Remove double quotes from string

Hi,

I just switched from mSQL/lite to MySQL/php. I like it. But here is my
problem. I want to remove double quotes from a string.

I have tried:
  $quoteText = strtr($quoteText, """, " ");
  $quoteText = str_replace(""", " ", $quoteText);
--> Parsing error, obviously.

  $quoteText = strtr($quoteText, "\"", " ");
  $quoteText = str_replace("\"", " ", $quoteText);
--> No error but keeps the "\" in the new string.

Any suggestion?

Thanks!
Heiko