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<?php $pri = array(); $pri['+'] = 0; $pri['-'] = 1; $pri['*'] = 2; $pri['/'] = 3; $pri['^'] = 4; var_dump(array_keys($pri)); ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(5) { [0]=> string(1) "+" [1]=> string(1) "-" [2]=> string(1) "*" [3]=> string(1) "/" [4]=> string(1) "^" }