str_replace双引号和单引号

Question

I have a simple PHP script that should escape both single and double quotes with a backslash. Here is my code:

$output = str_replace('"','\"',$input);
$output = str_replace("'","\'",$output);
return $output;

Problem is, it only escapes the double quote, so a string like

"This" is a 'string'

parses out to be

\"This\" is a 'string'

not

\"This\" is a \'string\'

If I change the second line to

$output = str_replace("'","asdf",$output);

I get

\"This\" is a asdfstringasdf

Any ideas what is going wrong?

Thanks

Answer 1

Problem solved. I was viewing the output in my browser's console, which for some reason was showing the backslash for double quotes, but not singles. View source showed that it was working properly.