Php - Output all keys and unique values from an array

Create an empty array to hold the end result and use a simple foreach loop like this;

$names  = array("Accounting"=>"Peter", "Finance"=>"Joe", "Human Resource"=>"Joe");

$resultArr = array();
foreach($names as $key => $value){
    $resultArr[$value][] = $key;
}

// display $resultArr array
var_dump($resultArr);

Here's a live demo

Iterate through the keys and values in the array using a foreach loop and print both the keys and values.

foreach($names as $key => $value) {
 print "$key : $value\n";

}