note 53926 modified in types.comparisons by philip
| From: | philip@php.net | Date: | Wed, 14 Dec 2005 02:42:00 +0000 |
| Subject: | note 53926 modified in types.comparisons by philip | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-100103@lists.php.net to get a copy of this message | ||
<?php
if (strlen($_POST['var']) > 0) {
// form value is ok
}
?>
When working with HTML forms this a good way to:
(A) let "0" post values through like select or radio values that correspond to array keys
or checkbox booleans that would return FALSE with empty(), and;
(B) screen out $x = "" values, that would return TRUE with isset()!
Because HTML forms post values as strings, this is a good way to test variables!
[[Editor Note: This will create a PHP Error of level E_NOTICE if the checked variable (in this case
$_POST['var']) is undefined. It may be used after (in conjuection with) isset() to prevent
this.]]
--was--
<?php
if (strlen($_POST['var']) > 0)
{
// form value is ok
}
?>
When working with HTML forms this a good way to:
(A) let "0" post values through like select or radio values that correspond to array keys
or checkbox booleans that would return FALSE with empty(), and;
(B) screen out $x = "" values, that would return TRUE with isset()!
Because HTML forms post values as strings, this is a good way to test variables!
http://php.net/manual/en/types.comparisons.php