Java software engineer learning php-8. magic extract ()

Java programmers learn php-8. the Magic extract () declares an associated array: & nbsp; $ map [BJ] Beijing; & nbsp; $ map [SH] Shanghai; then perform extract ($ map ), you can automatically obtain the $ BJ and $ SH variables, whose values are Beijing and Shanghi. That is, java programmers learn php-8. the magic extract ()
Declare an associated array:
$ Map ['BJ '] = 'Beijing ';
$ Map ['sh'] = 'Shanghai ';

Then perform the extract ($ map) operation to automatically obtain the $ BJ and $ SH variables. Their values are Beijing and Shanghi.

That is to say, extract is programmed for you. This is hard to imagine in Java.