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Php set variable to null


php set variable to null

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)?
Var was not set var?True : false; * isset_gt0 * * As above, but returns true only if var is set and it's length is 0 function isset_gt0( x) if (isset(x) strlen(x) 0) return true; else return false; purpleidea fyi: you *cannot* do assignments inside of the isset function.If the value is empty, the consumer (whether a view or another client like javascript) should be allowed to make this choice on it's own.Another option is to do: name (name 'joe Well, in PHP, that doesn't work.Or, perhaps, it's based on the memory usage, if it is how about x"?But this is dirty since you cannot make sure these variables exist and php will echo a warning if you refer to a non-existing variable like this.and?PHP foo new Foo; echo isset(foo- bar?Outputs: True False The problem is, modern warfare 2 patch ps3 prestige 11 the set_error_handler and restore_error_handler calls can not be inside the function, which means you need 2 extra lines of code every time you are testing.Codeslinger according to the docs - "isset will return false if testing a variable that has been set to null." That statment is not always correct, sometimes isset returns true for a null value.Instead always use null, false, and true when comparing.
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.


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