deepcode.net

The other day I was checking my feed reader and saw this post on lifehacker entitled “What the Numbers on Your Credit Card Mean”; Since I am always interested in learning, it led me to the Wikipedia page for the Luhn Algorithm.

Basically, the Luhn Algorithm allows you to, before actually processing the credit card, check the validity of a credit card number. Well, it sounded pretty awesome and a very easy initial validation. After reading the steps carefully, I looked over the Python code sample provided (top sample as of writing this) and decided I would write one in PHP in order to understand how it’s working and to test it using the card in my wallet. I posted it on Gist if anyone is interested.

When working to optimize either your own or someone else’s PHP code, it can be very useful to find out where the most time is being spent. This is especially true with long running cron scripts.

It’s pretty easy to do on a case-by-case basis, but after years of programming and writing the code to accomplish this, I decided it was easier to just create a Bench class.

The point of the Bench class is to allow me to add multiple data points throughout the code, and to show me the results upon completion of the script. I tried to make it as least obstructive as possible.

Please feel free to use and share this code as desired. If you run into any problems, or have any issues, let me know.

Bench.php Source Code:

Code block

<?php
/*
* author sgricci
* access public
* license gpl
* website http://deepcode.net
*/
class Bench {
	private $points = array();
	private $start;
 
	public function __construct() {
		$this->start = $this->utime();
	}
 
	private function utime()
	{
		$time = explode(" ", microtime());
		$usec = (double) $time[0];
		$sec = (double) $time[1];
		return ($sec + $usec);
	}
 
	public function pt($name = "")
	{
		if (!$name)
			$this->points[] = $this->utime();
		else
			$this->points[$name] = $this->utime();
	}
 
	public function __destruct()
	{
		$this->pt("total");
		foreach ($this->points as $name => $pt)
		{
			echo $name.": ".round(abs($this->start - $pt),4)."\n";
		}
	}
}
?>

Usage:

Code block

<?php
require_once "Bench.php";
$B = new Bench(); # Place at the beginning of the script.
// process some queries and then call
$B->pt("post-query process");
// process the data from the queries and then call
$B->pt("post-data process");
// go on with the rest of your script
?>