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This package can manage ordered collections of data items.
It provides a class can that can append, replace and find arbitrary values in a buffer.
Another class can perform operations to manage a tree of buffers like entering a new buffer, activate a previous buffer, write data to the current buffer, or find a buffer by name.
Two PHP classes for creating and manipulating a hierarchy of output buffers.
buffer represents a single buffer, it has a name, a list of content
and an optional separator. The list of content consists of other buffers and data.
The following methods are defined:
append($data) -- append data (including buffer or array) to this buffer
clear() -- clear this buffer
replace($data) -- replace this buffer with new data
find($name) -- find a named buffer within this buffer
dump() -- make visual output of this buffer (for debugging)
__toString() -- output buffer content as a string
The second class
buffer_manager has methods for managing a stack of buffers.
current() -- return current buffer instance
enter($name) -- activate named buffer, if it does not exist: create and append to current buffer
leave() -- leave current buffer, activate previous active buffer
out($data) -- write data (string, buffer or array) to current active buffer
undo() -- remove current (newly created) buffer
find($name) -- find named buffer within root buffer
There are two demo files provided for each class, showing examples of how these
classes can be used.
- buffer_demo_1: Creating and manipulating a table of integers, using different separators
- buffer_demo_2: Creating HTML output, using buffers as templates
- buffer_manager_demo_1: Using the buffer manager for better control of HTML output
- buffer_manager_demo_2: More advanced examples of HTML template usage
Note that the first example is very different from the others. The buffer class is
very generic, it does not need to contain strings as values. However the __toString()
method will automatically cast each content member to a string. This means you can
use any scalars and even objects as data items, as long as they can be cast to
strings, i.e. they have a __toString() method.
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