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php7 was such a huge leap they skipped php6 (although there were other reasons for that).

> Version 6 is generally associated with failure in the world of dynamic languages. PHP 6 was a failure; Perl 6 was a failure. It's actually associated with failure also outside the dynamic language world - MySQL 6 also existed but never released.

TIL MySQL 6

https://wiki.php.net/rfc/php6

Whereas Python doesn't even plan for 4 because 3 hurt so bad

Meanwhile Java(ECMA)Script bucking the trend by getting its failure out of the way at 4.

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