<?php
$handle = fopen('temp.txt','r+') ;
$contents = fread($handle, filesize ("temp.txt")) ;
fclose ($handle) ;
$datas = explode("\n",$contents) ;
$final_data = array() ;
$temp = null;
$i = 0 ;
while ($i < count($datas))
{
  if (preg_match('/\"\;/',$datas[$i]))
  {
    $final_data[] = $temp.$datas[$i];
    $temp = null;
  }
  else
  {
    $temp .= "\n".$datas[$i];
  }
  $i++;
}
print_r($final_data) ;
?>

fichier temp.txt :

test;test1;"blablabla";ok;
tegdgsst;test89;"blhfablabla
fzefdsf
fdsfdsezf
fdsfdsfsd";ogk;
tesgfst;teseet1;"blablgfdgabla";grok;