Simple benchmark class that allows you write markers in code and get info about exec time, memory usage and more...

Benchmark.php

<?php
/*
 * The MIT License
 *
 * Copyright (c) 2016 Frantisek Preissler <github@ntisek.cz>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

namespace Pida42;

/**
 * @package      Pida42
 * @copyright    Copyright (c) 2016
 * @author       Frantisek Preissler <github@ntisek.cz>
 * @license      [MIT](http://en.wikipedia.org/wiki/MIT_License)
 * @encoding     UTF-8
 */
class Benchmark {
    
    // <editor-fold defaultstate="collapsed" desc="Properties">
    
    /** @var string Result metrics output type (default: array) */
    protected static $outputType = 'array';
    
    /** @var array Available output types that's are supported/implemented */
    protected static $outputTypeList = ['array', 'string', 'json'];

    // </editor-fold>

    // <editor-fold defaultstate="collapsed" desc="Cache">
    /**
     * Get a new (or already eixisting) instance using singleton.
     *
     * @static
     * @return \ArrayObject
     */
    public static function getCache() {

        // magic of singletons
        static $instance = null;

        // This is first time instance creation
        if (false === isset($instance)) {
            $instance = new \ArrayObject([], \ArrayObject::STD_PROP_LIST);
        }

        // Return already created instance
        return $instance;
    }

    /**
     * Check if exists item by index
     *
     * @param string $index
     *
     * @static
     * @return bool
     */
    public static function cacheExists($index) {

        return self::getCache()->offsetExists($index);
    }

    /**
     * Set value into cache
     *
     * @param string $index
     * @param mixed  $value
     *
     * @static
     * @return mixed
     */
    public static function cacheSet($index, $value) {

        return self::getCache()->offsetSet($index, $value);
    }

    /**
     * Get value by index
     *
     * @param string $index
     *
     * @static
     * @return bool
     */
    public static function cacheGet($index) {

        return self::getCache()->offsetGet($index);
    }
    // </editor-fold>

    // <editor-fold defaultstate="collapsed" desc="Helpers">
    /**
     * Get microtime
     *
     * @static
     * @return float
     */
    private static function _time() {
        
        return microtime(true);
    }
    
    /**
     * Return memory usage
     *
     * @static
     * @return int|null
     */
    private static function _memory() {
        
        // function is not supported
        if (false === function_exists('memory_get_usage')) {
            return null;
        }
        
        return memory_get_usage();
    }
    
    /**
     * Return memory peak
     *
     * @static
     * @return int|null
     */
    private static function _memoryPeak() {
        
        // function is not supported
        if (false === function_exists('memory_get_peak_usage')) {
            return null;
        }
        
        return memory_get_peak_usage();
    }
    
    /**
     * Return average server load
     *
     * @return array|null
     */
    private static function _serverLoad() {
        
        // function is not supported
        if (false === function_exists('sys_getloadavg')) {
            return null;
        }
        
        return sys_getloadavg();
    }
    
    /**
     * Get difference of arrays with keys intact
     *
     * @param array $arr1
     * @param array $arr2
     *
     * @static
     * @return array
     */
    private static function getRUsage($arr1, $arr2) {
        
        // result data
        $array = [];
        
        // Add user mode time.
        $arr1['ru_utime.tv'] = ($arr1['ru_utime.tv_usec'] / 1000000) + $arr1['ru_utime.tv_sec'];
        $arr2['ru_utime.tv'] = ($arr2['ru_utime.tv_usec'] / 1000000) + $arr2['ru_utime.tv_sec'];
        
        // Add system mode time.
        $arr1['ru_stime.tv'] = ($arr1['ru_stime.tv_usec'] / 1000000) + $arr1['ru_stime.tv_sec'];
        $arr2['ru_stime.tv'] = ($arr2['ru_stime.tv_usec'] / 1000000) + $arr2['ru_stime.tv_sec'];
        
        // Unset time splits.
        unset(
            $arr1['ru_utime.tv_usec'],
            $arr1['ru_utime.tv_sec'],
            $arr2['ru_utime.tv_usec'],
            $arr2['ru_utime.tv_sec'],
            $arr1['ru_stime.tv_usec'],
            $arr1['ru_stime.tv_sec'],
            $arr2['ru_stime.tv_usec'],
            $arr2['ru_stime.tv_sec']
        );
        
        // Iterate over values.
        foreach ($arr1 as $key => $value) {
            $array[$key] = ($arr2[$key] - $arr1[$key]);
        }
        
        return $array;
    }
    
    /**
     * Try to get stats using try{}catch() statement
     *
     * @param string $point
     *
     * @return array
     * @internal param string $slabel
     * @static
     */
    protected static function check($point) {
        
        try {
            return [
                'time'        => self::getTime($point),
                'usage'       => self::getUsage($point),
                'memory'      => self::getMemory($point),
                'peak_memory' => self::getMemoryPeak($point),
            ];
        }
        catch (\Exception $e) {
            return $e;
        }
    }
    // </editor-fold>
    
    // <editor-fold defaultstate="collapsed" desc="Common">
    /**
     * Mark point in code
     *
     * @param string      $point
     * @param null|string $outputType
     *
     * @static
     * @return void
     */
    public static function mark($point, $outputType = null) {

        self::setTime($point);
        self::setUsage($point, ($outputType ?: self::getOutputType()));
        self::setMemory($point);
        self::setMemoryPeak($point);
    }
    
    /**
     * Try to get report using try{}catch() statement
     *
     * @param string $point
     *
     * @static
     * @return array
     * @throws \Exception
     */
    public static function report($point) {

        try {
            // stats separately
            $results = self::check($point);

            // result array
            $result = [
                'ExecutionTime' => @$results['time'],
                'MemoryLimit'   => @rtrim(ini_get('memory_limit'), 'M'),
                'MemoryUsage'   => @$results['memory'],
                'PeakMemory'    => @$results['peak_memory'],
                'AvgServerLoad' => @self::_serverLoad()['0']
            ];

            return $result;
        }
        catch (Exception $e) {
            return $e;
        }
    }
    
    /**
     * Get result data
     *
     * @param null|string $outputType Target result format type
     *
     * @static
     * @return null|array|string
     */
    public static function usage($outputType = null) {
        
        // If is not set, use default
        if (null === $outputType) {
            $outputType = self::getOutputType();
        }
        
        if ('array' === $outputType) {
            return getrusage();
        }
        
        if ('string' === $outputType) {
            return str_replace('&', ', ', http_build_query(getrusage()));
        }
        
        if ('json' === $outputType) {
            return json_encode(getrusage());
        }
        
        return null;
    }
    // </editor-fold>
    
    // <editor-fold defaultstate="collapsed" desc="Getters/Setters - Output Type">
    /**
     * Set the output type for results
     *
     * @param string $outputType Output type
     *
     * @static
     * @return void
     * @throws \UnexpectedValueException
     * @see self::$outputTypeList
     */
    public static function setOutputType($outputType) {
        
        // defined format is not supported
        if (false === in_array(strtolower($outputType) . self::$outputTypeList)) {
            
            throw new \UnexpectedValueException(
                "Defined output type '{$outputType}' is not supported." .
                "Supported output types are: " . implode(',', self::$outputTypeList) . "."
            );
        }
        
        self::$outputType = strtolower($outputType);
    }
    
    /**
     * Get actual output type
     *
     * @static
     * @return string
     */
    public static function getOutputType() {
        
        return self::$outputType;
    }
    // </editor-fold>
    
    // <editor-fold defaultstate="collapsed" desc="Getters/Setters - Profile data">
    /**
     * Get time difference
     *
     * @param string $point
     *
     * @static
     * @return null|float
     */
    protected static function getTime($point) {
        
        // if any point is missing, so end with null returning
        if (false === self::cacheExists("{$point}_time_start") || false === self::cacheExists("{$point}_time_end")) {
            return null;
        }

        return (float) number_format((self::cacheGet("{$point}_time_end") - self::cacheGet("{$point}_time_start")), 5, '.', '');
    }
    
    /**
     * Set time by label
     *
     * @param string $point
     *
     * @static
     * @return void
     */
    protected static function setTime($point) {

        if (true === self::cacheExists("{$point}_time_start") && false === self::cacheExists("{$point}_time_end")) {
            self::cacheSet("{$point}_time_end", self::_time());
        }
        else {
            self::cacheSet("{$point}_time_start", self::_time());
        }
    }
    
    /**
     * Get usage difference
     *
     * @param string $point
     *
     * @static
     * @return null|array
     */
    protected static function getUsage($point) {
        
        // if any point is missing, so end with null returning
        if (false === self::cacheExists("{$point}_usage_start") || false === self::cacheExists("{$point}_usage_end")) {
            return null;
        }
        
        return self::getRUsage(self::cacheGet("{$point}_usage_start"), self::cacheGet("{$point}_usage_end"));
    }
    
    /**
     * Set usage by label
     *
     * @param string $point
     * @param string $outputType
     *
     * @static
     * @return void
     */
    protected static function setUsage($point, $outputType = null) {
        
        self::cacheSet($point, self::usage($outputType));
    }
    
    /**
     * Get memory usage difference (in MB)
     *
     * @param string $point
     *
     * @static
     * @return null|float
     */
    protected static function getMemory($point) {
        
        // if any point is missing, so end with null returning
        if (false === self::cacheExists("{$point}_memory_start") || false === self::cacheExists("{$point}_memory_end")) {
            return null;
        }
        
        return (float) number_format(((self::cacheGet("{$point}_memory_end") - self::cacheGet("{$point}_memory_start")) / 1024 / 1024), 5, '.', '');
    }
    
    /**
     * Set memory by label.
     *
     * @param string $point
     *
     * @static
     * @return void
     */
    protected static function setMemory($point) {

        if (true === self::cacheExists("{$point}_memory_start") && false === self::cacheExists("{$point}_memory_end")) {
            self::cacheSet("{$point}_memory_end", self::_memory());
        }
        else {
            self::cacheSet("{$point}_memory_start", self::_memory());
        }
    }
    
    /**
     * Get memory peak usage
     *
     * @param string $point
     *
     * @static
     * @return null|float
     */
    protected static function getMemoryPeak($point) {
        
        // if any point is missing, so end with null returning
        if (false === self::cacheExists("{$point}_peak_memory")) {
            return null;
        }
        
        return (float) number_format((self::cacheGet("{$point}_peak_memory") / 1024 / 1024), 5, '.', '');
    }
    
    /**
     * Set peak memory by label.
     *
     * @param string $point
     *
     * @static
     * @return void
     */
    protected static function setMemoryPeak($point) {
        
        self::cacheSet("{$point}_peak_memory", self::_memoryPeak());
    }
    // </editor-fold>
}