measure and log code runtime

code_runtime_measurement.php

<?php

class my_class {
    
    private $_timerId = [];

    private function startTimer($timerId) {
        $this->_timerId[$timerId]['start'] = microtime(true);
    }
    private function stopTimer($timerId) {
        $this->_timerId[$timerId]['stop'] = microtime(true);
    }
    private function getDuration($timerId, $stopTimer = true) {
        if ($stopTimer === true) {
            $this->stopTimer($timerId);
            $duration = $this->_timerId[$timerId]['stop'] - $this->_timerId[$timerId]['start'];
            $this->_timerId[$timerId]['duration'] = $duration;
        } else {
            $duration = microtime(true) - $this->_timerId[$timerId]['start'];
        }
        return $duration;
    }
    private function logDuration($timerId, $stopTimer = true, $customMessage = '') {
        $backtrace = debug_backtrace();
        $line = $backtrace[0]['line'];
        $msg = $timerId. ';' .$line.';'. $this->getDuration($timerId, $stopTimer) . ';' . $customMessage . PHP_EOL;
        file_put_contents('performance.log', $msg, FILE_APPEND);
    }
    
    
    /**
     * Example:
     */
    
    public function demo1() {
        $this->startTimer('total');
        
        echo 'complicated operation';
        
        $this->logDuration('total', false);
        
        echo 'another complicated operation';
        
        $this->logDuration('total);
        
    }
}