Php check if string contains a char

Php check if string contains word

$myString = 'Hello Bob how are you?';
if (strpos($myString, 'Bob') !== false) {
    echo "My string contains Bob";
}

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

if ($result != false)
{
  // text found
}

if (strpos($haystack,$needle) !== false) {
    echo "$haystack contains $needle";
}

// returns true if $needle is a substring of $haystack
function contains($haystack, $needle){
    return strpos($haystack, $needle) !== false;
}

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

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