' 和 " 和有什么不一样?在 PHP 中?
可能的重复:
PHP:不同的引号?
简单的问题:
php 中的 ' 和 " 有什么区别?我应该什么时候使用?
What is the difference between ' and " in php? When should I use either?
推荐答案
基本上,单引号字符串是纯文本,几乎没有特殊情况,而双引号字符串具有可变插值(例如 echo "Hello $username";
) 以及转义序列,例如
"(换行符.)
Basically, single-quoted strings are plain text with virtually no special case whereas double-quoted strings have variable interpolation (e.g. echo "Hello $username";
) as well as escaped sequences such as "
" (newline.)
您可以在 PHP 手册中了解有关字符串的更多信息.
You can learn more about strings in PHP's manual.
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