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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 |
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605 |
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606 | /** |
607 | * Filter the language codes. |
608 | * |
609 | * @since MU |
610 | * |
611 | * @param array $lang_codes Key/value pair of language codes where key is the short version. |
612 | * @param string $code A two-letter designation of the language. |
613 | */ |
614 | $lang_codes = apply_filters( 'lang_codes', $lang_codes, $code ); |
615 | return strtr( $code, $lang_codes ); |
616 | } |
617 |
|
618 | /** |
619 | * Synchronize category and post tag slugs when global terms are enabled. |
620 | * |
621 | * @since 3.0.0 |
622 | * |
623 | * @param object $term The term. |