str_contains

<?

$haystack = "haystack needle haystack";
$needle = "needle";

$return = str_contains($haystack, $needle);

var_export($return);

?>

true

<?

$haystack = "haystack";
$needle = "needle";

$return = str_contains($haystack, $needle);

var_export($return);

?>

false

<?

$haystack = "empty needle returns true";
$needle = "";

$return = str_contains($haystack, $needle);

var_export($return);

?>

true

<?

$haystack = "case Case CASE";
$needle1 = "case";
$needle2 = "Case";
$needle3 = "CASE";

$return1 = str_contains($haystack, $needle1);
$return2 = str_contains($haystack, $needle2);
$return3 = str_contains($haystack, $needle3);

var_export($return1);
var_export($return2);
var_export($return3);

?>

truetruetrue