tomar el tiempo de ejecucion de partes del codigo.

chronos.php

<?php

class Chronometer
{
    private $start = [];
    private $end   = [];

    public function start(string $name = 'default'): void
    {
        $this->start[$name] = microtime(true);
    }

    public function end(string $name = 'default'): void
    {
        $this->end[$name] = microtime(true);
    }

    public function totalExecution(string $name = 'default'): float
    {
        return ($this->end[$name] - $this->start[$name]);
    }

    public function totalExecutionMin(string $name = 'default'): float
    {
        return ($this->totalExecution($name) / 60);
    }
}

example.php

<?php
  
  public example function(){
     $chronometer = New Chronometer();
     $chronometer->start('app');
     //do app things
     $chronometer->start('usersUpdate');
      foreach ($users as $key => $value) {
        # do things to each user
      }
    $chronometer->end('usersUpdate');
    # Do more things
    $chronometer->end('app');
    var_dump('The user update toke ' . $chronometer->totalExecution('usersUpdate'))
    var_dump('The app toke ' . $chronometer->totalExecution('app'))
 
}