$aa[bar] will report an error, right? PHP will consider bar as a constant.
$aa[bar] will report an error, right? PHP will consider bar as a constant
$aa[bar] will report an error, right? PHP will consider bar as a constant
手机用户16286587182021-08-11 15:33:35
If you don’t add single quotes, there will be no error, and the results will be output as usual, but there will be a warning to remind you to add single quotes
Tngtion2020-07-21 09:04:02
Variables with $
Strings with quotes
That’s either an array, a constant or a built-in function, right?