src/includes/classes/Core/Utils/Benchmark.php
public function start(bool $save_last = true)
    {
        $this->stats = [];

        if ($save_last) {
            $this->last_time = $this->this_time;
        }
        $this->this_time = 0; // Init.
        $this->started   = microtime(true);
    }
public function start(bool $save_last = true)
    {
        $this->stats = [];

        if ($save_last) {
            $this->last_time = $this->this_time;
        }
        $this->this_time = 0; // Init.
        $this->started   = microtime(true);
    }
Start (initialize).

@since 150424 Benchmarking.

@param bool $save_last Save last time?