How to comparing the data in php using IF ELSE

Use in_array() to check if an item is in an array.

$ingredients = array('First ingredient', 'Second ingredient');

If the ingredients are a string separated by a comma you can convert them to an array using:

$ingredients = explode(',',$ingredients);

You may want to trim each item to ensure any whitespace around each item is removed (which will mess up your in_array() check:

$ingredientsTrimmed = array();

foreach($ingredients as $ingredient)
{
    $ingredientsTrimmed[] = trim($ingredient);
}

$ingredients = $ingredientsTrimmed;

Finally, you can do your checks:

if(in_array('First ingredient',$ingredients))
{
    // First ingredient is in the array
}

To check if an array contains both:

if(in_array('First ingredient',$ingredients) AND in_array('Second ingredient',$ingredients))
{
    // First and second ingredient is in the array
}

To check if it contains either one or the other:

if(in_array('First ingredient',$ingredients) || in_array('Second ingredient',$ingredients))
{
    // First or second ingredient is in the array
}

You can add as many 'AND's and '||'s as you need. See more about PHP's logical operators

If your ingredients are in string:

if ( strpos($ingredients, "emulsifier") === false
  && strpos($ingredients, "shortening") === false ) {
   echo 'Best Product';
} elseif ( strpos($ingredients, "emulsifier") !== false
  && strpos($ingredients, "shortening") !== false ) {
   echo 'Good Product';
}