PHP file_put_contents没有保存，但没有显示错误/警告

Question

I'm trying to load a file, add some text and then save the file, I have this:

$css = file_get_contents("unzipped/$folder/style.css");
if(file_put_contents("ADD THIS " . $css, "unzipped/$folder/style.css")){
   echo("All Done!"); 
}

and even though 'All Done!' is echoed the contents of the file isn't changing.

Any ideas? :S

EDIT:

I also want to add that if I echo $css the contents of the file is shown correctly

Answer 1

The path to the file is the first argument to file_put_contents.

$css = file_get_contents("unzipped/$folder/style.css");
if(file_put_contents("unzipped/$folder/style.css", "ADD THIS " . $css)){
   echo("All Done!"); 
}