Fucking PHP type system.

booleans

± phpsh
Starting php
type 'h' or 'help' to see instructions & features
php> $a = [1, 4, 3, true, false, 6, 0, 19]

php> =$a
array(
  0 => 1,
  1 => 4,
  2 => 3,
  3 => true,
  4 => false,
  5 => 6,
  6 => 0,
  7 => 19,
)
php> sort($a)

php> =$a
array(
  0 => 0,
  1 => false,
  2 => 6,
  3 => 19,
  4 => true,
  5 => 1,
  6 => 3,
  7 => 4,
)
php> sort($a)

php> =$a
array(
  0 => 0,
  1 => false,
  2 => 1,
  3 => 3,
  4 => 4,
  5 => 6,
  6 => 19,
  7 => true,
)

nulls

± phpsh
Starting php
type 'h' or 'help' to see instructions & features
php> $a = [1, 4, 3, 5, 10, 8, null, null, -1, -5]

php> =$a
array(
  0 => 1,
  1 => 4,
  2 => 3,
  3 => 5,
  4 => 10,
  5 => 8,
  6 => null,
  7 => null,
  8 => -1,
  9 => -5,
)
php> sort($a)

php> =$a
array(
  0 => null,
  1 => null,
  2 => -5,
  3 => -1,
  4 => 1,
  5 => 3,
  6 => 4,
  7 => 5,
  8 => 8,
  9 => 10,
)
php> usort($a, function($e1, $e2) { return $e1 - $e2; })

php> =$a
array(
  0 => -5,
  1 => -1,
  2 => null,
  3 => null,
  4 => 1,
  5 => 3,
  6 => 4,
  7 => 5,
  8 => 8,
  9 => 10,
)