Timer.php

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<?php
namespace Elgg;

class Timer {
    const MARKER_BEGIN = ':begin';
    const MARKER_END = ':end';

    private $times = [];

    public function begin(array $keys) {
        $this->getTreeNode($keys)[self::MARKER_BEGIN] = microtime();
    }

    public function end(array $keys) {
        $this->getTreeNode($keys)[self::MARKER_END] = microtime();
    }

    public function hasEnded(array $keys) {
        $node = $this->getTreeNode($keys);
        return isset($node[self::MARKER_END]);
    }

    public function getTimes() {
        return $this->times;
    }

    private function &getTreeNode(array $keys) {
        $arr =& $this->times;

        foreach ($keys as $key) {
            if (!isset($arr[$key])) {
                $arr[$key] = [];
            }
            $arr =& $arr[$key];
        }

        return $arr;
    }
}