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<!DOCTYPE html> <html> <body> <?php $a = 1; echo "a is " . is_bool($a) . "<br>"; $b = 0; echo "b is " . is_bool($b) . "<br>"; $c = true; echo "c is " . is_bool($c) . "<br>"; $d = false; echo "d is " . is_bool($d) . "<br>"; ?> </body> </html>
a is
b is
c is 1
d is 1
