php check if string contains letter at specific code example

Example 1: php check if string contains word

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

Example 2: php find if substring is in string

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

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