Not so much learn but to retain. Working in a web stack you end up having to juggle something like 5 languages at once (Your server language + SQL + HTML + CSS + JavaScript) not to mention these "micro-languages" like time formatting, imgsrc strings, etc. This is why ORMs and things like node.js are popular - to reduce the burden of dealing with a bunch of different languages.
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Not so much learn but to retain. Working in a web stack you end up having to juggle something like 5 languages at once (Your server language + SQL + HTML + CSS + JavaScript) not to mention these "micro-languages" like time formatting, imgsrc strings, etc. This is why ORMs and things like node.js are popular - to reduce the burden of dealing with a bunch of different languages.