How to search in PHP Array, similar to MySQL Like %var% search

preg_grep_keys_values.php

<?php

// Example from https://stackoverflow.com/questions/36081298/how-to-search-in-php-array-similar-to-mysql-like-var-search?rq=1

function preg_grep_keys_values($pattern, $input, $flags = 0) {
    return array_merge(array_intersect_key($input, array_flip(preg_grep($pattern, array_keys($input), $flags))), preg_grep($pattern, $input, $flags));
}

$a = array(
  'mark@test.by.com'=> "Mark Mian lv",
  'jhon@test.lv.com'=> "John jack lv",
  'logon@test.en.com'=> "Bob Logon",
  'Stela@test.es.com'=> "Stela Josh",
  'json@test.es.com'=> "Json Josh",
  'bobby@test.lv.com'=> "Bob Mark"
);
 
$r = preg_grep_keys_values('~lv~i', $a);
print_r($r);
/*
Array
(
    [jhon@test.lv.com] => John jack lv
    [bobby@test.lv.com] => Bob Mark
    [mark@test.by.com] => Mark Mian lv
)
*/

// Demo: https://ideone.com/WO1r4m