Maybe if you tell us exactly what you wish to achieve.
Class variables that are not created at object creation is bad design.
Olav Mørkrid schreef:
yes, but that assumes you have a defined class. if $a comes from
mysql_fetch_object() for instance you have just a stdobject, and this
method will produce an error.
On 17/08/07, Michael Preslar <mpreslar@xxxxxxxxx> wrote:
Found something.
For class variables..
http://us.php.net/manual/en/function.property-exists.php
class a {
var $b;
}
if (property_exists('a','b')) {
print "yes\n";
}
On 8/17/07, Olav Mørkrid <olav.morkrid@xxxxxxxxx> wrote:
the test i need should give the following results:
- FALSE when $a->b does not exist at all
- TRUE when $a->b = null
- TRUE when $a->b = <any value>
empty() gives true for both $a->b = null and not setting any value, so
that's no good.
borokovs suggestion seems to miss the purpose.
anyone else?
On 17/08/07, Colin Guthrie <gmane@xxxxxxxxxxxxxx> wrote:
Olav Mørkrid wrote:
how do i test if a property of a stdclass object is set, even if its
value is null, similar to how array_key_exists() works for arrays.
the following method fails:
$a->b = null;
if(isset($a->b))
echo "yes";
and property_exists() seems only to work for defined objects.
hope someone can help. thanks!
You can try:
unset($a-b)
Or change isset() to empty().
empty() catches more than isset() e.g. '' (empty string), false, 0 etc.
are considered "empty". Depending on your logic it can still be very
useful. It is a language construct rather than a function so it's also
efficient.
Col
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