public function getMemoryUsage()
    {
        return isset($this->ends['mu']) && isset($this->starts['mu']) ? $this->ends['mu'] - $this->starts['mu'] : 0;
    }
public function getMemoryUsage()
    {
        return isset($this->ends['mu']) && isset($this->starts['mu']) ? $this->ends['mu'] - $this->starts['mu'] : 0;
    }
public function getMemoryUsage ( ) { return isset ( $ this -> ends [ 'mu' ] ) && isset ( $ this -> starts [ 'mu' ] ) ? $ this -> ends [ 'mu' ] - $ this -> starts [ 'mu' ] : 0 ; }
Returns the memory usage in bytes.

@return int
Returns the memory usage in bytes .