Show literal "true"/"false" for boolean config values instead of "1"/empty string

features/config-get-field.feature

@@ -293,3 +293,59 @@ Feature: Get the value of a constant or variable defined in wp-config.php and wp
       ---
       - wp_cli_test
       """
+
+  Scenario: Get a boolean true constant from wp-config.php shows literal "true"
+    Given a WP install
+    And a wp-config.php file:
+      """
+      define( 'WP_DEBUG', true );
+      define( 'WP_DEBUG_LOG', false );
+      require_once( ABSPATH . 'wp-settings.php' );
+      """
+
+    When I run `wp config get WP_DEBUG`
+    Then STDOUT should be:
+      """
+      true
+      """
+
+    When I run `wp config get WP_DEBUG_LOG`
+    Then STDOUT should be:
+      """
+      false
+      """
+
+  Scenario: Get a boolean constant preserves native type for json and yaml formats
+    Given a WP install
+    And a wp-config.php file:
+      """
+      define( 'WP_DEBUG', true );
+      define( 'WP_DEBUG_LOG', false );
+      require_once( ABSPATH . 'wp-settings.php' );
+      """
+
+    When I run `wp config get WP_DEBUG --format=json`
+    Then STDOUT should be:
+      """
+      true
+      """
+
+    When I run `wp config get WP_DEBUG_LOG --format=json`
+    Then STDOUT should be:
+      """
+      false
+      """
+
+    When I run `wp config get WP_DEBUG --format=yaml`
+    Then STDOUT should be:
+      """
+      ---
+      - true
+      """
+
+    When I run `wp config get WP_DEBUG_LOG --format=yaml`
+    Then STDOUT should be:
+      """
+      ---
+      - false
+      """

features/config-list.feature

@@ -412,11 +412,70 @@ Feature: List the values of a wp-config.php file
       SECURE_AUTH_SALT='VNH|C>w-z?*dtP4ofy!v%RumM.}ug]mx7$QZW|C-R4T`d-~x|xvL{Xc_5C89K(,^'
       LOGGED_IN_SALT='Iwtez|Q`M l7lup; x&ml8^C|Lk&X[3/-l!$`P3GM$7:WI&X$Hn)unjZ9u~g4m[c'
       NONCE_SALT='QxcY|80 $f_dRkn*Liu|Ak*aas41g(q5X_h+m8Z$)tf6#TZ+Q,D#%n]g -{=mj1)'
-      WP_ALLOW_MULTISITE=1
-      MULTISITE=1
-      SUBDOMAIN_INSTALL=''
+      WP_ALLOW_MULTISITE=true
+      MULTISITE=true
+      SUBDOMAIN_INSTALL=false
       DOMAIN_CURRENT_SITE='example.com'
       PATH_CURRENT_SITE='/'
       SITE_ID_CURRENT_SITE=1
       BLOG_ID_CURRENT_SITE=1
       """
+
+  Scenario: List boolean constants shows literal "true" and "false" in table format
+    Given a WP install
+    And a wp-config.php file:
+      """
+      define( 'WP_DEBUG', true );
+      define( 'WP_DEBUG_LOG', true );
+      define( 'WP_DEBUG_DISPLAY', false );
+      require_once( ABSPATH . 'wp-settings.php' );
+      """
+
+    When I run `wp config list --fields=name,value,type --format=table`
+    Then STDOUT should be a table containing rows:
+      | name              | value | type     |
+      | WP_DEBUG          | true  | constant |
+      | WP_DEBUG_LOG      | true  | constant |
+      | WP_DEBUG_DISPLAY  | false | constant |
+
+  Scenario: List boolean constants preserves native boolean type for json format
+    Given a WP install
+    And a wp-config.php file:
+      """
+      define( 'WP_DEBUG', true );
+      define( 'WP_DEBUG_DISPLAY', false );
+      require_once( ABSPATH . 'wp-settings.php' );
+      """
+
+    When I run `wp config list WP_DEBUG --strict --format=json`
+    Then STDOUT should contain:
+      """
+      {"name":"WP_DEBUG","value":true,"type":"constant"}
+      """
+
+    When I run `wp config list WP_DEBUG_DISPLAY --strict --format=json`
+    Then STDOUT should contain:
+      """
+      {"name":"WP_DEBUG_DISPLAY","value":false,"type":"constant"}
+      """
+
+  Scenario: List boolean constants shows literal "true" and "false" in dotenv format
+    Given a WP install
+    And a wp-config.php file:
+      """
+      define( 'WP_DEBUG', true );
+      define( 'WP_DEBUG_DISPLAY', false );
+      require_once( ABSPATH . 'wp-settings.php' );
+      """
+
+    When I run `wp config list WP_DEBUG --strict --format=dotenv`
+    Then STDOUT should be:
+      """
+      WP_DEBUG=true
+      """
+
+    When I run `wp config list WP_DEBUG_DISPLAY --strict --format=dotenv`
+    Then STDOUT should be:
+      """
+      WP_DEBUG_DISPLAY=false
+      """

src/Config_Command.php

@@ -467,6 +467,14 @@ public function list_( $args, $assoc_args ) {
 			return array_walk( $values, array( $this, 'print_dotenv' ) );
 		}
 
+		if ( ! in_array( $assoc_args['format'], [ 'json', 'yaml' ], true ) ) {
+			foreach ( $values as $index => $value ) {
+				if ( is_bool( $value['value'] ) ) {
+					$values[ $index ]['value'] = $value['value'] ? 'true' : 'false';
+				}
+			}
+		}
+
 		Utils\format_items( $assoc_args['format'], $values, $assoc_args['fields'] );
 	}
 
@@ -514,6 +522,12 @@ public function list_( $args, $assoc_args ) {
 	 */
 	public function get( $args, $assoc_args ) {
 		$value = $this->get_value( $assoc_args, $args );
+		if ( is_bool( $value ) ) {
+			$format = Utils\get_flag_value( $assoc_args, 'format' );
+			if ( ! in_array( $format, [ 'json', 'yaml' ], true ) ) {
+				$value = $value ? 'true' : 'false';
+			}
+		}
 		WP_CLI::print_value( $value, $assoc_args );
 	}
 
@@ -1451,6 +1465,11 @@ private function print_dotenv( array $value ) {
 		$name           = strtoupper( $value['name'] );
 		$variable_value = isset( $value['value'] ) ? $value['value'] : '';
 
+		if ( is_bool( $variable_value ) ) {
+			WP_CLI::line( "{$name}=" . ( $variable_value ? 'true' : 'false' ) );
+			return;
+		}
+
 		$variable_value = str_replace( "'", "\'", $variable_value );
 
 		if ( ! is_numeric( $variable_value ) ) {