What does ob mean?

Ob stands for output buffer output buffer.

Buffer, also known as cache, is a part of memory space. In other words, a certain storage space is reserved in the memory space to buffer the input or output data, and this part of the reserved space is called buffer. Buffers are divided into input buffers and output buffers according to whether they correspond to input devices or output devices.

superiority

1. When output buffering is enabled, developers will reduce the number of interactions between the server and the client browser, because the entire HTML will be sent immediately, so output buffering provides a more time-saving method for larger projects.

2. Because the buffer stores the whole HTML as a string, we can use all string methods or user-defined methods to manipulate the HTML, thus providing greater flexibility when presenting the content.

3. Output buffering can provide faster, safer, more flexible and less redundant rendering methods; We can also apply various compression methods to create more efficient rendering.

4. Using the output buffer can make it easier to set cookie and use sessions, because the rest of the page is not included when sending header information.