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Maybe I didn't understand your question correctly, but if you need to change another alphabetical phone to alphanumeric mode 2(A,B,C) 3(D, E) ,F) 4(G,H,I) 5(J,K,L) 6(M,N,0) 7(P,Q,R,S) 8(T,U,V) 9(W ,X) ,Y,Z)You can try this:

$another_phone = 'holidays1';
$alias_array = array(
    '0' => ['0'],
    '1' => ['1'],
    '2' => ['A','B','C'],
    '3' => ['D','E','F'],
    '4' => ['G','H','I'],
    '5' => ['J','K','L'],
    '6' => ['M','N','O'],
    '7' => ['P','Q','R','S'],
    '8' => ['T','U','V'],
    '9' => ['W','X','Y','Z']);
    
$phone_in_letters = strtoupper($another_phone);
//creating an array
$phone_in_letters_array = str_split($phone_in_letters );

$phone_array = [];
foreach($phone_in_letters_array as $val) {
    foreach ($alias_array as $key => $letters) {
        if (in_array($val, $letters)) {
            $phone_array[] = $key;
        }
    }
}

print_r(implode($phone_array));