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add_query_arg › WordPress Function

Since1.5.0
Deprecatedn/a
› add_query_arg ( $args )
Parameters:
  • (mixed) $args Either a query variable key (string), its value (required; false removes the key), and an optional URL (string), or an associative array of query variables and an optional URL (string). If the URL is omitted or false, the current URL (`$_SERVER['REQUEST_URI']`) is used.
    Required: Yes
Returns:
  • (string) New URL query string (unescaped).
Defined at:
Codex:
Change Log:
  • 5.3.0

Retrieves a modified URL query string.

You can rebuild the URL and append query variables to the URL query by using this function. There are two ways to use this function; either a single key and value, or an associative array. Using a single key and value: add_query_arg( 'key', 'value', 'http://example.com'; ); Using an associative array: add_query_arg( array( 'key1' => 'value1', 'key2' => 'value2', ), 'http://example.com'; ); Omitting the URL from either use results in the current URL being used (the value of $_SERVER['REQUEST_URI']). Values are expected to be encoded appropriately with urlencode() or rawurlencode(). Setting any query variable's value to boolean false removes the key (see remove_query_arg()). Important: The return value of add_query_arg() is not escaped by default. Output should be late-escaped with esc_url() or similar to help prevent vulnerability to cross-site scripting (XSS) attacks.


Related Functions: add_users_page, add_user_meta, get_query_var, remove_query_arg, set_query_var

Source 

function add_query_arg( ...$args ) {
	if ( is_array( $args[0] ) ) {
		if ( count( $args ) < 2 || false === $args[1] ) {
			$uri = $_SERVER['REQUEST_URI'];
		} else {
			$uri = $args[1];
		}
	} else {
		if ( count( $args ) < 3 || false === $args[2] ) {
			$uri = $_SERVER['REQUEST_URI'];
		} else {
			$uri = $args[2];
		}
	}

	$frag = strstr( $uri, '#' );
	if ( $frag ) {
		$uri = substr( $uri, 0, -strlen( $frag ) );
	} else {
		$frag = '';
	}

	if ( 0 === stripos( $uri, 'http://' ) ) {
		$protocol = 'http://';
		$uri      = substr( $uri, 7 );
	} elseif ( 0 === stripos( $uri, 'https://' ) ) {
		$protocol = 'https://';
		$uri      = substr( $uri, 8 );
	} else {
		$protocol = '';
	}

	if ( str_contains( $uri, '?' ) ) {
		list( $base, $query ) = explode( '?', $uri, 2 );
		$base                .= '?';
	} elseif ( $protocol || ! str_contains( $uri, '=' ) ) {
		$base  = $uri . '?';
		$query = '';
	} else {
		$base  = '';
		$query = $uri;
	}

	wp_parse_str( $query, $qs );
	$qs = urlencode_deep( $qs ); // This re-URL-encodes things that were already in the query string.
	if ( is_array( $args[0] ) ) {
		foreach ( $args[0] as $k => $v ) {
			$qs[ $k ] = $v;
		}
	} else {
		$qs[ $args[0] ] = $args[1];
	}

	foreach ( $qs as $k => $v ) {
		if ( false === $v ) {
			unset( $qs[ $k ] );
		}
	}

	$ret = build_query( $qs );
	$ret = trim( $ret, '?' );
	$ret = preg_replace( '#=(&|$)#', '$1', $ret );
	$ret = $protocol . $base . $ret . $frag;
	$ret = rtrim( $ret, '?' );
	$ret = str_replace( '?#', '#', $ret );
	return $ret;
}