为什么 PHP 变量以 $ 符号开头？
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Why PHP variables start with a $ sign symbol?
提问by Bakhtiyor
Has anybody ever thought about this question. Why we must write $var_name = value;and not var_name = value;? Yes I know that it is the syntax rule that PHP uses, but why is it a $sign symbol?
有没有人想过这个问题。为什么我们必须写$var_name = value;而不是var_name = value;？是的，我知道这是 PHP 使用的语法规则，但为什么它是$符号？
回答by meder omuraliev
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 $.
因为 PHP 是基于 Perl 的，它使用了$，虽然 Perl 使用的符号是有意义的，并且大量用于表示数据类型，（例如用于表示数组的@）PHP 只是有$.
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 was for a long time a simplistic primitive version of Perl since before PHP 5.3 it did not include features that have been around in other languages such as closures/namespacing.
PHP 在其早期阶段是 Perl 的一个简单版本，但随着时间的推移，它包含了更多 Perl 的功能，尽管有人可能会争辩说 PHP 在很长一段时间内都是 Perl 的简单原始版本，因为在 PHP 5.3 之前，它不包括已经存在的功能其他语言，例如闭包/命名空间。
http://en.wikipedia.org/wiki/PHP
http://en.wikipedia.org/wiki/PHP
Larry Wall, the creator of Perl, was inspired to use $from shell scripting: http://en.wikipedia.org/wiki/Sigil_%28computer_programming%29
Perl 的创建者 Larry Wall 的灵感$来自 shell 脚本：http: //en.wikipedia.org/wiki/Sigil_%28computer_programming%29
回答by Cole
This has been common in computer languages for a long time, that's all. Long before Perl, too! For instance, check out Commodore 64 BASIC
长期以来，这在计算机语言中很常见，仅此而已。早在 Perl 之前！例如，查看 Commodore 64 BASIC
10 PRINT "WHAT IS YOUR NAME?"
20 INPUT A$
30 IF A$="BAHKTIYOR" THEN PRINT "HEY CHECK OUT THAT DOLLAR SIGN"
In BASIC the $ was after the variable name, however.
然而，在 BASIC 中，$ 在变量名之后。
回答by Artelius
Prepending all variables with $ makes the code somewhat easier to parse, and fits in with the "Hello $var" variable-embedded-in-string idea.
在所有变量前面加上 $ 使代码更容易解析，并且符合“Hello $var”变量嵌入字符串的想法。
回答by Zuul
Funny answer:
有趣的答案：
Think in PHP variables as persons, you name a person and assign it a job!
将 PHP 变量视为人，您命名一个人并为其分配工作！
But that person will refuse to work if you don't pay, so, provide a dollar in first hand :)
但是如果你不付钱，那个人会拒绝工作，所以，直接提供一美元:)
$Hyman = "drive my car" ;
$Hyman = "开我的车" ;
Just bringing fun to the "Game"! Enjoy!
只是给“游戏”带来乐趣！享受！
Regarding a real answer:
关于真正的答案：
The $ sign was chosen in early times of computer coding, because it was a sign present in virtually all char set codes, and a sign rarely needed within programming languages!
在早期的计算机编码中选择了 $ 符号，因为它是几乎所有字符集代码中都存在的符号，并且在编程语言中很少需要符号！
