简单-html-dom的后备规则

Question

I'm trying to write a small scraper to do things more automatically,
so far it's been doing the job nearly perfect - i'm missing fallback rules for older pages)

i'll try to explain myself,
currently i'm picking up title with $html->find('h1[class=TitWhite22]')
but some of the pages contain older format where instead of being on class=Titwhite22 it might appear with class=textwhite16 (or any other class for that matter).

my basic function is:

foreach($html->find('h1[class=TitWhite22]') as $element){
    $titleName = $element->innertext;
}

how can i set a rule that if the specific class isn't there, it should attempt a different class ?

Answer 1

The below code may resolve your problem.

$count22 = 0;

foreach($html->find('h1[class=TitWhite22]') as $element)
{ 
 $count22 = $count22+1;
}

if($count22==0)
{
  $count16=0;
  foreach($html->find('h1[class=TexttWhite16]') as $element1)
  {
    $count16 = $count16+1;
  }
  if($count16==0)
  {
    $count12=0;  
    foreach($html->find('h1[class=TitWhite12]') as $element2)
    {
      $count12=$count12+1;
    }
    if($count12==0)
      echo "All Fail";
    else
    {
      foreach($html->find('h1[class=TitWhite12]') as $element2)
      {
        $titleName12= $element2->innertext;
      }
    }
  }
  else
  {
    foreach($html->find('h1[class=TexttWhite16]') as $element1)
    {
        $titleName16= $element2->innertext;
    }
  }  
}
else
{
   foreach($html->find('h1[class=TitWhite22]') as $element)
   { 
     $titleName22= $element->innertext;
   }
}