You can take reference form below example to find the value in an array list using php in_array.

Suppose you have a list of Favorite List items (for example a list of colors names) and you want search your color is exist in list or not exist.

                <?php
                    $GetColors = array("Green", "Red", "Blue", "Yellow","Pink");
                    /*$GetColors is a userdefine variable in which store all colors name.*/

                    /*Now suppose you want search blue colors in array list.*/

                    //put this query
                    if (in_array("Blue", $GetColors))
                      {
                      echo "success colors Found";
                      }
                    else
                      {
                      echo "fail colors Not Found";
                      }
                ?>

If Blue color exist in given array list then result will come "success colors Found";