Php7 vs php8 php interview difference php developer

php 7 and php 8 represent significant milestones in the evolution of the php programming language, each introducing key enhancements that affect how developers approach their work. php 7, released in december 2015, focused on performance improvements, introducing the zend engine 3, which significantly increased execution speed and reduced memory consumption. it also added features like scalar type declarations and return type declarations, improving code quality.

in contrast, php 8, released in november 2020, brought more transformative changes, including the just-in-time (jit) compilation, which further enhances performance for certain types of applications. php 8 also introduced features like attributes (annotations), union types, and named arguments, promoting cleaner and more expressive code.

when interviewing php developers, emphasis often lies on their familiarity with these features, performance optimization techniques, and how they leverage the advancements in php 8 compared to php 7 in real-world applications. understanding these differences is crucial for modern development practices.
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