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Plugin_Upgrader::install( string $package, array $args = array() )

Install a plugin package.

Parameters

$package

(string) (Required) The full local path or URI of the package.

$args

(array) (Optional) Other arguments for installing a plugin package.

  • 'clear_update_cache'
    (bool) Whether to clear the plugin updates cache if successful. Default true.

Default value: array()

Return

(bool|WP_Error) True if the installation was successful, false or a WP_Error otherwise.

Source

File: wp-admin/includes/class-plugin-upgrader.php 

public function install( $package, $args = array() ) {
		$defaults    = array(
			'clear_update_cache' => true,
			'overwrite_package'  => false, // Do not overwrite files.
		);
		$parsed_args = wp_parse_args( $args, $defaults );

		$this->init();
		$this->install_strings();

		add_filter( 'upgrader_source_selection', array( $this, 'check_package' ) );

		if ( $parsed_args['clear_update_cache'] ) {
			// Clear cache so wp_update_plugins() knows about the new plugin.
			add_action( 'upgrader_process_complete', 'wp_clean_plugins_cache', 9, 0 );
		}

		$this->run(
			array(
				'package'           => $package,
				'destination'       => WP_PLUGIN_DIR,
				'clear_destination' => $parsed_args['overwrite_package'],
				'clear_working'     => true,
				'hook_extra'        => array(
					'type'   => 'plugin',
					'action' => 'install',
				),
			)
		);

		remove_action( 'upgrader_process_complete', 'wp_clean_plugins_cache', 9 );
		remove_filter( 'upgrader_source_selection', array( $this, 'check_package' ) );

		if ( ! $this->result || is_wp_error( $this->result ) ) {
			return $this->result;
		}

		// Force refresh of plugin update information.
		wp_clean_plugins_cache( $parsed_args['clear_update_cache'] );

		if ( $parsed_args['overwrite_package'] ) {
			/**
			 * Fires when the upgrader has successfully overwritten a currently installed
			 * plugin or theme with an uploaded zip package.
			 *
			 * @since 5.5.0
			 *
			 * @param string  $package          The package file.
			 * @param array   $new_plugin_data  The new plugin data.
			 * @param string  $package_type     The package type (plugin or theme).
			 */
			do_action( 'upgrader_overwrote_package', $package, $this->new_plugin_data, 'plugin' );
		}

		return true;
	}

Uses

Uses Description
wp-admin/includes/class-plugin-upgrader.php: upgrader_overwrote_package

Fires when the upgrader has successfully overwritten a currently installed plugin or theme with an uploaded zip package.
wp-admin/includes/class-plugin-upgrader.php: Plugin_Upgrader::install_strings()

Initialize the installation strings.
wp-admin/includes/plugin.php: wp_clean_plugins_cache()

Clears the plugins cache used by get_plugins() and by default, the plugin updates cache.
wp-includes/functions.php: wp_parse_args()

Merge user defined arguments into defaults array.
wp-includes/plugin.php: remove_action()

Removes a function from a specified action hook.
wp-includes/plugin.php: add_filter()

Hook a function or method to a specific filter action.
wp-includes/plugin.php: add_action()

Hooks a function on to a specific action.
wp-includes/plugin.php: remove_filter()

Removes a function from a specified filter hook.
wp-includes/plugin.php: do_action()

Execute functions hooked on a specific action hook.
wp-includes/load.php: is_wp_error()

Check whether variable is a WordPress Error.

Changelog

Version Description
3.7.0 The $args parameter was added, making clearing the plugin update cache optional.
2.8.0 Introduced.

© 2003–2019 WordPress Foundation
Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/classes/plugin_upgrader/install