PHP显示多维数组

I have this array similar to this:

$suppliers = array(
  'Utility Warehouse' => array('Gas' => array(0,0), 'Electricty' => array(0,0)),
  'British Gas' => array('Gas' => array(93,124), 'Electricty' => array(93,124)),
  'Eon' => array('Gas' => array(93,124), 'Electricty' => array(93,124))
);

How can display the information as follows

Utility Warehouse
Gas: 0-0 Electricity 0-0

British Gas
Gas: 93-134 Electricity: 93-134

Eon
Gas: 93-124 Electricity: 93-134

You can see how the displayed data corresponds to the data in the array. I've tried this:

foreach($suppliers as $a){
    echo $a[0];
}

But this does nothing. CONFUSED!

UPDATE Need to say thanks guys, and I apologise for my lack of knowledge. I have never used nested arrays before, and I did search around for a solution before I posted here.

<?php 

foreach($suppliers as $supplier => $category) {
    echo $supplier . '<br />';
    foreach($category as $cat_name => $values_arr) {
        echo $cat_name . ': ' . implode('-', $values_arr) . '<br /><br />';
    }
}

?>

you can try:

foreach($suppliers as $name => $value) {
    echo $name . "<br />";
    foreach($value as $a => $price) {
        echo $a .': '. $price[0].'-'.$price[1];
    }
    echo "<br /><br />";
}

The code to achieve what you want would be following, but i suggest you brush up on your PHP skills a bit more, as this is a trivial task.

foreach($suppliers as $name => $data){
    echo $name . '<br/>';
    foreach($data as $utility => $value){
        echo $utility . ': ' . $value[0] . '-' . $value[1] . ' ';
    }
    echo '<br/><br/>';
}

Same answer as everyone else (I'm too slow). Here's a working example: http://codepad.org/PDPEjAGJ

Also, everyone who answered this question, me included, is guilty of spoonfeeding. Ahh well, the things I'll do for points! :p