Why does php need complex(curly) syntax to parse associative array values in a string

This question might be a duplicate of why in array single quotes not required according to the syntax

but I didn't the explanation I need over there. We know we can do echo "$myArr[0]", but we can't do the same with associative arrays like echo "myAssocArr['myKey']". I know we can use php complex syntax to get around, like echo "{myAssocArr['myKey']}".

My question is, if php can access normal index arrays without complex syntax, then why can't it access accosiative arrays' values as well. What is happening inside php compiler/zend/whatever engine that prevents it from accessing assosiative arrays' values in a string without the complex syntax.

source https://stackoverflow.com/questions/70137461/why-does-php-need-complexcurly-syntax-to-parse-associative-array-values-in-a-s

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