Как вывести ассоциативный массив php?

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$array = array("key1" => "value1", "key2" => "value2", "key3" => "value3");

foreach ($array as $key => $value) {
    echo $key . ": " . $value . "<br>";
}

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key1: value1
key2: value2
key3: value3

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$array = array("key1" => "value1", "key2" => "value2", "key3" => "value3");

print_r($array);

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Array ( [key1] => value1 [key2] => value2 [key3] => value3 )

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$array = array("key1" => "value1", "key2" => "value2", "key3" => "value3");

var_dump($array);

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array(3) {
  ["key1"]=>
  string(6) "value1"
  ["key2"]=>
  string(6) "value2"
  ["key3"]=>
  string(6) "value3"
}