I learned this the hard way on my current project.
I'm building a CRM System in PHP/MySQL, and need a import utility for legacy adresses, which I decided to do in Perl. Now I planned 1 day for this utility from my experience of doing the required steps in PHP. Now I do know Perl nearly as well as PHP (I started with Perl and only came to PHP later on)
But simply the process of switching between the two environments has cost me almost one full day! I'm making mistakes I never thought I'd do agin...
[ by Martin>]
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