[drupal-devel] PHP 101: isset() does not check for
zero length(empty) strings
karoly at negyesi.net
Fri Oct 14 06:51:09 UTC 2005
On Fri, 14 Oct 2005 08:26:08 +0200, Larry Garfield
<larry at garfieldtech.com> wrote:
> +1 on having some recommendations on how to handle these, especially if
> want to make Drupal E_STRICT compliant. (I do, anyway. <g>)
It is well known that these are not the same.
We have already found that is_null is slower but equals to === NULL so use
the latter. In the table referenced above !isset always equals to is_null,
so I propose to use !isset when we want to check for, well, not being set.
if ($foo) and if (isset($foo)) is not the same, often it's a shorthand for
if(isset($foo) && $foo != 0). I think if(isset($foo) && $foo) will always
do. Sometimes isset() can be ommited because we know $foo is set.
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