I think it really depends on the work you are doing. If most of the team knows a language and can deliver the project effectively, that's the preferred way. Many developers may have had these experiences as well and not used PHP. This might explain the "Why should I be concerned with PHP if we didn't use it."
You've pointed out some great examples for those whom may not have used PHP in the past and are curious why it is still popular. Me personally, I'm coming back to PHP after years away, and love the new updates in 7.1.
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