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

@return int
Returns the peak memory usage in bytes .