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Test of array_change_key_case()

Example #1 : test success
Example #1
$input = [
  0 => [
    'FirSt' => 1,
    'SecOnd' => 4,
  ],
  1 => 'CASE_UPPER',
]
$expected_output = $test_output
$test_output = [
  'result' => [
    'array' => [
      'FIRST' => 1,
      'SECOND' => 4,
    ],
  ],
  'php_version' => '7.1.33 Linux x86_64',
]
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