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1 | <?php |
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2 | /** |
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3 | * Locale API: WP_Locale_Switcher class |
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4 | * |
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5 | * @package WordPress |
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6 | * @subpackage i18n |
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7 | * @since 4.7.0 |
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8 | */ |
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9 | |||
10 | /** |
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11 | * Core class used for switching locales. |
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12 | * |
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13 | * @since 4.7.0 |
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14 | */ |
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15 | class WP_Locale_Switcher { |
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16 | /** |
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17 | * Locale stack. |
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18 | * |
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19 | * @since 4.7.0 |
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20 | * @access private |
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21 | * @var string[] |
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22 | */ |
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23 | private $locales = array(); |
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24 | |||
25 | /** |
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26 | * Original locale. |
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27 | * |
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28 | * @since 4.7.0 |
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29 | * @access private |
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30 | * @var string |
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31 | */ |
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32 | private $original_locale; |
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33 | |||
34 | /** |
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35 | * Holds all available languages. |
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36 | * |
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37 | * @since 4.7.0 |
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38 | * @access private |
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39 | * @var array An array of language codes (file names without the .mo extension). |
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40 | */ |
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41 | private $available_languages = array(); |
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42 | |||
43 | /** |
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44 | * Constructor. |
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45 | * |
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46 | * Stores the original locale as well as a list of all available languages. |
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47 | * |
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48 | * @since 4.7.0 |
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49 | */ |
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50 | public function __construct() { |
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51 | $this->original_locale = is_admin() ? get_user_locale() : get_locale(); |
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52 | $this->available_languages = array_merge( array( 'en_US' ), get_available_languages() ); |
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53 | } |
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54 | |||
55 | /** |
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56 | * Initializes the locale switcher. |
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57 | * |
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58 | * Hooks into the {@see 'locale'} filter to change the locale on the fly. |
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59 | */ |
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60 | public function init() { |
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61 | add_filter( 'locale', array( $this, 'filter_locale' ) ); |
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62 | } |
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63 | |||
64 | /** |
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65 | * Switches the translations according to the given locale. |
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66 | * |
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67 | * @since 4.7.0 |
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68 | * |
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69 | * @param string $locale The locale to switch to. |
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70 | * @return bool True on success, false on failure. |
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71 | */ |
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72 | public function switch_to_locale( $locale ) { |
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73 | $current_locale = is_admin() ? get_user_locale() : get_locale(); |
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74 | if ( $current_locale === $locale ) { |
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75 | return false; |
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76 | } |
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77 | |||
78 | if ( ! in_array( $locale, $this->available_languages, true ) ) { |
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79 | return false; |
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80 | } |
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81 | |||
82 | $this->locales[] = $locale; |
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83 | |||
84 | $this->change_locale( $locale ); |
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85 | |||
86 | /** |
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87 | * Fires when the locale is switched. |
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88 | * |
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89 | * @since 4.7.0 |
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90 | * |
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91 | * @param string $locale The new locale. |
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92 | */ |
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93 | do_action( 'switch_locale', $locale ); |
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94 | |||
95 | return true; |
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96 | } |
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97 | |||
98 | /** |
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99 | * Restores the translations according to the previous locale. |
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100 | * |
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101 | * @since 4.7.0 |
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102 | * |
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103 | * @return string|false Locale on success, false on failure. |
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104 | */ |
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105 | public function restore_previous_locale() { |
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106 | $previous_locale = array_pop( $this->locales ); |
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107 | |||
108 | if ( null === $previous_locale ) { |
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109 | // The stack is empty, bail. |
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110 | return false; |
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111 | } |
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112 | |||
113 | $locale = end( $this->locales ); |
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114 | |||
115 | if ( ! $locale ) { |
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116 | // There's nothing left in the stack: go back to the original locale. |
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117 | $locale = $this->original_locale; |
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118 | } |
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119 | |||
120 | $this->change_locale( $locale ); |
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121 | |||
122 | /** |
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123 | * Fires when the locale is restored to the previous one. |
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124 | * |
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125 | * @since 4.7.0 |
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126 | * |
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127 | * @param string $locale The new locale. |
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128 | * @param string $previous_locale The previous locale. |
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129 | */ |
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130 | do_action( 'restore_previous_locale', $locale, $previous_locale ); |
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131 | |||
132 | return $locale; |
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133 | } |
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134 | |||
135 | /** |
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136 | * Restores the translations according to the original locale. |
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137 | * |
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138 | * @since 4.7.0 |
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139 | * |
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140 | * @return string|false Locale on success, false on failure. |
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141 | */ |
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142 | public function restore_current_locale() { |
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143 | if ( empty( $this->locales ) ) { |
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144 | return false; |
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145 | } |
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146 | |||
147 | $this->locales = array( $this->original_locale ); |
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148 | |||
149 | return $this->restore_previous_locale(); |
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150 | } |
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151 | |||
152 | /** |
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153 | * Whether switch_to_locale() is in effect. |
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154 | * |
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155 | * @since 4.7.0 |
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156 | * |
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157 | * @return bool True if the locale has been switched, false otherwise. |
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158 | */ |
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159 | public function is_switched() { |
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160 | return ! empty( $this->locales ); |
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161 | } |
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162 | |||
163 | /** |
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164 | * Filters the WordPress install's locale. |
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165 | * |
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166 | * @since 4.7.0 |
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167 | * |
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168 | * @param string $locale The WordPress install's locale. |
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169 | * @return string The locale currently being switched to. |
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170 | */ |
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171 | public function filter_locale( $locale ) { |
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172 | $switched_locale = end( $this->locales ); |
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173 | |||
174 | if ( $switched_locale ) { |
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175 | return $switched_locale; |
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176 | } |
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177 | |||
178 | return $locale; |
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179 | } |
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180 | |||
181 | /** |
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182 | * Load translations for a given locale. |
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183 | * |
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184 | * When switching to a locale, translations for this locale must be loaded from scratch. |
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185 | * |
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186 | * @since 4.7.0 |
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187 | * @access private |
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188 | * |
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189 | * @global Mo[] $l10n An array of all currently loaded text domains. |
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190 | * |
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191 | * @param string $locale The locale to load translations for. |
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192 | */ |
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193 | private function load_translations( $locale ) { |
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194 | global $l10n; |
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195 | |||
196 | $domains = $l10n ? array_keys( $l10n ) : array(); |
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197 | |||
198 | load_default_textdomain( $locale ); |
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199 | |||
200 | foreach ( $domains as $domain ) { |
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201 | if ( 'default' === $domain ) { |
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202 | continue; |
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203 | } |
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204 | |||
205 | unload_textdomain( $domain ); |
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206 | get_translations_for_domain( $domain ); |
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207 | } |
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208 | } |
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209 | |||
210 | /** |
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211 | * Changes the site's locale to the given one. |
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212 | * |
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213 | * Loads the translations, changes the global `$wp_locale` object and updates |
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214 | * all post type labels. |
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215 | * |
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216 | * @since 4.7.0 |
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217 | * @access private |
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218 | * |
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219 | * @global WP_Locale $wp_locale The WordPress date and time locale object. |
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220 | * |
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221 | * @param string $locale The locale to change to. |
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222 | */ |
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223 | private function change_locale( $locale ) { |
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224 | // Reset translation availability information. |
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225 | _get_path_to_translation( null, true ); |
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226 | |||
227 | $this->load_translations( $locale ); |
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228 | |||
229 | $GLOBALS['wp_locale'] = new WP_Locale(); |
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230 | |||
231 | /** |
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232 | * Fires when the locale is switched to or restored. |
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233 | * |
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234 | * @since 4.7.0 |
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235 | * |
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236 | * @param string $locale The new locale. |
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237 | */ |
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238 | do_action( 'change_locale', $locale ); |
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239 | } |
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240 | } |
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241 |
In PHP, under loose comparison (like
==
, or!=
, orswitch
conditions), values of different types might be equal.For
string
values, the empty string''
is a special case, in particular the following results might be unexpected: