单词double-quotes
网络: 双引号
PHP must interpret the entire contents of anything inside double quotes to see if it has any variables that need to be evaluated.
PHP必须解释双引号中的整个内容以确认其中是否有任何需要评估的变量。
A value in double quotes is always a string, but a numeric value without quotes is interpreted as a number.
双引号中的值始终是字符串，而不带引号的数字值被认为是数字。
If you don"t know immediately what your SQL Query formula is going to be, enter double-quotes into the formula box.
如果不能立即知道SQL查询公式是什么，那么在公式框中输入双引号。
Here, the first string is defined with a pair of single quotes. The second one uses a pair of double quotes.
这里，第一个字符串使用一对单引号定义，第二个字符串使用一对双引号定义。
If an argument contains white space, the argument should be enclosed in double quotes "like this" .
如果参数中包含空白符，那么参数将被双引号引起来，“就象这样”。
Double quotes in Perl serve to interpret everything between them.
Perl中的双引号用于解释双引号之间的任何内容。
All values must be enclosed in a set of quotation marks (either single or double quotes).
所有值必须加上一对引号（单引号或双引号）。
characters enclosed in single or double quotes are copied to the result string , and do not affect formatting.
引在单引号或双引号中的字符被原样复制到输出字符串中，而且不影响格式化。
If either of these two special characters are used, the names must be enclosed in double quotes.
如果使用了两个特殊字符中的任何一个，则必须将名称包括在双引号中。
What benefit does this provide? Mainly, that the content inside the double quotes is not parsed, which provides you with more flexibility.
其优点主要在于，双引号中的内容不会被解析，这样便有了更大的灵活性。