mssql_field_length

Get the length of a field (PHP 3 >= 3.0.3, PHP 4, PHP 5)
int mssql_field_length ( resource result [, int offset] )

This function returns the length of field no. offset in result result. If offset is omitted, the current field is used.

Note to Win32 Users:

Due to a limitation in the underlying API used by PHP (MS DbLib C API), the length of VARCHAR fields is limited to 255. If you need to store more data, use a TEXT field instead.