Simple PHP Profiling Performance

ReallySimplePHPprofiling.php

<?php
/* ----- Profiling.php ----- */

class Profiling {

    public $messages = [];
    protected $profile;
    protected $current_time;

    public function __construct($profile) {
        $this->profile = $profile;
        $this->current_time = microtime(true);
    }

    public function prof_flag($str) {
        if (!$this->profile) {
            return;
        }
        $this->messages[$str] = ['event' => $str,'time' => round(microtime(true) - $this->current_time, 2)];
    }

    public function prof_print() {
        if (!$this->profile) {
            return;
        }
        $out = [];
        foreach($this->messages as $mess) {
            $time = (float) $mess['time'];
            $out[] = "Event: {$mess['event']} , Time: $time";
        }
        return "\n". implode("\n", $out) ."\n";
    }

}

/* ----- TO USE , sample.php ----- */
require_once "Profiling.php";

$profile = new Profiling(true);

$profile->prof_flag("Start");

/* SOME CODE TO PROFILE */

$profile->prof_flag("Got Request Data");

/* SOME MORE CODE TO PROFILE */

$profile->prof_flag("Complete.");
// Print or Log results
$profile->prof_print();

/*----- OUTPUT: -----
Event: Start , Time: 0
Event: Got Request Data , Time: 0.02
Event: Complete. , Time: 0.05
*/