How to get unique value in multidimensional array

try this

foreach($arr as $key => $val) {
    $new_arr[] = $val['pid'];
}
$uniq_arr = array_unique($new_arr);

Seems pretty simple: extract all pid values into their own array, run it through array_unique:

$uniquePids = array_unique(array_map(function ($i) { return $i['pid']; }, $holder));

The same thing in longhand:

$pids = array();
foreach ($holder as $h) {
    $pids[] = $h['pid'];
}
$uniquePids = array_unique($pids);

In php >= 5.5 you can use array_column:

array_unique(array_column($holder, 'pid'));

Just iterate over it and apply an array_unique on the result:

foreach($holder as $yourValues){
    $pids[] = $yourValues['pid'];
}
$yourUniquePids = array_unique($pids);

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