(PECL swoole >= 1.9.0)
Swoole\Buffer::substr — Read data from the memory buffer based on offset and length. Or remove data from the memory buffer.
If $remove is set to be true and $offset is set to be 0, the data will be removed from the buffer. The memory for storing the data will be released when the buffer object is deconstructed.
offsetThe offset.
lengthThe length.
removeWhether to remove the data from the memory buffer.
The data or string readed from the memory buffer.