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{$action}

do_action_deprecated( “{$action}” )

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If the ‘postcustom’ meta box is enabled, then we need to perform some extra initialization on it.

Source

} elseif ( isset( $_POST['addmeta'] ) && $_POST['addmeta'] ) {
	$location = add_query_arg( 'message', 2, wp_get_referer() );
	$location = explode( '#', $location );
	$location = $location[0] . '#postcustom';
} elseif ( isset( $_POST['deletemeta'] ) && $_POST['deletemeta'] ) {
	$location = add_query_arg( 'message', 3, wp_get_referer() );
	$location = explode( '#', $location );

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