Displaying current branch in Wordpress Admin Area

functions.php

/**
 * Get the git branch
 * @return mixed Either the branch name or the HEAD content or a boolean false
 */
function get_current_git_commit() {
  if ( $hash = file_get_contents( get_home_path().'.git/HEAD' ) ) {
	preg_match('/ref: refs\/heads\/(.*)/', $hash, $matches, PREG_OFFSET_CAPTURE);
	if(count($matches)>=2) {
    	return $matches[1][0];
	} else {
		return $hash;
	}
  } else {
    return false;
  }
}

/**
 * Generic function to show a message to the user using WP's 
 * standard CSS classes to make use of the already-defined
 * message colour scheme.
 *
 * @param $message The message you want to tell the user.
 * @param $errormsg If true, the message is an error, so use 
 * the red message style. If false, the message is a status 
  * message, so use the yellow information message style.
 */
function showMessage($message, $errormsg = false)
{
	if ($errormsg) {
		echo '<div id="message" class="error">';
	}
	else {
		echo '<div id="message" class="updated fade">';
	}

	echo "<p><strong>$message</strong></p></div>";
} 

/**
 * Just show our message (with possible checking if we only want
 * to show message to certain users.
 */
function showAdminMessages()
{
	// Only show to admins, on non-PROD environment
	if (current_user_can('manage_options')) {
		require( get_home_path().'wp-config.php' );
		if(WP_ENV && WP_ENV != 'PROD'){
			$hash = get_current_git_commit();
			showMessage( sprintf( 'Vous êtes actuellement en : %s', WP_ENV ) );	
			if ($hash != 'master') {
				showMessage( sprintf( 'Attention, vous êtes sur la branche : %s', $hash ), true );	
			}
		}
	}
}

/** 
  * Call showAdminMessages() when showing other admin 
  * messages.
  */
add_action('admin_notices', 'showAdminMessages');