162100 message bar v2.0

New version 2.0 description:

1. Algorithm optimization and improved performance.

2. Add management background.

Program introduction:

1. A short and concise message bar program, no need to install a database

2. The program uses relational text database technology:

① Positioning and reading records - fast operation, the reading speed of the 100,000th record and the 100th record is the same

②Precisely store data - Precisely calculate the data storage location, position the writing, and only write the place where it should be written, instead of writing the entire data, so that there will be no data loss.

③No space is wasted - the free space left by deleted records is recorded in detail, optimally allocated, and fully utilized, with super strong load capacity

3. Administrator file: admin.php. Administrator initial password admin