这是什么类型的数组以及如何显示此数组

How to display this using php and what type of array is this please explain

Array
(
    [name] => Ajin
    [username] => ajin
    [password] => password
)

It's an associative array. This is how you can define it:

$array = array('name' => 'Ajin', 'username' => 'ajin', 'password' => 'password');

And you can get that output with print_r():

print_r($array);

It outputs:

Array
(
    [name] => Ajin
    [username] => ajin
    [password] => password
)

You can read more about array in the manual. You can for example iterate through the array using foreach to display it:

foreach ($array as $key => $value) {
  echo $key . ': ' . $value . PHP_EOL;
}

This outputs:

name: Ajin
username: ajin
password: password

Or you can access individual values as $array['name']:

echo $array['name'];

It's an associative array.

Associative arrays - Arrays with named keys. You can define as

$array = array(
'name' => 'Ajin',
'username' => 'ajin',
'password' => 'password'
);

And we can show the output like

print_r($array);

or you can use it as -

foreach ($array as $key => $index) {
echo " key $key => $index";
}