Re: ifsetor like expression in php6

Hi, usage of references here have some bad consequences, it will pollute the input array with null entries: function foo(&$a) { } var_dump(array_key_exists('inexistent', $_GET)); // bool(false) foo($_GET['inexistent']); var_dump(array_key_exists('inexistent', $_GET)); // bool(true) will actually create the inexistent entry and fill it with null. Again, there is no perfect implementation of an issetor in userland. On Jan 26, 2008 6:22 PM, Sam Barrow <sam@sambarrow.com> wrote: > I'm sorry I misunderstood. If specifying like "$var ?: 5" then it should > throw an E_NOTICE, as this is a conditional that checks the value of a > variable ($var). > > Sebastian, for assigning of a default value is a variable is not set, I > would recommend using something like this (this is what I use): > > function ifsetor(&$var, $or) { > return isset($var) ? $var : $or ; > } > > Because $var is passed by reference, it won't throw an E_NOTICE when > passing an undeclared variable. > > On Sat, 2008-01-26 at 17:30 +0100, Sebastian wrote: > > > hi, > > > > i just found the new ifsetor like construction in php6. It left me the > > question why php has to throw an E_NOTICE when the variable is not set. This > > is basicly because that actually is the meaning of this construction, > > checking if the variable is set and if it isnt give back a standard value. > > Of course i know this construction can be (mis)used with an Boolean check > > ($var===$var2), but this does not make much sence either because TRUE will > > then be assigned to the new variable if the expression evaluates to TRUE > > (but please correct me if theres a real use for this). > > > > So in any case it would be better to remove the Boolean check feature and > > make it a simple ifsetor() without the E_NOTICE again. > > > > For those of you who have not heard of it heres an example: > > > > <?php > > > > // If $_GET['foo'] is set, then its value will be assigned to $foo, > > // otherwise 42 will be assigned to $foo. > > > > $foo = $_GET['foo'] ?: 42; > > > > ?> > > > > Greetings > > > > Sebastian > > > > -- > PHP Internals - PHP Runtime Development Mailing List > To unsubscribe, visit: http://www.php.net/unsub.php > > > -- Etienne Kneuss http://www.colder.ch Men never do evil so completely and cheerfully as when they do it from a religious conviction. -- Pascal