Our wonderful little daughter, Amrita, turned 7 months on Feb 15th.
Writing back after quite a few months – have some more to share. Stay tuned!
Tag: al
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Superb march – Algorithm March
Japanese are so organized
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McDonalds is delicious!
Isn’t McDonalds delicious?
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Run a job every first Sun of a month
I came across an interesting cron issue recently. The requirement was to run a job every _first_ Sunday at 12:00PM of each month.
After searching across various sites, skimming through cron manpages, I finally found the following one-liner
0 0 1-7 * 0 <user> <job>Can you believe this simple solution? The reasoning is that Sun will be between 1 to 7th of each month. Once a Sun comes, the job will execute between 1st and 7th just once. After that any further Sundays will have a date greater than 7, and thus never execute!
Sometimes, the simplest solution is the most elegant. BTW, I had read about many other complicated solutions, such as having your own logic to determine the day, apple script, bash script solutions. I was about to give up, when I hit the jackpot! 😀
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Challenging Relativity
This sure is mind boggling if you look each detail separately
Original work can be seen on
http://www.andrewlipson.com/escher/relativity.html -
PHP code obfuscation possible?
Today at my project, I was faced with a simple question from the client – How do you ensure that your PHP code is not tampered?
Honestly, I had no answer. 🙁
The only ray of hope I thought was – Since PHP is interpreted, is there some compressing, or obfuscating tool out there that can help me?
One possible solution I came across was encrypting your logic entirely so as unreadable to humans
http://www.abhishektripathi.com/encrypting-footer-links-free-theme-developers-take-notice/
Is this failsafe? Can it be still reverse engineered, and original source obtained to defeat the original purpose of protecting your code?
Anyone to help out there?
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MySQL UTF-8
A very informative page (in Japanese) about MySQL and issues to enable correct UTF-8 data handling with client applications.
View original post -
MySQL’s killer feature
MySQL has a killer feature – you can have a timestamp field with DEFAULT as LOCALTIMESTAMP, so that when you insert a new record, the timestamp field will automatically have current timestamp inserted. But what about when the record is updated? Do you manually have to update the timestamp again? NO – MySQL allows you also specify another default on UPDATE so that whenever you update the record, it will automatically update the timestamp again.
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`timestamp` timestamp NOT NULL default CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
…Now, isn’t that a neat feature!
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Using Apache’s mod_rewrite on Windows
I recently happened to experiment with Apache’s mod_rewrite, an excellent library to change your machine friendly (or perhaps program friendly?) web urls into user friendly urls.
The steps to make mod_rewrite to work on Windows is-
– Edit httpd.conf for Apache, and uncomment the following line
# LoadModule rewrite_module modules/mod_rewrite.so
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LoadModule rewrite_module modules/mod_rewrite.so– Next, under <Directory “{Your document root}“> change
AllowOverride None
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AllowOverride All– Restart Apache
– Create a sample folder “rewrite” under {Your document root}, with the following files
{Your document root}
rewrite
.htaccess
details.php– What we will attempt now is to have a url like http://localhost/rewrite/details/shantibhushan to be automatically executed as http://localhost/rewrite/details.php?user=shantibhushan
– Edit your .htaccess file as follows
<IfModule rewrite_module>
RewriteEngine on
RewriteBase /rewrite/
RewriteRule ^details/(.+)$ details.php?user=$1 [L]
</IfModule>– The RewriteRule is the actual line where we specify what url is to be mapped to which actual url. ^details/(.+)$ takes a user friendly url /details/shantibhushan and extracts “shantibhushan” as $1. It then replaces $1 into details.php?user=$1 resulting in details.php?user=shantibhushan as the actual url.
– Edit details.php as follows
<?php
$user= $_REQUEST[‘user’];
print(“<h1>$user</h1>”);
?>
– The above sample simply takes “user” from details.php?user={user} and shows it back.– Done! Try accessing http://localhost/rewrite/details/shantibhushan and you should see details.php getting called with parameter as “shantibhushan”
TODO
– Simply accessing details/ results in error, and rewrite rule doesn’t assume such a case. It can be handled by RewriteCond
– First I wanted to have details:shantibhushan as the url, but this has a bug on Windows not allows : in path. It seems to work fine on non-Windows.
– The example assumes Apache is running on port 80 on your machine.
