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Feel free to improve on this anyone ;D andrew penry The following is an example of how to test if a variable is set, whether or not it is null.
PHP : Function Reference : Variable Handling Functions : isset, determine whether a variable is set.
Returns true if variable (or array member) is set and equaL to the first parameter function isset_equals(val, w, xnull, ynull, znull) if (is_array(w) if (array_key_exists(x, w) if (is_array(wx) if (array_key_exists(y, wx) if (is_array(wxy) if(array_key_exists(z, wxy) return (wxyz val)?
It makes use of the fact that an unset variable will throw an E_notice error, but one initialized as null will not.?php function var_exists(var) if return true; else return false; function var_existsHandler(errno, errstr, errfile, errline) globals'var_exists_err' true; l null; E_notice echo (var_exists(l)?
_GET'street' : After: - it's easier to read /ask, if is set parameter array number 'age 'street foreach(parameter as name) name isset GETname)?
14-sep-2005 11:41 I don't know if you guys can use this but i find this piece of code pretty useful (for readabillity at least function isset_else( v, r ) if( isset( v ) return v; else return r; This way you can go: a 4;.And when you are dealing with arrays what you probably want to use instead of isset is array_key_exists These days, I almost never use isset and I write a lot of code.With this simple function you can check if an array has some keys:?php function isset_array if (func_num_args 2) return true; args func_get_args array array_shift(args if (!is_array(array) return false; foreach (args as n) if (!isset(arrayn) return false; return true;?redefining local namespace constants will work 'I am not null!Foo0) for it to return the indexed character. There are a tons of bugs on this subject, all marked as bogus.Heres a quick solution, perhaps there are better ways of going about this, but heres my solution.This also works very nice for setting variable as well,.g.:?php var (isset(var) var)?Plus, a string containing "0" will evaluate to false if casted to a boolean.
Parameters var, the variable to be checked.