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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 124 | /** |
| 125 | * Filters the locale for the current request prior to the default determination process. |
| 126 | * |
| 127 | * Using this filter allows to override the default logic, effectively short-circuiting the function. |
| 128 | * |
| 129 | * @since 5.0.0 |
| 130 | * |
| 131 | * @param string|null $locale The locale to return and short-circuit. Default null. |
| 132 | */ |
| 133 | $determined_locale = apply_filters( 'pre_determine_locale', null ); |
| 134 | |
| 135 | if ( $determined_locale && is_string( $determined_locale ) ) { |
| 136 | return $determined_locale; |
| 137 | } |
| 138 | |
| 139 | if ( |
| 140 | isset( $GLOBALS['pagenow'] ) && 'wp-login.php' === $GLOBALS['pagenow'] && |
| 141 | ( ! empty( $_GET['wp_lang'] ) || ! empty( $_COOKIE['wp_lang'] ) ) |
| 142 | ) { |