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"Python has one. Ruby has one. Clojure has one. Now PHP has one too. Boris is PHP's missing REPL (read-eval-print loop), allowing developers to experiment with PHP code in the terminal in an interactive manner. If you make a mistake, it doesn't matter, Boris will report the error and stand to attention for further input." I use PHP increasingly little, but the lack of a REPL drives me insane. This looks… useful, at the very least.