$result = mysqli_query($pvcon,"'INSERT INTO content
^---
..... snip....
now())'");
^----
your entire query is wrong - you've enclosed it in '
-quotes, making the ENTIRE query a monolithic string. And your error call never works, because you've forgotten to include the link identifier in the call:
echo 'MySQL Error: ' . mysqli_error($pvcon);
^^^^^^--missing.
Plus, given the variable names you're using, you're probably ALSO vulnerable to SQL injection attacks, so enjoy having your server pwn3d on top of all this.