This is a small utility to enable dynamic locale strings to be injected into dynamic Perch templates.

To install the app, upload to the perch/addons/apps directory and add jw_translations to your config/apps.php.

Example:

<?php
	$apps_list = array(
		'content', 
		'categories',
		'jw_translations'
	);

To set the site locale, add a new entry into the perch config.php:

define('PERCH_TRANSLATION_LANG', 'en');

Translation files should be stored in perch/translations. The top level directories inside should be the locales. An example structure could be:

- translations
	-- en
	-- fr
	-- gr
	-- jp
	-- ru

The translation files are plain PHP files that return an array. For example, a translation file named controls.php may contain:

<?php return array(
    'buttons' => array(
        'save'    => 'Save Post',
        'payment' => 'Submit Payment',
        'delete'  => 'Delete Post'
    )
);

To use translations in template files, use the tag <perch:trans />. Using the example file above, to output a button using the save string would look like this:

<button>
	<perch:trans id="controls.buttons.save" />
</button>

The ID attribute uses a dot notation syntax to load the correct string. Nested directories require additional dots:

/en/blog/controls.php ~> blog.controls.buttons.save

It is also possible to set a default fallback, in the event a translation cannot be found:

<button>
	<perch:trans id="controls.buttons.save" default="Save" />
</button>

The global locale can be granularly overwritten using the lang attribute:

<button>
	<perch:trans id="controls.buttons.save" lang="fr" />
</button>	

In some cases, you may need to pass template data back into the translation strings, for example a user may be presented with a personalised welcome message on logging in. This can be acheived using placeholders.

In the translation file, setting a placeholder looks like this:

<?php return array(
    'messages' => array(
        'welcome'    => 'Hello, :username - welcome back'
    )
);

To pass data from the template, prepend 'placeholder-' to the name and use as an attribute:

<div class="alert">
	<perch:trans id="alerts.messages.welcome" placeholder-username="<perch:content id="member_name" />" />
</div>

If translations are required outside of Perch templates, the get_translation function is available.

It takes 3 parameters:

• The ID string
• An options array (optional)
• Return true / false

A full example looks like:

get_translation('controls.button.save', array(
    'default' => 'Save',
    'lang'    => 'fr',
    'placeholders' => array(
        'username' => 'John Smith'
    )
), false);

Setting the third parameter to true will return the value rather than output:

$button_label = get_translation('controls.button.save', array(), true);