I am doing a real estate feed for a portal and it is telling me the max length of a string should be 20,000 bytes (20kb), but I have never run across this before.
How can I measure byte size of a varchar string. So I can then do a while loop to trim it down.
No, it is not always x2 for UTF-8 and changes based on the actual contents. For ASCII characters it is 1 byte, but can go into several bytes for large code-point values. You want:
string s = // your string
int len = Encoding.UTF8.GetByteCount(s);
Your code is right, the below line will give you the size in bytes:
size=$_FILES['image']['size'];
You can also get the file size after the file has been uploaded this way:
echo filesize($perDestination) . ' bytes';
This option will also give you the file size in bytes
You have to figure out if the string is ascii encoded or encoded with a multi-byte format.
In the former case, you can just use
strlen.In the latter case you need to find the number of bytes per character.
the strlen documentation gives an example of how to do it : http://www.php.net/manual/en/function.strlen.php#72274