CODEWITHSUNDEEP
phpurlparameters
Luca Sarif
Luca Sarif

Reputation: 152

Check what parameters are set in a concise way - PHP

I need to get many parameters from a url with different names and check if they are set. (their value doesn't necessarily matter).

https://example.com?one=true&two=true&three=true      etc.

The problem is that in what I want to do, any of them could be set or not.

So I need help of a way to grab which of them are in the url and are set in a clean way, and preferably stored in different variables matching the name of the parameters, instead of having multiple $_GET and isset() lines with if statements all over the place.

EDIT: SUBMIT BEING A PARAMETER WHICH WILL ALWAYS BE IN THE URL: I was thinking this could just be done using a foreach loop.

if (isset($_GET['submit'])) {
  foreach ($_GET as $key => $value) {
  $key = $value;
  echo $key;
 }
}

this will echo out the value of the $key, (which is all i need because then i know it is set), but then i need to get the actual name of what $key is set to.

Thanks

EDIT 2: I have found out how to do this - all i needed was to get the parameters in the url and know the name of them. Sorry if i had worded it wierdly.

if (isset($_GET['submit'])) {
 foreach ($_GET as $key => $value) {
 $$value = $key;
 echo $key;
 }
}

I found out using variable variables is what i needed (hence the 2 $$) This gives me, in the end, $key as the name of whatever parameters are in the url, stored in $value which has the same name.

Upvotes: 1

Views: 104

Answers (3)

Milan Chheda
Milan Chheda

Reputation: 8249

You need to use extract() to extract all keys from an array and treat them as variables

Import variables into the current symbol table from an array

Here is a small example:

$_GET['var_1'] = 1;
$_GET['var_2'] = 2;
$_GET['var_3'] = '';
extract($_GET);
echo $var_1;

Use below code to get empty as well as set keys/values:

$newArray = array_filter($_GET);
$sub_key    = array_keys($newArray);
print_r($sub_key); // this will give you all keys that have values

$sub_values = array_values($newArray);
print_r(array_diff($_GET, $sub_values)); // all keys that have empty values

Upvotes: 1

Rasclatt
Rasclatt

Reputation: 12505

If there is possibility that a key is there or not there, it's helpful to have a class/function that can do a check and return. A framework might work something like this:

    class Request
        {
            public static function getGet($key=false)
                {
                    if(!empty($key))
                        return (isset($_GET[$key]))? $_GET[$key] : false;

                    return $_GET;
                }

            public static function getPost($key=false)
                {
                    if(!empty($key))
                        return (isset($_POST[$key]))? $_POST[$key] : false;

                    return $_POST;
                }
        }

# Would try to retrieve $_GET['one']
$val1 = Request::getGet('one');
# Would try to retrieve $_POST['two']
$val2 = Request::getPost('two');

I wouldn't create dynamic variables, because you still have to check if they are set or whatever. Depending on use and PHP version, you can do:

if(Request::getGet('whatever')) {
    # Do something
}

Upvotes: 0

jfadich
jfadich

Reputation: 6348

You can check if all of the parameters are provided by checking the keys of $_GET

$expected_parameters = ['one', 'two', 'three'];
if(count(array_intersect($expected_parameters, array_keys($_GET))) !== count($expected_parameters)) {
    // Failed validation
}

That will validate that all the required parameters are present, but it doesn't make sure that they're not empty. I would recommend doing further validation to make sure the parameters are of the required type, but in your question you said this isn't a requirement.

To get the parameters into their own variables you can use extract().

extract($_GET)

Upvotes: 0

Related Questions