Can I Display All the Cookies I Set in Php?

foreach ($_COOKIE as $key=>$val)
  {
    echo $key.' is '.$val."<br>\n";
  }

<pre><?php print_r( $_COOKIE ); ?></pre> will do what you want. You might also try phpinfo().

echo $_COOKIE["cookie_name"]; // Print an individual cookie

print_r($_COOKIE); // Another way to debug/test is to view all cookies

You can display all cookies defined by running the following php function:

var_dump($_COOKIE);

if($_COOKIE) {
  print_r($_COOKIE);     //print all cookie
}
else
{
   echo "COOKIE is not set";    
}

As with any inputs, security practices should include filtering and validation. Since all cookies are strings, sanitize the strings:

var_dump(filter_input_array(INPUT_COOKIE, FILTER_SANITIZE_STRING, FILTER_REQUIRE_ARRAY))

PHP Docs:

if($_COOKIE) {
   foreach ($_COOKIE as $key=>$val)
   {
       echo $key.' is '.$val."<br>\n";
   }
}
else
{
    echo "No Cookies are Set";    
}

This will check if any cookies are set, if found will iterate through each and print out the cookie name and value