来自foreach循环的无法解释的输出

Question

OK so I posted this question earlier and it remains unanswered. I am grateful for the attempts though.

Foreach loop not outputting arrays as expected

I have tried to narrow this down. I need to know if the array created from a string using explode is in some way different to an array specified by $foo = array(.....). Take this code

   $category_array = array('Pulmonary sarcoidosis', 'Acute critical care', 'Congenital lung disease');

    foreach($category_array as $category){
                $result = Thread_category::find_all_by_category($category);
                foreach ($result as $result_array){
                echo $result_array->thread_id;
                echo "<br/>";
                }
            }

    ?>

Yields:

145 146 149 151

144 148 150 151

145 147 148 149 151

Which is correct. But an array created as follows...

    $category_array = explode(",", $thread->category);

Which is when outputed gives

Array ( [0] => Pulmonary sarcoidosis [1] => Acute critical care [2] => Congenital lung disease )

But when going through the foreach loop gives...

145 146 149 151

It halts as after the first loop......

No idea why and been on this for hours outputting everything.....

I understand there is code in here I haven't explained but I think the problem has to be occuring at the explode level....please help!

Answer 1

Run this and tell us what the echo counts say, please.

$category_array = explode(",","Pulmonary sarcoidosis,Acute critical care,Congenital lung disease");

echo "category_array has ".count($category_array);

foreach($category_array as $category){
            $result = Thread_category::find_all_by_category($category);
            echo "result variable has ".count($result); 
            foreach ($result as $result_array){
            echo $result_array->thread_id;
            echo "<br/>";
            }
        }

?>