check in string is part oof other string php

$result = strpos("haystack", "needle");

if ($result != false)
{
  // text found
}$mystring = 'abc';
$findme   = 'a';
$pos = strpos($mystring, $findme);$a = 'How are you?';

if (strpos($a, 'are') !== false) {
    echo 'true';
}