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Are global variables in PHP considered bad practice? If so, why?

...l way. I generally have a variable that contains the system configuration, and when I nead to access this variable in a function, I do global $var; . ...
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What is the difference between Spring, Struts, Hibernate, JavaServer Faces, Tapestry?

... Spring is an IoC container (at least the core of Spring) and is used to wire things using dependency injection. Spring provides additional services like transaction management and seamless integration of various other technologies. Struts is an action-based presentation framework (...
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How to extract an assembly from the GAC?

...om VS project. Developers usually keep a copy of the original DLL file and refer to it in the project at development (design) time, which uses the assembly from GAC during run-time of the project. During execution (run-time) if the assembly is found to be signed and deployed in ...
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Retina displays, high-res background images

...wer, here is the retina detection query I tend to use: @media only screen and (-webkit-min-device-pixel-ratio: 2), only screen and ( min--moz-device-pixel-ratio: 2), only screen and ( -o-min-device-pixel-ratio: 2/1), only screen and ( min-device-pixel-ratio: 2), only screen and ( ...
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Most lightweight way to create a random string and a random hexadecimal number

What is the most lightweight way to create a random string of 30 characters like the following? 13 Answers ...
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How does one write code that best utilizes the CPU cache to improve performance?

...aiting for a memory request to be fulfilled (avoiding the memory latency), and as a second effect, possibly to reduce the overall amount of data that needs to be transfered (preserving memory bandwidth). Techniques for avoiding suffering from memory fetch latency is typically the first thing to con...
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Is there a good Valgrind substitute for Windows?

... Insure++ takes forever to instrument your code, and forever to execute your code at runtime. – C Johnson Aug 9 '10 at 15:12 add a comment ...
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Replacing H1 text with a logo image: best method for SEO and accessibility?

...o.png" alt="Stack Overflow" /> </a> </h1> title in href and img to h1 is very, very important! share | improve this answer | follow | ...
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How to preventDefault on anchor tags?

...ATE: I've since changed my mind on this solution. After more development and time spent working on this, I believe a better solution to this problem is to do the following: <a ng-click="myFunction()">Click Here</a> And then update your css to have an extra rule: a[ng-click]{ cu...
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How are ssl certificates verified?

...eps needed to securely verify a ssl certificate? My (very limited) understanding is that when you visit an https site, the server sends a certificate to the client (the browser) and the browser gets the certificate's issuer information from that certificate, then uses that to contact the issuerer, ...