Case-insensitive partial keyword search on 2d array

I have multi dimension arrays in which I want to look for some particular words this is how my array looks like

Array
(
    [0] => Array
        (
            [sch_name] => Montfort School Roorkee
            [sch_degree] => High School
            [sch_field] => Commerce
            [sch_grade] => A+
            [sch_from_year] => 2007
            [sch_to_year] => 2015
            [sch_desc] => Montfort School was very nice
        )

    [1] => Array
        (
            [sch_name] => City Public
            [sch_degree] => 12
            [sch_field] => Commerce
            [sch_grade] => 12
            [sch_from_year] => 2007
            [sch_to_year] => 2015
            [sch_desc] => Great School
        )

)

Now suppose i want to find 'montfort' word in this multi dimensional array

So i tried using this function

function searchForWord($id, $array) {
   foreach ($array as $key => $val) {
       if ($val['sch_name'] === $id) {
           return $key;
       }
   }
   return null;
}
echo $id = searchForWord('montfort', $p);

it resulted in nothing but when I wrote 'Montfort School Roorkee' result was found, why these word are so sensitive is there any other way to get values

Can't I use something like we do in a MySQL query LIKE '%keyword'?

Try this:

$cols = array_column($your_array,'sch_name');
$keys = [];
foreach ($cols as $k=>$v) {
    if (strpos(strtolower($cols[$k]),strtolower('Mont'))!==false) {
        $keys[]=$k;               
    }
}
print_r($keys);

replace $your_array with your array.

it's case insensitive and will match anything partial. You could make it a function like so:

function SearchArrayForKeys($array,$column_name,$search) {
    if (!$array||!is_array($array)) {
        return [];
    }
    $cols = array_column($array,$column_name);
    if (!$cols){
        return [];
    }
    $keys = [];
    foreach ($cols as $k=>$v) {
        if (strpos(strtolower($cols[$k]),strtolower($search))!==false) {
            $keys[]=$k;               
        }
    }        
    return $keys;
}

usage:

$keys = SearchArrayForKeys($your_array,'sch_name','Mont');