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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.
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557 |
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558 | /** |
559 | * Filters the locales requested for theme translations. |
560 | * |
561 | * @since 3.7.0 |
562 | * @since 4.5.0 The default value of the `$locales` parameter changed to include all locales. |
563 | * |
564 | * @param array $locales Theme locales. Default is all available locales of the site. |
565 | */ |
566 | $locales = apply_filters( 'themes_update_check_locales', $locales ); |
567 | $locales = array_unique( $locales ); |
568 |
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569 | if ( $doing_cron ) { |
570 | $timeout = 30; |
571 | } else { |
572 | // Three seconds, plus one extra second for every 10 themes. |
573 | $timeout = 3 + (int) ( count( $themes ) / 10 ); |
574 | } |
575 |
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