Cc: php-gene@lists.php.net
Subject: Re: [PHP] Passing an array as a hidden variable

On Fri, May 11, 2007 11:53 pm, Todd Cary wrote:
> When I use the following syntax, the 2 dimensional array loses it's
> contents.  Can an array be passed this way?

>    <? echo '<input type="hidden" name="attend_ary_save" value=' .
> $attend_ary_save .'>'; ?>

No.

You'll just get "Array" back.

You can do a few things:

<?php
  foreach($attend_ary_save as $k1 => $v1){
    foreach($v1 as $k2 => $v2){
      ?><input type="hidden" name="attend_ary_save[<?php echo $k1?>][<?php
echo $k2?>]" value="<?php echo $v2?>" /><?php
    }
  }
?>
Actually, you should wrap htmlentities() around each value being echo-ed
out.

Another option is to http://php.net/serialize the data before you send it to
HTML, and then (duh) unserialize it when it comes back.

Or, be REALLY smart, and use session_start() and just put the array in
$_SESSION and don't send data back-n-forth over HTTP, which is A) expensive,
and B) subject to user tampering, and C) inefficient.

Actually, A and C technically depend on your bandwidth versus hard drive
speed, or wherever you store you session data, so, in theory, it could be
cheaper or more efficient to use HTTP...  But I sure doubt it in any real
world hardware setup.

PS Just FYI, internally, PHP's session data is just serialized the same way
you'd do it for HTTP.

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