Updates for issue processwire/processwire-issues#215 to better support locale settings on front-end, plus add $languages->setLocale() and $languages->getLocale() methods, and freshen up code and docs in related classes.

wire/core/Selectors.php

@@ -391,6 +391,7 @@ class Selectors extends WireArray {
 				$operator = $op;
 				$not = true;
 			} else {
+				if(is_array($value)) $value = implode('|', $value);
 				$debug = $this->wire('config')->debug ? "field='$field', value='$value', selector: '$this->selectorStr'" : "";
 				throw new WireException("Unknown Selector operator: '$operator' -- was your selector value properly escaped? $debug");
 			}
@@ -434,7 +435,7 @@ class Selectors extends WireArray {
 				}
 			}
 
-			if($field || strlen("$value")) {
+			if($field || $value || strlen("$value")) {
 				$selector = $this->create($field, $operator, $value);
 				if(!is_null($group)) $selector->group = $group; 
 				if($quote) $selector->quote = $quote; 

wire/modules/LanguageSupport/LanguageSupport.module

@@ -182,8 +182,8 @@ class LanguageSupport extends WireData implements Module, ConfigurableModule {
 		}
 
 		$this->wire('config')->dateFormat = $this->_('Y-m-d H:i:s'); // Sortable date format used in the admin
-		$locale = $this->_('C'); // Value to pass to PHP's setlocale(LC_ALL, 'value') function when initializing this language // Default is 'C'. Specify '0' to skip the setlocale() call (and carry on system default).
-		if($locale != '0') setlocale(LC_ALL, $locale); 
+		$locale = $this->_('C'); // Value to pass to PHP's setlocale(LC_ALL, 'value') function when initializing this language // Default is 'C'. Specify '0' to skip the setlocale() call (and carry on system default). Specify CSV string of locales to try multiple locales in order.
+		if($locale != '0') $languages->setLocale(LC_ALL, $locale); 
 
 		// setup our hooks handled by this class
 		$this->addHookBefore('Inputfield::render', $this, 'hookInputfieldBeforeRender');

wire/modules/LanguageSupport/LanguageSupportPageNames.module

@@ -3,9 +3,13 @@
 /**
  * Multi-language support page names module
  *
- * ProcessWire 3.x, Copyright 2016 by Ryan Cramer
+ * ProcessWire 3.x, Copyright 2017 by Ryan Cramer
  * https://processwire.com
  * 
+ * @property int $moduleVersion
+ * @property int $inheritInactive
+ * @property int $useHomeSegment
+ *
  */
 
 class LanguageSupportPageNames extends WireData implements Module, ConfigurableModule {
@@ -129,7 +133,10 @@ class LanguageSupportPageNames extends WireData implements Module, ConfigurableM
 
 		// verify that page path doesn't have mixed languages where it shouldn't
 		$redirectURL = $this->verifyPath($this->requestPath);
-		if($redirectURL) return $this->wire('session')->redirect($redirectURL); 
+		if($redirectURL) {
+			$this->wire('session')->redirect($redirectURL);
+			return;
+		}
 
 		$page = $this->wire('page'); 
 
@@ -179,6 +186,9 @@ class LanguageSupportPageNames extends WireData implements Module, ConfigurableM
 	 *
 	 * It extracts the language segment and uses that to later set the language
 	 * 
+	 * @param string $path
+	 * @return string
+	 *
 	 */
 	public function updatePath($path) {
 		if($path === '/' || !strlen($path)) return $path;
@@ -270,6 +280,7 @@ class LanguageSupportPageNames extends WireData implements Module, ConfigurableM
 		if(!$setLanguage) $setLanguage = $languages->get('default'); 
 		$user->language = $setLanguage; 
 		$this->setLanguage = $setLanguage;
+		$languages->setLocale();
 	
 		// if $page is the 404 page, exit out now
 		if($page->id == $config->http404PageID) return '';
@@ -361,9 +372,13 @@ class LanguageSupportPageNames extends WireData implements Module, ConfigurableM
 	/**
 	 * Hook in before ProcesssPageView::execute to capture and modify $_GET[it] as needed
 	 * 
+	 * @param HookEvent $event
+	 *
 	 */
 	public function hookProcessPageViewExecute(HookEvent $event) {
-		$event->object->setDelayRedirects(true); 
+		/** @var ProcessPageView $process */
+		$process = $event->object;
+		$process->setDelayRedirects(true); 
 		// save now, since ProcessPageView removes $_GET['it'] when it executes
 		$it = isset($_GET['it']) ? $_GET['it'] : '';
 		$this->requestPath = $it; 
@@ -378,8 +393,12 @@ class LanguageSupportPageNames extends WireData implements Module, ConfigurableM
 	/**
 	 * Hook in before ProcesssPageView::render to throw 404 when appropriate
 	 * 
+	 * @param HookEvent $event
+	 * @throws WireException
+	 *
 	 */
 	public function hookPageRender(HookEvent $event) {
+		if($event) {}
 		if($this->force404) {
 			$this->force404 = false; // prevent another 404 on the 404 page
 			throw new Wire404Exception();
@@ -391,11 +410,15 @@ class LanguageSupportPageNames extends WireData implements Module, ConfigurableM
 	 *
 	 * May be passed a Language name or page to check viewable for that language
 	 * 
+	 * @param HookEvent $event
+	 *
 	 */
 	public function hookPageViewable(HookEvent $event) {
 		if(!$event->return) return;
+		/** @var Page $page */
 		$page = $event->object;
 		// if(wire('user')->isSuperuser() || $page->editable()) return;
+		/** @var Language $language */
 		$language = $event->arguments(0);
 		if(!$language) return;
 		if(is_string($language)) $language = $this->wire('languages')->get($this->wire('sanitizer')->pageNameUTF8($language));
@@ -408,9 +431,13 @@ class LanguageSupportPageNames extends WireData implements Module, ConfigurableM
 	/**
 	 * Hook into WirePageEditor (i.e. ProcessPageEdit) to remove the non-applicable default home name of 'home'
 	 * 
+	 * @param HookEvent $event
+	 *
 	 */
 	public function hookWirePageEditorExecute(HookEvent $event) {
-		$page = $event->object->getPage();
+		/** @var WirePageEditor $editor */
+		$editor = $event->object; 
+		$page = $editor->getPage();
 		if($page && $page->id == 1) {
 			if($page->name == Pages::defaultRootName) $page->name = '';
 		}
@@ -421,6 +448,8 @@ class LanguageSupportPageNames extends WireData implements Module, ConfigurableM
 	 *
 	 * Adds additional inputs for each language
 	 * 
+	 * @param HookEvent $event
+	 *
 	 */
 	public function hookInputfieldPageNameRenderAfter(HookEvent $event) {
 
@@ -490,12 +519,18 @@ class LanguageSupportPageNames extends WireData implements Module, ConfigurableM
 	 *
 	 * @todo Just move this to the InputfieldPageName module rather than using hooks
 	 * 
+	 * @param HookEvent $event
+	 *
 	 */
 	public function hookInputfieldPageNameProcess(HookEvent $event) {
 
+		/** @var InputfieldPageName $inputfield */
 		$inputfield = $event->object; 
 		//$page = $this->process == 'ProcessPageEdit' ? $this->process->getPage() : new NullPage();
-		$page = $this->process->getPage();
+		/** @var WirePageEditor $process */
+		$process = $this->process; 
+		/** @var Page $page */
+		$page = $process instanceof WirePageEditor ? $process->getPage() : new NullPage();
 		if($page->id && !$page->editable('name', false)) return; // name is not editable
 		$input = $event->arguments[0];
 		/** @var Languages $languages */
@@ -534,9 +569,12 @@ class LanguageSupportPageNames extends WireData implements Module, ConfigurableM
 	/**
 	 * Hook into PageFinder::getQuery to add language status check
 	 * 
+	 * @param HookEvent $event
+	 *
 	 */
 	public function hookPageFinderGetQuery(HookEvent $event) {
 		$query = $event->return;
+		/** @var PageFinder $pageFinder */
 		$pageFinder = $event->object; 
 		$options = $pageFinder->getOptions();
 		
@@ -556,8 +594,11 @@ class LanguageSupportPageNames extends WireData implements Module, ConfigurableM
 	/**
 	 * Hook into Page::path to localize path for current language
 	 * 
+	 * @param HookEvent $event
+	 *
 	 */
 	public function hookPagePath(HookEvent $event) {
+		/** @var Page $page */
 		$page = $event->object; 
 		if($page->template == 'admin') return;
 		$language = $this->wire('user')->get('language'); 
@@ -571,6 +612,8 @@ class LanguageSupportPageNames extends WireData implements Module, ConfigurableM
 	 * event param Language|string|int Optional language 
 	 * event return string Localized language name or blank if not set
 	 * 
+	 * @param HookEvent $event
+	 *
 	 */
 	public function hookPageLocalName(HookEvent $event) {
 		$page = $event->object; 
@@ -587,8 +630,11 @@ class LanguageSupportPageNames extends WireData implements Module, ConfigurableM
 	 * event param Language|string|int Optional language 
 	 * event return string Localized language path
 	 * 
+	 * @param HookEvent $event
+	 *
 	 */
 	public function hookPageLocalPath(HookEvent $event) {
+		/** @var Page $page */
 		$page = $event->object; 
 		$language = $this->getLanguage($event->arguments(0)); 
 		$event->return = $this->getPagePath($page, $language); 	
@@ -600,8 +646,11 @@ class LanguageSupportPageNames extends WireData implements Module, ConfigurableM
 	 * event param Language|string|int Optional language 
 	 * event return string Localized language URL
 	 * 
+	 * @param HookEvent $event
+	 *
 	 */
 	public function hookPageLocalUrl(HookEvent $event) {
+		/** @var Page $page */
 		$page = $event->object; 
 		$language = $this->getLanguage($event->arguments(0)); 
 		$event->return = $this->wire('config')->urls->root . ltrim($this->getPagePath($page, $language), '/'); 	
@@ -613,6 +662,8 @@ class LanguageSupportPageNames extends WireData implements Module, ConfigurableM
 	 * event param Language|string|int Optional language
 	 * event return string Localized language name or blank if not set
 	 * 
+	 * @param HookEvent $event
+	 *
 	 */
 	public function hookPageLocalHttpUrl(HookEvent $event) {
 		$this->hookPageLocalUrl($event); 
@@ -650,6 +701,8 @@ class LanguageSupportPageNames extends WireData implements Module, ConfigurableM
 	/**
 	 * Update pages table for new column when a language is added
 	 * 
+	 * @param Language|Page $language
+	 *
 	 */
 	public function languageAdded(Page $language) {
 		if(!$language->id || $language->name == 'default') return;
@@ -669,6 +722,8 @@ class LanguageSupportPageNames extends WireData implements Module, ConfigurableM
 	/**
 	 * Hook called when language is added
 	 * 
+	 * @param HookEvent $event
+	 *
 	 */
 	public function hookLanguageAdded(HookEvent $event) {
 		$language = $event->arguments[0]; 
@@ -678,6 +733,8 @@ class LanguageSupportPageNames extends WireData implements Module, ConfigurableM
 	/**
 	 * Update pages table to remove column when a language is deleted
 	 * 
+	 * @param Language|Page $language
+	 *
 	 */
 	protected function languageDeleted(Page $language) {
 		if(!$language->id || $language->name == 'default') return;
@@ -696,6 +753,8 @@ class LanguageSupportPageNames extends WireData implements Module, ConfigurableM
 	/**
 	 * Hook called when language is deleted
 	 * 
+	 * @param HookEvent $event
+	 *
 	 */
 	public function hookLanguageDeleted(HookEvent $event) {
 		$language = $event->arguments[0]; 
@@ -708,6 +767,8 @@ class LanguageSupportPageNames extends WireData implements Module, ConfigurableM
 	 * Here we make use of the 'extraData' return property of the saveReady hook
 	 * to bundle in the language name fields into the query.
 	 * 
+	 * @param HookEvent $event
+	 *
 	 */
 	public function hookPageSaveReady(HookEvent $event) {
 
@@ -782,6 +843,7 @@ class LanguageSupportPageNames extends WireData implements Module, ConfigurableM
 	 */
 	public function hookPageSetupNew(HookEvent $event) {
 	
+		/** @var Page $page */
 		$page = $event->arguments[0];
 		
 		// if page already has a name, then no need to continue
@@ -821,6 +883,8 @@ class LanguageSupportPageNames extends WireData implements Module, ConfigurableM
 	/**
 	 * Hook called immediately after a page is saved
 	 * 
+	 * @param HookEvent $event
+	 * 
 	 */
 	public function hookPageSaved(HookEvent $event) {
 		// The setLanguage may get lost upon some page save events, so this restores that
@@ -926,6 +990,8 @@ class LanguageSupportPageNames extends WireData implements Module, ConfigurableM
 	/**
 	 * Check to make sure that the status table exists and creates it if not
 	 * 
+	 * @param bool $force
+	 *
 	 */
 	public function checkModuleVersion($force = false) {
 
@@ -962,6 +1028,9 @@ class LanguageSupportPageNames extends WireData implements Module, ConfigurableM
 	/**
 	 * Module interactive configuration fields
 	 * 
+	 * @param array $data
+	 * @return InputfieldWrapper
+	 *
 	 */
 	public function getModuleConfigInputfields(array $data) {
 

wire/modules/LanguageSupport/Languages.php

@@ -29,6 +29,7 @@
  * @method added(Page $language) Hook called when Language is added #pw-hooker
  * @method deleted(Page $language) Hook called when Language is deleted #pw-hooker
  * @method updated(Page $language, $what) Hook called when Language is added or deleted #pw-hooker
+ * @method languageChanged($fromLanguage, $toLanguage) Hook called when User language is changed #pw-hooker
  *
  */
 
@@ -37,6 +38,8 @@ class Languages extends PagesType {
 	/**
 	 * Reference to LanguageTranslator instance
 	 * 
+	 * @var LanguageTranslator
+	 *
 	 */
 	protected $translator = null;
 
@@ -94,6 +97,14 @@ class Languages extends PagesType {
 	 */
 	protected $editableCache = array();
 
+	/**
+	 * Construct
+	 *
+	 * @param ProcessWire $wire
+	 * @param array $templates
+	 * @param array $parents
+	 * 
+	 */
 	public function __construct(ProcessWire $wire, $templates = array(), $parents = array()) {
 		parent::__construct($wire, $templates, $parents);
 		$this->wire('database')->addHookAfter('unknownColumnError', $this, 'hookUnknownColumnError');
@@ -107,9 +118,15 @@ class Languages extends PagesType {
 	 *
 	 */
 	public function translator(Language $language) {
-		if(is_null($this->translator)) $this->translator = $this->wire(new LanguageTranslator($language)); 
-			else $this->translator->setCurrentLanguage($language);
-		return $this->translator; 
+		/** @var LanguageTranslator $translator */
+		$translator = $this->translator;
+		if(is_null($translator)) {
+			$translator = $this->wire(new LanguageTranslator($language));
+			$this->translator = $translator;
+		} else {
+			$translator->setCurrentLanguage($language);
+		}
+		return $translator; 
 	}
 
 	/**
@@ -349,6 +366,110 @@ class Languages extends PagesType {
 		return true;
 	}
 	
+	/**
+	 * Set the current locale
+	 *
+	 * This function behaves exactly the same way as [PHP setlocale](http://php.net/manual/en/function.setlocale.php) except
+	 * for the following:
+	 *
+	 * - If the $locale argument is omitted, it uses the locale setting translated for the current user language.
+	 * - You can optionally specify a CSV string of locales to try for the $locale argument. 
+	 * - You can optionally or a “category=locale;category=locale;category=locale” string for the $locale argument.
+	 *   When this type of string is used, the $category argument is ignored. 
+	 * - This method does not accept more than the 2 indicated arguments. 
+	 * 
+	 * See the PHP setlocale link above for a list of constants that can be used for the `$category` argument. 
+	 * 
+	 * ~~~~~
+	 * // Set locale to whatever settings defined for current $user language
+	 * $languages->setLocale(); 
+	 * 
+	 * // Set all locale categories 
+	 * $languages->setLocale(LC_ALL, 'en_US.UTF-8'); 
+	 * 
+	 * // Set locale for specific category (CTYPE)
+	 * $langauges->setLocale(LC_CTYPE, 'en_US.UTF-8'); 
+	 * 
+	 * // Try multiple locales till one works (in order) using array
+	 * $languages->setLocale(LC_ALL, [ 'en_US.UTF-8', 'en_US', 'en' ]);
+	 * 
+	 * // Same as above, except using CSV string
+	 * $languages->setLocale(LC_ALL, 'en_US.UTF-8, en_US, en'); 
+	 * 
+	 * // Set multiple categories and locales (first argument ignored)
+	 * $languages->setLocale(null, 'LC_CTYPE=en_US;LC_NUMERIC=de_DE;LC_TIME=es_ES'); 
+	 * ~~~~~
+	 * 
+	 * @param int $category Specify a PHP “LC_” constant or omit (or null) for default (LC_ALL).
+	 * @param string|array|null $locale Specify string, array or CSV string of locale name(s), or omit (null) for default language locale.
+	 * @return string|bool Returns the locale that was set or boolean false if requested locale cannot be set.
+	 * @see Languages::getLocale()
+	 *
+	 */
+	public function setLocale($category = LC_ALL, $locale = null) {
+		
+		$setLocale = ''; // return value
+		if($category === null) $category = LC_ALL;	
+
+		if($locale === null) {
+			// argument omitted means set according to language settings
+			$locale = __('C', 'wire--modules--languagesupport--languagesupport-module');
+		}
+
+		if(is_string($locale)) {
+			
+			if(strpos($locale, ',') !== false) {
+				// convert CSV string to array of locales
+				$locale = explode(',', $locale);
+				foreach($locale as $key => $value) {
+					$locale[$key] = trim($value);
+				}
+				
+			} else if(strpos($locale, ';') !== false) {
+				// multi-category and locale string, i.e. LC_CTYPE=en_US.UTF-8;LC_NUMERIC=C;LC_TIME=C
+				foreach(explode(';', $locale) as $s) {
+					// call setLocale() for each locale item present in the string
+					if(strpos($s, '=') === false) continue;
+					list($cats, $loc) = explode('=', $s); 
+					$cat = constant($cats);
+					if($cat !== null) {
+						$loc = $this->setLocale($cat, $loc);
+						if($loc !== false) $setLocale .= trim($cats) . '=' . trim($loc) . ";";
+					}
+				}
+				$setLocale = rtrim($setLocale, ';');
+				if(empty($setLocale)) $setLocale = false;
+			}
+		}
+
+		if($setLocale === '') {
+			if($locale === '0' || $locale === 0) {
+				// get locale (to be consistent with behavior of PHP setlocale)
+				$setLocale = $this->getLocale($category);
+			} else {
+				// set the locale
+				$setLocale = setlocale($category, $locale);
+			}
+		}
+
+		return $setLocale;
+	}
+
+	/**
+	 * Return the current locale setting
+	 * 
+	 * If using LC_ALL category and locales change by category, the returned string will be in 
+	 * the format: “category=locale;category=locale”, and so on. 
+	 *
+	 * @param int $category Optionally specify a PHP LC constant (default=LC_ALL)
+	 * @return string|bool Locale(s) string or boolean false if not supported by the system. 
+	 * @see Languages::setLocale()
+	 *
+	 */
+	public function getLocale($category = LC_ALL) {
+		return setlocale($category, '0');
+	}
+
 	/**
 	 * Hook called when a language is deleted
 	 *