引用数组中的索引元素 - PHP

Here is the vardump for my array:

array(4) {
         [3]=> array(1) 
         {
             ["match"]=> int(33) 
         } 
         [2]=> array(1) 
         { 
             ["match"]=> int(32) 
         } 
         [1]=> array(1) 
         { 
             ["match"]=> int(16) 
         } 
         [4]=> array(1) 
         { 
             ["match"]=> int(3) 
         } 
}

I need to return the indexes 3, 2, 1, and 4 for use in a query. I have no idea how to do this. I need to run the query in a foreach statement:

foreach($arrayName as $key){
    //NEED TO RETURN INDEX HERE    
}

I've tried to use key($key) but that returned the word "match" which is the index of one level below where I need.

Any help will be appreciated.

Easy one ;)

$keys = array_keys($arrayName);

foreach($arrayName as $key => $value){
    echo($key);    
}

Just add the key to the foreach:

foreach($arrayName as $key => $value){
       echo $key; //$key is well... the key and $value is the value of the current element in the array :)
}

foreach($arrayName as $key)

The $key is actually the value in the array. Try:

foreach($arrayName as $key=>$value)