WordPress Development Question:

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Can you please explain the difference between accessing a class method via -> and via ::

WordPress Expert Interview Question
WordPress Expert Interview Question

Answer:

:: is allowed to access methods that can perform static operations, i.e. those, which do not require object initialization.

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How come code
<?php print "Contents: $arr[1]"; ?>
works, but
<?php print "Contents: $arr[1][2]"; ?>
doesn't for two-dimensional array of mine?		If the variable $a is equal to 5 and variable $b is equal to character a, what's the value of $$b?