使用“array_search”时没有获得第一个值

Question

Here, I have two multi-dimensional array. As I want to find the value from first array if the value is there in second array or not.

First array:

$abc = array(
    array("fld_channel_selected_item_track_id" => 627905217),
    array("fld_channel_selected_item_track_id" => 616557954)
);

Second array:

$pqr = array(
    array(
        "fld_channel_item_track" => 627905217,
        "fld_channel_item_title" => "Tropical Fantasy"
    ),
    array(
        "fld_channel_item_track" => 616557954,
        "fld_channel_item_title" => "Bday Boys"
    )
);

So, I am searching if the first array value is there in second array value or not:

for($i = 0;$i < count($abc); $i++)
{   
    $pos = array_search($abc[$i]["fld_channel_selected_item_track_id"], array_column($pqr, 'fld_channel_item_track'));
    if($pos) 
    {   
        echo "<pre>";print_r($pqr[$pos]);
    }
}
exit;

The outout is:

<pre>Array
(
    [fld_channel_item_track] => 616557954
    [fld_channel_item_title] => Bday Boys
)

Here, I am not getting the first value in my output.

Where I am wrong in that?

Answer 1

The problem is array_search (doc) return index -> in your case index 0 so if ($pos) fails...

Returns the key for needle if it is found in the array, FALSE otherwise.

Need to compare result to FALSE

By the way, this will be better way t achieve what you need:

$a = array_column($abc, 'fld_channel_selected_item_track_id');
$b = array_column($pqr, "fld_channel_item_title", "fld_channel_item_track");
foreach($a as $searchId)
    if (isset($b[$searchId])) echo $b[$searchId] . PHP_EOL;