ID: 13874
Updated by: sander
Reported By: [EMAIL PROTECTED]
Old Status: Open
Status: Bogus
Bug Type: Unknown/Other Function
Operating System: ALL
PHP Version: 4.0.6
New Comment:
Not a bug. Intended behaviour. isset() returns false on variables with a NULL value.
Documentation is being worked on.
Previous Comments:
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[2001-10-30 11:23:43] [EMAIL PROTECTED]
There's no good way to check weather a key exists in an associative array.
The problem is that if the key exists, but the value is null, is treated the
same as if the key doesn't exist.
The only way I figure is to check: in_array("key", array_keys($array))
but this seams rather expensive.
(Compare: perl has an "exists" function ...)
Sample:
$sample = array("a" => "a", "b" => NULL);
print ":".isset($sample['a'])."<br>\n";
print ":".isset($sample['b'])."<br>\n";
print ":".isset($sample['c'])."<br>\n";
print ":".in_array("a", array_keys($sample))."<br>\n";
print ":".in_array("b", array_keys($sample))."<br>\n";
print ":".in_array("c", array_keys($sample))."<br>\n";
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Edit this bug report at http://bugs.php.net/?id=13874&edit=1
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