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bool is_object ( mixed $var )

<?php
function get_subjects($obj_name)
{
    if(!is_object($obj_name))
    {
        return(false);
    }
    return($obj_name->subjects);
}
$obj_name = new stdClass;
$obj_name->subjects = Array('Google', 'tutorialpro', 'Facebook');
var_dump(get_subjects(NULL));
var_dump(get_subjects($obj_name));
?>

bool(false)
array(3) {
  [0]=>
  string(6) "Google"
  [1]=>
  string(6) "tutorialpro"
  [2]=>
  string(8) "Facebook"
}