The problem of two-dimensional array comparison?

$data = [
    ["foo" => "bar", "x" => "foo"],
    ["foo" => "bar1", "x" => "foo1"],
    ["foo" => "bar", "x" => "foo2"]
];

I need to delete the duplicate array of foo in this array, leaving only one item. How do you do that? 

$data = [
    ["foo" => "bar", "x" => "foo"],
    ["foo" => "bar1", "x" => "foo1"],
];
Php
Mar.09,2021 
        $tmp  = [];
        foreach ($data as $key => $datum) {
            if (in_array($datum['foo'], $tmp)) {
                unset($data[$key]);
                continue;
            }
            $tmp[] = $datum['foo'];
        }
//$arr = array_merge($data1,$data2);
//
  $key = 'foo';//
  $tmp_arr = array();//
  //var_dump($data);
 foreach($data as $k => $v)
 {
  if(in_array($v[$key], $tmp_arr))
//$v[$key]$tmp_arrtrue
  {
   unset($data[$k]);
   //$arrID
  }
 else {
   $tmp_arr[] = $v[$key];
   //id
  }
 }
var_dump($data);

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