Re: Re: isset($a->b) even if $a->b = null

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@gmail.com> 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@gmail.com> 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@colin.guthr.ie> 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 -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php

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