as $element)
{

 if (strpos($element->href,'.css') !== false) {

   $size = get_remote_file_size($element->href);
    
   $totalSize = $totalSize + $size; 
        
   $totalNumResources += 1;
 
   /*
    echo "total resources: $totalNumResources .\n"; 

    echo "Total Size So Far: $totalSize.\n"; 
  
    echo "$element->href.\n";    
    */
 }
     //only output the ones with 'css' inside...
}


//find all javascript:
foreach($html->find('script') as $element)
{

//check to see if it is javascript file:
if (strpos($element->src,'.js') !== false) {

   $size = get_remote_file_size($element->src);
   
   //echo " JS SIZE: $size.\n"; 

  $totalSize = $totalSize + $size;   
       
  $totalNumResources += 1;
  
 /*

   echo "Total Size So Far: $totalSize.\n"; 
       
  echo "total resources: $totalNumResources .\n"; 

        echo "$element->src.\n";  
 */
 }
}

echo "Final total download size: $totalSize Bytes" ;

echo "Final total HTTP requests: $totalNumResources";

function get_remote_file_size($url) {
    $headers = get_headers($url, 1);
    
    if (isset($headers['Content-Length'])) return $headers['Content-Length'];
    
    //this one checks for lower case "L" IN CONTENT-length:
    if (isset($headers['Content-length'])) return $headers['Content-length'];

    $c = curl_init();
     
    curl_setopt_array($c, array(
        CURLOPT_URL => $url,
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_HTTPHEADER => array('User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.1.3) Gecko/20090824 Firefox/3.5.3'),
        ));
   
   curl_exec($c);
    
    $size = curl_getinfo($c, CURLINFO_SIZE_DOWNLOAD);
    
    return $size;
        
    curl_close($c);

}


/*checks content type header to see if it is
   an HTML page...
*/

function check_if_html($url){
     $ch = curl_init($url);

     curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
     curl_setopt($ch, CURLOPT_HEADER, TRUE);
     curl_setopt($ch, CURLOPT_NOBODY, TRUE);

     $data = curl_exec($ch);
     $contentType = curl_getinfo($ch, CURLINFO_CONTENT_TYPE );

     curl_close($ch);
     
     if (strpos($contentType,'text/html') !== false)
   return TRUE;  // this is HTML, yes!
  else
     return FALSE;
}