$aa[bar] will report an error, right? PHP will consider bar as a constant.
红月
红月 2020-07-20 14:31:18
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$aa[bar] will report an error, right? PHP will consider bar as a constant

红月
红月

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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

Tngtion

Variables with $

Strings with quotes

That’s either an array, a constant or a built-in function, right?

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