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====== How {{macro}} template gets data for displaying? ======

%%{{macro}} usually works with plain PHP scalar values or arrays. However, if you want your objects to be fully supported in {{macro}}%% as well, make sure that your object supports [[http://www.php.net/~helly/php/ext/spl/interfaceArrayAccess.html|ArrayAccess]](in case of accessing attributes using dotted syntax) or [[http://www.php.net/~helly/php/ext/spl/interfaceIterator.html|Iterator]](in case of iteration).

There are two common ways to make some data appear inside a template:
  * **push** - data is pushed into template externally with some simple interface like **set($var, $name)** or **assign($var, $name)**. 
  * **pull** - template code fetches required data internally by using helpers or callbacks.

%%{{macro}}%% supports both of these approaches.


===== Push approach =====

lmbMacroTemplate has **set($variable_name, $value)** method that sets global variable $variable_name in the template. This variable will be available in template as {$#variable_name} or {$this->variable_name} expressions.

For example:
<code php>
$macro = new lmbMacroTemplate('page.phtml');
$macro->set('title', 'Hello');
</code>
To render 'title' in%% {{macro}}%% template we can use the following expression:
<code php>
{$#title}
</code>

There is also lmbMacroTemplate :: **setVars($associative_array)** that is equal to several set() method calls for every element of $associative_array. Note: setVars() removes previously assigned variables.

===== Pull approach =====

You can also use arbitrary PHP blocks right in %%{{macro}}%% templates to fetch data, e.g.:
<code xml>
<? $products = lmbActiveRecord :: find('Product'); ?>
{{list using='$products' as="$product"}}
<ul>
  {{list:item}}
    <li>{$product.title}</li>
  {{list:item}}
</ul>
{{/list}}
</code>

==== Data from lmbController ====

If you create an application based on WEB_APP package of Limb3, you may be interested to know that template can access all attributes of the currently executed controller(just like you called lmbMacroTemplate :: set() for every controller attribute).

For example:
<code php>
class MyController extends lmbController
{
  function doDisplay()
  {
    $this->title = 'Hello';
  }
}
</code>
In the corresponding %%{{macro}}%% template $title attribute will be available as:
<code php>
{$#title}
</code>

===== Contexts in {{macro}} =====

%%{{macro}}%% has only 2 contexts or data scopes:
  * **global** - scope of the generated PHP class of template
  * **local** - scope of one method of this class. 

Rendering always starts with render() method of the generated PHP class. Some tags like [[limb3:en:packages:macro:tags:core_tags:include_tag|{{include}}]] or [[limb3:en:packages:macro:tags:core_tags:apply_tag|{{apply}}]] generate their code into separate methods and thus create other local scopes. %%{{include}} and {{apply}}%% allow to pass any variables into their local scopes with any number of extra attributes (see descriptions of these tags).

See also [[expressions|output expressions]].