Simple

$carParts = array(
   'Tires'=>100,
   'Window'=>1042,
   'DoorHandle'=>917
);

Array of Associative Arrays

public $notifyPartners = array(
			array(
				'name' => 'Twitter',
				'tag'  => 'Social Network',
				'url'  => ''),
			array(
				'name' => 'Campaign Monitor',
				'tag'  => 'Email Marketing',
				'url'  => ''),
			array(
				'name' => 'Sendloop',
				'tag'  => 'Email Marketing',
				'url'  => ''),
			array(
				'name' => 'Highrise',
				'tag'  => 'CRM',
				'url'  => '')
);

Looping

foreach ($carParts as $key => $value) {
 echo $key.'=>'.$value.'<br />';
}

while ($element = each($carParts)) {
 echo $element['key'];
 echo ' - ';
 echo $element['value'];
 echo '<br />';
}