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<?php

// $null_or_undefined = 'there!';
$case1 = $null_or_undefined ?? 'nothing!';
echo 'case1: ' . var_export($case1, true) . PHP_EOL;  // case1: 'nothing!'

$definiedVar = 'content';
$case2 = $definiedVar ?? 'nothing!';
echo 'case2: ' . var_export($case2, true) . PHP_EOL;  // case2: 'content'


// $_POST['isThere?'] = 'there!';
$case3 = $_GET['isThere?'] ?? $_POST['isThere?'] ?? 'nothing!' ;
echo 'case3: ' . var_export($case3, true) . PHP_EOL;  // case3: 'nothing!'

// Safe foreach
// $defined = [100, 200, 300, 400];
foreach ($defined ?? [] as $key => $value) {
  echo 'case4: ' . $key . ' => ' . $value . PHP_EOL;  // No printing.
}

// Undefined safe.
class Klass
{
  public $object;
  public function __construct()
  {
    $this->object = new stdClass();
    // $this->object->property = 'exists';  // Be undefined.
  }
}

$Klass = new Klass();
echo $Klass->object->property ?? 'none';  // none.
echo PHP_EOL;

$array = [
  'key' => [
    // 'innerKey' => 'value',  // Be undefined.
  ], 
];

echo $array['key']['innerKey'] ?? 'none';  // none
echo PHP_EOL;