Check if url contains parameters

php, url

Solution

The URL parameters are received from a global variable called `$_GET` which is in fact an array. So, to know if a URL contains a parameter, you can use `isset()` function.

if (isset($_GET['yourparametername'])) {
    //The parameter you need is present
}

Afterwards, you can create separate array of such parameter you need to attach to a URL. Like:

if(isset($_GET['param1'])) {
    \\The parameter you need is present
    $attachList['param1'] = $_GET['param1'];
}
if(isset($_GET['param2'])) {
    $attachList['param2'] = $_GET['param2];
}

Now, to know whether or not, you need a `?` symbol, just count this array

if(count($attachList)) {
    $link .= "?";
    // and so on
}

Update:

To know if any parameter is set, just count the `$_GET`

if(count($_GET)) {
     //some parameters are set
}

Problem

Possible Duplicate: keeping url parameters during pagination I want to add a parameter to the current url with php, but how do I know if the url already contains a parameter? Example: foobar.com/foo/bar/index.php => foobar.com/foo/bar/index.php?myparameter=5 foobar.com/index.php?foo=7 => foobar.com/index.php?foo=7&myparameter=5 The main problem is that I don't know if I need to add a "?". My code (found it somewhere, but it doesn't work): ``` <?php if(/?/.test(self.location.href)){ //if url contains ? $url = "http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]&myparameter=5"; } else { $url = "http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]?myparameter=5"; }?> ```

Original source

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