比较两个数组以找到公共元素，然后在第一个数组中找到那些公共元素的索引

I have two arrays in php named as company_timings and in_time, respectively.

I have found the common elements in both the arrays and stored those common elements in common array.

Now I want to find the indexes of these common elements in the first array, i.e in company_timing.

Below is my code:

$length_of_company=sizeof($company_timings);
$length_of_emp=sizeof($in_time);
for ($i=0; $i <=$length_of_company-1; $i++) { 
    # code...
    for ($j=0; $j<=$length_of_emp-1; $j++) { 
        # code...
        if ($in_time[$j]==$company_timings[$i]) {
            # code...
            $common[]=$company_timings[$i];
    }
}
}

All the three arrays look like these

$company_timings=array('09:00:00','10:00:00'.'11:00:00','12:00:00');
$in_time=array('09:00:00','11:00:00');
$common=array('09:00:00','11:00:00');

Now I tried passing $common in array_search func to find the indexes of 09:00:00 and 11:00:00 respectively in $company_timings

    $indexes=array_search($common,$company_timings);

but I didn't get anything but when I used

   $indexes=array_search("11:00:00",$company_timings); 

I got the desired outcome which is 12...

Can you guys tell me how should I achieve that?