php在变量中写入双引号的文件

Question

I'm having problems when I try to write doble quotes from a variable into a text file. When a piece of text comes with a " text " the file is not created. I tried several things but nothing seems to work. By now I have to avoid write double quotes.

Here is my code in PHP :

<?php 

  $data = json_decode(stripslashes($_POST['data']));
  $name = json_decode(stripslashes($_POST['name']));
  $url_to = json_decode(stripslashes($_POST['url_to']));
  $saveToFile = $url_to . $name . '.srt';

  $space = "
";
  $blank = " ";
  $arrow = " --> ";

  if (isset($data))
  {

  $h = fopen($saveToFile, 'w+');
  if ($h) {
    foreach ($data as $sub) {
        fwrite($h,$sub->number);
        fwrite($h,$space);
        fwrite($h,$sub->start);
        fwrite($h,$arrow);
        fwrite($h,$sub->end);
        fwrite($h,$space);
        if(strpos($sub->text,'"')!==false){
            $sub->text = str_replace('"',"'",$sub->text);
            fwrite($h,$sub->text);
        } else {
            fwrite($h,$sub->text);
        }
        fwrite($h,$space);
        fwrite($h,$space);
    }
    fclose($h);
  }
  exit('Data Saved.');
 }
?>

To clarify some things: I get the text from a "stringified" JSON variable coming from a HTML5 front end page, and I write this text to a file, but if it comes with a double quote, nothing is written.

thanks