Online PHP editor | output for 46MgJ

<?php function genRand($length = 10, $chars = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ') { $randomString = ''; for ($i = 0; $i < $length; $i++) { $randomString .= $chars[rand(0, strlen($chars) - 1)]; } return $randomString; } function populate($count = 10000) { $array = array(); for($i = 0; $i < $count; $i++) { $phone = genRand(5,'0123456789'); $array[$phone] = array( 'phone' => $phone, 'name' => genRand(20), 'age' => genRand(2, '0123456789'), ); } return $array; } $array1 = populate(40000); $array2 = populate(40000); $match = FALSE; foreach($array1 as $key => $value) { if(array_key_exists($key, $array2)) { $match = TRUE; break; } } print_r(($match ? 'matched' : 'nope'));