W3TC Autoconfigurator

install.php

<?php

// Activate W3 Total Cache
if ( file_exists( WP_PLUGIN_DIR . '/w3-total-cache/w3-total-cache.php' ) )
	activate_plugin( WP_PLUGIN_DIR . '/w3-total-cache/w3-total-cache.php' , admin_url() );

// Load host specific W3TC config
if ( defined( 'W3TC_CONFIG_PATH' ) ) {

	// Set the configuration path based on the platform's abilities
	$config_path = realpath( dirname( __FILE__ ) ) . '/resources/w3-total-cache-config_default.php';
	
	// Copy our config to W3TC's default config path
	file_put_contents( W3TC_CONFIG_PATH, file_get_contents( $config_path ) );

	// Initialize 2 config objects
	$old_config = new W3_Config();      // Default config
	$new_config = new W3_Config();      // Our config

	// Load our config file
	$new_config->read( W3TC_CONFIG_PATH ); 

	// Overwrite the default config with our values
	$admin = w3_instance( 'W3_Plugin_TotalCacheAdmin' );
	$admin->config_save( $old_config, $new_config );

	// Disable W3TC preview mode
	if ( file_exists( W3TC_CONFIG_PREVIEW_PATH ) )
		unlink( W3TC_CONFIG_PREVIEW_PATH );
}