将数组设置为PHP中的会话变量，然后访问它

Question

If I have an array:

$resultArr = pg_fetch_array($result,NULL );

and at the top of my php code I declare:

$_SESSION['resultArr'] = $resultArr;

Why can't I access the array elements like so:

for($i = 0; $i < $NUM_COLUMNS; $i++){
    // creation of the table and row are handled elsewhere.
    // The table is also within a <form> if that matters
    echo "<td>" .$_SESSION['resultArr'][$i]."</td>";
}

My table ends up having empty columns and I can't figure out why...

EDIT: I figured it out. I was declaring $_SESSION['resultArr'] = $resultArr; at the top of my code (right after session_start()) and it wasn't getting set. I moved it down to the point right after $resultArr = pg_fetch_array($result,NULL);

Is this how it's supposed to work or should it have worked fine at the top of the code?

Answer 1

也许您提到了，但没有提及，但是您必须在$_SESSION上的任何操作之前调用session_start()

Answer 2

after your edit, yes this is how it is supposed to work, you first need to declare $resultArr , then put it's value in the session array

beacause in php you are no longer working with pointers, $_SESSION['resultArr'] = $resultArr; mean "$_SESSION['resultArr'] takes all the values of $resultArr at that precise moment", but it does not mean "they are thesame, if one changes, then the other changes too" .