在不同的php版本中使用php array_values获取结果

Can anyone explain why the following code works in php5.6, not working in php5.3?

array_values(array)[key]

or give me some keywords ? I've googled for that but cannot find any answers.

That's called Array Dereferencing. Have a look here: http://php.net/manual/en/language.types.array.php#example-102

function getArray() {
    return array(1, 2, 3);
}

// on PHP 5.4
$secondElement = getArray()[1];

// previously
$tmp = getArray();
$secondElement = $tmp[1];