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Test of join()

Example #1 : test success
Example #2 : test success
Example #1
$input = [
  0 => ',',
  1 => [
    0 => 'lastname',
    1 => 'email',
    2 => 'phone',
  ],
]
$expected_output = $test_output
$test_output = [
  'result' => [
    'string' => 'lastname,email,phone',
  ],
  'php_version' => '7.1.33 Linux x86_64',
]
Example #2
$input = [
  0 => 'hello',
  1 => [
  ],
]
$expected_output = $test_output
$test_output = [
  'result' => [
    'string' => '',
  ],
  'php_version' => '7.1.33 Linux x86_64',
]
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