WP_CLI

Runner::wp_is_readable() │ private │ WP-CLI 1.0

Are WordPress core files readable?

Method of the class: Runner{}

No Hooks.

Return

true|false.

Usage

// private - for code of main (parent) class only
$result = $this->wp_is_readable();

Runner::wp_is_readable() code WP-CLI 2.8.0-alpha

wp-cli/php/WP_CLI/Runner.php 
private function wp_is_readable() {
	return is_readable( ABSPATH . 'wp-includes/version.php' );
}