check if char is on the same position as string php code example

Example 1: php check if string contains a char

$haystack = 'This is my haystack that we shall check'
$has_A = strpos($haystack, 'A') !== false;
$has_a = strpos($haystack, 'a') !== false;

Example 2: strpos

$mystr = 'abc';
$findMe   = 'a';
$position = strpos($mystr, $findMe);