title: Multidimensional array diff
body: <p>I got 2 arrays:</p>
  
  <pre><code>$big_array = array (
                      array (
                              array (
                                        'correct' =&gt; FALSE,
                                        'answer' =&gt; 'false answer1'
                              ),
                              array (
                                        'correct' =&gt; FALSE,
                                        'answer' =&gt; 'false answer2'
                              ),
                              array (
                                        'correct' =&gt; FALSE,
                                        'answer' =&gt; 'false answer3'
                              ),                  
                              array (
                                        'correct' =&gt; TRUE,
                                        'answer' =&gt; 'correct answer'
                              )
                      )
  );
  
  $small_array = array (
                      array (
                              array (
                                        'correct' =&gt; FALSE,
                                        'answer' =&gt; 'false answer1'
                              )
                      )
  );
  </code></pre>
  
  <p>I want to make <code>array_diff($big_array, $small_array)</code> but its not working how i want it to, currently it gives me an empty array as a result, where i want the outcome to be:</p>
  
  <pre><code>$outcome_array= array (
                      array (
                              array (
                                        'correct' =&gt; FALSE,
                                        'answer' =&gt; 'false answer2'
                              ),
                              array (
                                        'correct' =&gt; FALSE,
                                        'answer' =&gt; 'false answer3'
                              ),                  
                              array (
                                        'correct' =&gt; TRUE,
                                        'answer' =&gt; 'correct answer'
                              )
                      )
  );
  </code></pre>
  
  <p>Any suggestions?</p>