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<pre>
<?php
function checktables($html){
  $tables=preg_match_all('/<table /i',$html,$matches);
  $withsummary=preg_match_all('/<table [^>]*\bsummary=/i',$html,$matches);
  if($tables==$withsummary){
    $withsummary="all";
  }
  echo "I found $tables tables and $withsummary of them have summary atttribute.<br>";
}
$file='<table border="4" summary="Hi"></table><table border="7" summary="Hi33443"></table>';
checktables($file);
$file='<table border="4"></table><table border="7" summary="Hi33443"></table>';
checktables($file);
function checkth($html){
  $thcount=preg_match_all('#<th>#i',$html,$ths);
  $withabbr=preg_match_all('#<th>(?:(?!</th>).)*<abbr #is',$html,$ths);
  echo ($thcount==$withabbr) ? "Every th element I found had abbr attribute" : "I found th element with no abbr attibute";
  echo "<br>";
}
$file='<table border="4"><tr><th><abbr title="et cetera">etc.</abbr></th></tr></table><table border="7" summary="Hi33443"></table>';
checkth($file);
$file='<table border="4"><tr><th><abbr title="et cetera">etc.</abbr></th></tr></table><table border="7" summary="Hi33443"><tr><th>etc.</th></tr><tr><th><abbr title="yes">yeap.</abbr></th></tr></table>';
checkth($file);
?>