$html = '<div class="outerClass"><p class="pClassTop">Subject One</p><p class="pClassLarge">I need this!!</p></div>
<div class="outerClass"><p class="pClassTop">Subject Two</p><p class="pClassLarge">I also need this value!!</p></div>
<div class="outerClass"><p class="pClassTop">Subject Three</p><p class="pClassLarge">And lastly this one too!!</p></div>';
preg_match_all('/class="pClassLarge">(.*?)<\/p>/s',$html,$arrayMatches);
$classLargeValues = $arrayMatches[1];
print_r($classLargeValues);
$htm = <<<EOD
file_get_html('myHTMLsaveInFile.txt');
EOD;