I have recently taken (and passed) certification exams for Zend PHP, MySQL Core, and LPI Linux 1. I work with these technologies every day and studied for these tests. Some of the questions were pretty difficult, and some were fairly easy. I think that anyone who has passed these tests does possess a least a minimum amount of knowledge about these subjects. Anyone can say they know something on a resume, but if you can prove you know at least a minimum before you are even interviewed... in my opinion that can only help when job hunting. And if your current employer pays for it, why not get certified for your resume's sake? But if your just trying to impress your coworkers and others already in the industry, I doubt that certs will help you out much.
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I have recently taken (and passed) certification exams for Zend PHP, MySQL Core, and LPI Linux 1. I work with these technologies every day and studied for these tests. Some of the questions were pretty difficult, and some were fairly easy. I think that anyone who has passed these tests does possess a least a minimum amount of knowledge about these subjects. Anyone can say they know something on a resume, but if you can prove you know at least a minimum before you are even interviewed... in my opinion that can only help when job hunting. And if your current employer pays for it, why not get certified for your resume's sake? But if your just trying to impress your coworkers and others already in the industry, I doubt that certs will help you out much.