note 86919 deleted from function.isset by cmb
| From: | cmb@php.net | Date: | Sun, 10 Feb 2019 11:25:29 +0000 |
| Subject: | note 86919 deleted from function.isset by cmb | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-210215@lists.php.net to get a copy of this message | ||
Note Submitter: jwvdveer at gmail dot com
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Here a short note on the function tomek wrote:
Don't use it, because it is still better to use !$var than !is($var).
Some comments on the body of the function:
<?php
function is($var)
{
if (!isset($var)) return false; # Variable is always set... Otherwise PHP would have thrown an error
on call.
if ($var!==false) return true; # So, 0, NULL, and some other values may not behave like isNot? And
what about the difference between a class and NULL?
return false;
}
?>
The reason why you shall not use this function:
Notice: Undefined variable: {variablename} in {file} on line {__LINE__}
It's me as plain as the nose on your face that the piece of code hasn't been tested with
E_NOTICE.
So my advice in this case is: don't use the above function, but simply use !, and functions
such like is_null in the situation they are made for.