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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 |
|---|---|
| 539 | |
| 540 | /** |
| 541 | * Filters the language codes. |
| 542 | * |
| 543 | * @since MU (3.0.0) |
| 544 | * |
| 545 | * @param string[] $lang_codes Array of key/value pairs of language codes where key is the short version. |
| 546 | * @param string $code A two-letter designation of the language. |
| 547 | */ |
| 548 | $lang_codes = apply_filters( 'lang_codes', $lang_codes, $code ); |
| 549 | return strtr( $code, $lang_codes ); |
| 550 | } |
| 551 | |
| 552 | /** |
| 553 | * Displays an access denied message when a user tries to view a site's dashboard they |
| 554 | * do not have access to. |
| 555 | * |
| 556 | * @since 3.2.0 |
| 557 | * @access private |