How do you make sure your deleted sensitive documents are really deleted? Drag it into recycle bin and empty it? Use ‘del’ in windows command prompt or ‘rm’ in linux?

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I found a problem while trying to do some bitwise operations (e.g. 32 bits XOR) in PHP. Consider the following case:


$a = -3036738507; // stored in float type
$b = 98758; // stored in integer type
$c= ($a & 0xFFFFFFFF) ^ $b;


Note: In PHP, if you specify a number beyond the bounds of the integer type, it will be interpreted as a float instead.

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How do you choose records randomly from MySQL database. Normally we will select all the related data from database and then store it to a buffer array. From the array, we randomly choose the records that we want.

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It is always a problem for Adsense publishers that always visit their own websites for testing purpose - Google Adsense will report additional Ad impression. The statistic at Google Adsense’s report becomes inaccurate and might affect the overall earning especially when publisher does a lot of testing on his/her own sites. When impression is increased, page CTR (click through rate) will be decreased and as well as eCPM (effective cost per 1000 impression).

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I used Cron to generate daily report (writen in PHP) of my website and send the report to my email inbox everyday automatically. Basically, Cron a utility in Unix/Linux that enables users to execute commands or scripts (groups of commands) automatically at a specified time/date.

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I have created an Adsense Tracker script to keep track adsense clicks on my websites. The scripts are pretty simple but can be expanded to generate a useful report. However, the scripts only work for ad unit and not ad link.

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Java Technology is celebrating its 10th birthday at JavaOne conference. You can read more about JavaOne conference here.

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