为什么PHP变量要以$开头

问题描述

问 题

为什么PHP变量要以$开头???

$$又是什么意思?

这个问题已被关闭，原因：非技术提问的讨论型问题

解决方案

Because PHP was based on Perl which used $, though the symbols Perl used were meaningful and plenty used to indicate the data type, ( such as @ used to indicate an array ) PHP just has $.

PHP in its early stages was a simplistic version of Perl but over time incorporated more of Perl's features, though one may argue PHP is still a simplistic primitive version of Perl since to this day most installed versions of it don't include features that have been around in other languages forever, such as closures/namespacing.

http://en.wikipedia.org/wiki/PHP

Larry Wall, the creator of Perl, was inspired to use $ from shell

scripting:
http://en.wikipedia.org/wiki/Sigil_%28computer_programming%29

http://stackoverflow.com/questions/3073812/why-php-variables-start-with-a-sign-symbol

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