Passing variables into templates
Perch allows for variables to be set at runtime which are then available within templates.
Note: this will only work if the template is processed as the page loads, so it won’t work with
perch_content() as that renders the template when the content is edited. Use
Most page functions accept a
data option passed into their options array. This is an associative array with the key being the IDs and the value being the value you want to appear in the template.
perch_content_custom('My region', [ 'data' => [ 'colour' => 'red', 'fruit' => 'apple', 'season' => 'winter', ], ]);
PerchSystem class can be used to set variables at runtime which are then available within templates.
Note, this only works for templates which are parsed at runtime – such as content rendered with
perch_content_custom() rather than the precompiled output from
PerchSystem::set_var('name', 'value') you can do things like this:
PerchSystem::set_var('lang', 'en'); perch_content_custom('My region', [ 'template'=>'template.html' ]);
Then in your template:
<a href="/<perch:content id="lang">/contact/">Contact Us</a>
The variable set with
set_var() is passed into the template and merged with the regular content. You should think about avoiding ID collisions, and perhaps devise a naming scheme.
Bulk setting variables
You can also use the plural
PerchSystem::set_vars() to set multiple variables at once. It takes a PHP associative array with keys and values.
<?php PerchSystem::set_vars([ 'colour'=>'red', 'fruit'=>'apple', 'season'=>'winter' ]); ?>
Variables set will persist for the duration of the page load. They can be reset by using the same name again, or explicitly unset.
Getting values back
A variable previously set can be read back.
$lang = PerchSystem::get_var('lang');
Or all get be fetched at once, as an associative array.