Grader Celsius:

foreach() loop:
-20 -10 0 10 20 30 40 50 60 70 80 90 100
var_dump():
array(13) { [0]=> int(-20) [1]=> int(-10) [2]=> int(0) [3]=> int(10) [4]=> int(20) [5]=> int(30) [6]=> int(40) [7]=> int(50) [8]=> int(60) [9]=> int(70) [10]=> int(80) [11]=> int(90) [12]=> int(100) }

print_r():
Array ( [0] => -20 [1] => -10 [2] => 0 [3] => 10 [4] => 20 [5] => 30 [6] => 40 [7] => 50 [8] => 60 [9] => 70 [10] => 80 [11] => 90 [12] => 100 )

Grader Fahrenheit:

foreach() loop:
-4 14 32 50 68 86 104 122 140 158 176 194 212
var_dump():
array(13) { [0]=> float(-4) [1]=> float(14) [2]=> float(32) [3]=> float(50) [4]=> float(68) [5]=> float(86) [6]=> float(104) [7]=> float(122) [8]=> float(140) [9]=> float(158) [10]=> float(176) [11]=> float(194) [12]=> float(212) }
print_r():
Array ( [0] => -4 [1] => 14 [2] => 32 [3] => 50 [4] => 68 [5] => 86 [6] => 104 [7] => 122 [8] => 140 [9] => 158 [10] => 176 [11] => 194 [12] => 212 )