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copied!<p>The most often used solution is a strings file. E.g. like following:</p> <pre><code># library class Foo { public function __construct($lang = 'en') { $this->strings = require('path/to/langfile.' . $lang . '.php'); $this->message = $this->strings['callMeToo']; } public function callMeToo($user) { return sprintf($this->strings['callMeToo'], $user); } } # strings file return Array( 'callMeToo' => 'Hi %s, nice to meet you!' ); </code></pre> <p>You can, to avoid the <code>$this->message</code> assignment, also work with magic getters:</p> <pre><code># library again class Foo { # … code from above function __get($name) { if(!empty($this->strings[$name])) { return $this->strings[$name]; } return null; } } </code></pre> <p>You can even add a <code>loadStrings</code> method which takes an array of strings from the user and merge it with your internal strings table.</p> <p>Edit 1: To achieve more flexibility I would change the above approach a little bit. I would add a translation function as object attribute and always call this when I want to localize a string. The default function just looks up the string in the strings table and returns the value itself if it can't find a localized string, just like gettext. The developer using your library could then change the function to his own provided to do a completely different approach of localization.</p> <p>Date localization is not a problem. Setting the locale is a matter of the software your library is used in. The format itself is a localized string, e.g. <code>$this->translate('%Y-%m-%d')</code> would return a localized version of the date format string.</p> <p>Number localization is done by setting the right locale and using functions like <code>sprintf()</code>.</p> <p>Currency localization is a problem, though. I think the best approach would be to add a currency translation function (and, maybe for better flexibility, another number formatting function, too) which a developer could overwrite if he wants to change the currency format. Alternatively you could implement format strings for currencies, too. For example <code>%CUR %.02f</code> – in this example you would replace <code>%CUR</code> with the currency symbol. Currency symbols itself are localized strings, too.</p> <p>Edit 2: If you don't want to use <code>setlocale</code> you have to do a lot of work… basically you have to rewrite <code>strftime()</code> and <code>sprintf()</code> to achieve localized dates and numbers. Of course possible, but a lot of work.</p>

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