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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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1604 |
|
1605 | /** |
1606 | * Filters the list of allowed hosts to redirect to. |
1607 | * |
1608 | * @since 2.3.0 |
1609 | * |
1610 | * @param string[] $hosts An array of allowed host names. |
1611 | * @param string $host The host name of the redirect destination; empty string if not set. |
1612 | */ |
1613 | $allowed_hosts = (array) apply_filters( 'allowed_redirect_hosts', array( $wpp['host'] ), isset( $lp['host'] ) ? $lp['host'] : '' ); |
1614 |
|
1615 | if ( isset( $lp['host'] ) && ( ! in_array( $lp['host'], $allowed_hosts, true ) && strtolower( $wpp['host'] ) !== $lp['host'] ) ) { |
1616 | $location = $fallback_url; |
1617 | } |
1618 |
|
1619 | return $location; |
1620 | } |
1621 | endif; |
1622 |
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