array_isset_key.func.php

<?php

/**
 * Function to check for more than one 
 * array keys of a long/nested associative array. 
 * 
 * i.e, instead of doing this $var['key1']['key2'] (which will result in undefined 
 * notice if the key/index does not exist) you can do this isset_key($var, 'key1', 'key2')
 * 
 * @param  array  $var  Array variable
 * @param  string $keys key(s) to check
 * @return boolean|string|array
 */
function isset_key($var, ...$keys) {

  foreach ($keys as $key) {

    if ( is_array($var) && isset($var[$key]) ) {

      $var = $var[$key];

    } else {

      $var = false;
      break;

    }

  }

  return $var;

}