TP framework about defining a constant address

TP Framework questions about defining constant addresses
Please take a look at the heroes of the road.




------to solve the idea----------------------
TP is very annoying, with a lot of bad people

The constants of PHP cannot be placed in a string!
Put in a string is the character

TP replaces manufacturing pseudo-constants with strings, confusing a lot of people
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What is the output of the above code {$Think. Const.img_url}?

Http://www.thinkphp.cn/topic/10043.html

See if there is a definition in the config file?

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