Question

我想将一个美元特性储存在一个购买力平价变量中。

$var = "pas$wd";

我发现以下错误:

Notice: Undefined variable: wd in C:xxxxx  on line x

帮助。

Answer 1

您可使用单一引文:

$var =  pas$wd ;

这样,变量就被推论。

Else, you can escape the $ sign, with a :

$var = "pas$wd";

And, for the sake of completness, with PHP >= 5.3, you could also use the NOWDOC (single-quoted) syntax :

$var = <<< STRING 
pas$wd
STRING;

As a reference, see the Strings page of the PHP manual (quoting a couple of sentences) :

Note: [...] variables and escape sequences for special characters will not be expanded when they occur in single quoted strings.

并且:

If the string is enclosed in double-quotes ("), PHP will interpret more escape sequences for special characters:
$ : dollar sign

Answer 2

单一字句禁止扩大:

var =  pas$wd ;

Answer 3

双重引证可促成不同的污染。因此,如果你使用双重引书,你需要从<>t>$上脱出来,否则你可以使用没有变异的推断。

$ var = "pas$wd";

或

$ var =  pas$wd ;

Answer 4

$var =  pas$wd ;
$var = "pas$wd";

Answer 5

Use the following code 
$var= pass$wd