Adds a rewrite rule that transforms a URL structure to a set of query vars.

Description

Any value in the $after parameter that isn’t ‘bottom’ will result in the rule being placed at the top of the rewrite rules.

Parameters

$regexstringrequired

Regular expression to match request against.

$querystring|arrayrequired

The corresponding query vars for this rewrite rule.

$afterstringoptional

Priority of the new rule. Accepts 'top' or 'bottom'. Default 'bottom'.

Default:'bottom'

Source

public function add_rule( $regex, $query, $after = 'bottom' ) {
	if ( is_array( $query ) ) {
		$external = false;
		$query    = add_query_arg( $query, 'index.php' );
	} else {
		$index = ! str_contains( $query, '?' ) ? strlen( $query ) : strpos( $query, '?' );
		$front = substr( $query, 0, $index );

		$external = $front !== $this->index;
	}

	// "external" = it doesn't correspond to index.php.
	if ( $external ) {
		$this->add_external_rule( $regex, $query );
	} else {
		if ( 'bottom' === $after ) {
			$this->extra_rules = array_merge( $this->extra_rules, array( $regex => $query ) );
		} else {
			$this->extra_rules_top = array_merge( $this->extra_rules_top, array( $regex => $query ) );
		}
	}
}

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