php get file extension name

getExtension.php

/**
* Get file extension
* @param $filePath
* @return string
*/
public function getExtension( $filePath )
{
    if( strpos( $filePath, '.' ) === false ){
        return '';
    }
    $temp_arr = $filePath ? explode( '.', $filePath ) : array();
    $ext = !empty( $temp_arr ) ? end( $temp_arr ) : '';
    return strtolower( $ext );
}