how to check multiple $_POST variable for existence using isset()?

Question

I need to check if $_POST variables exist using single statement isset.

if (isset$_POST[\'name\']  &&  isset$_POST[\'number\']  &&am         


        

Answer 1

$variableToCheck = array('key1', 'key2', 'key3');

foreach($_POST AS $key => $value)
{
   if( in_array($key, $variableToCheck))
  {
     if(isset($_POST[$key])){
     // get value
     }else{
     // set validation error
    }   
  }
}

Answer 2

$variables = array('name', 'number', 'address');

foreach($variables as $variable_name){

   if(isset($_POST[$variable_name])){
      echo 'Variable: '.$variable_name.' is set<br/>';
   }else{
      echo 'Variable: '.$variable_name.' is NOT set<br/>';
   }

}

Or, Iterate through each $_POST key/pair

foreach($_POST as $key => $value){

   if(isset($value)){
      echo 'Variable: '.$key.' is set to '.$value.'<br/>';
   }else{
      echo 'Variable: '.$key.' is NOT set<br/>';
   }

}

The last way is probably your easiest way - if any of your $_POST variables change you don't need to update an array with the new names.

Answer 3

That you are asking is exactly what is in isset page

isset($_POST['name']) && isset($_POST['number']) && isset($_POST['address'])

is the same as:

isset($_POST['name'], $_POST['number'], $_POST['address'])

If you are asking for a better or practical way to assert this considering that you already have all the required keys then you can use something like:

$requiredKeys = ['name', 'number', 'address'];
$notInPost = array_filter($requiredKeys, function ($key) {
    return ! isset($_POST[$key]);
});

Remember, isset does not return the same result as array_key_exists