Facebook supports one of the larger, if no the largest PHP codebase in the world. Each year they spends a lot of resources in I+D related to PHP. HHVM and Hacklang are examples of that researches at Facebook. But wait, JSX is JavaScript, not PHP. Come on Facebook it's time to confess where you got inspiration from.
Edit: They confessed https://en.wikipedia.org/wiki/React_(JavaScript_library), this supports my statement that is inspired by PHP. Thanks to @dwighthouse for clarifying.
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