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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 |
|---|---|
| 521 | * @since 2.0.0 |
| 522 | */ |
| 523 | $GLOBALS['wp_roles'] = new WP_Roles(); |
| 524 | |
| 525 | /** |
| 526 | * Fires before the theme is loaded. |
| 527 | * |
| 528 | * @since 2.6.0 |
| 529 | */ |
| 530 | do_action( 'setup_theme' ); |
| 531 | |
| 532 | // Define the template related constants. |
| 533 | wp_templating_constants(); |
| 534 | |
| 535 | // Load the default text localization domain. |
| 536 | load_default_textdomain(); |
| 537 | |
| 538 | $locale = get_locale(); |
| 539 | $locale_file = WP_LANG_DIR . "/$locale.php"; |