How can “[” be an operator in the PHP language specification?

Question

On the http://php.net/manual/en/language.operators.precedence.php webpage, the second highest precedence level contains a left-associative operator called [.

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Answer 1

It just means the array variable (left associativity - $first) will be evaluated before the array key (right associativity - $second)

$first[$second]

This have lot of sense when array has multiple dimensions

$first[$second][$third][$fourth]