Helper function that returns the value for a key in an array or a property in an object. No more endless isset() statements.

get_key.php

<?php
/**
 * Return the value for a key in an array or a property in an object.
 * Typical usage:
 * 
 * $object->foo = 'Bar';
 * echo get_key($object, 'foo');
 * 
 * $array['baz'] = 'Bat';
 * echo get_key($array, 'baz');
 * 
 * @param mixed $haystack
 * @param string $needle
 * @param mixed $default_value The value if key could not be found.
 * @return mixed
 */
function get_key ($haystack, $needle, $default_value = '')
{
	if (is_array($haystack)) {
		// We have an array. Find the key.
        return isset($haystack[$needle]) ? $haystack[$needle] : $default_value;
    }
    else {
    	// If it's not an array it must be an object
    	return isset($haystack->$needle) ? $haystack->$needle : $default_value;
    }
}

Hi
i put the file in helpers folder and call it in my controller like that
$this->load->helper ( 'MY_helper' );
$mm ['address'] = "something";
$this->load->view ( 'welcome_message', $mm );

and in my view
i try to get the value of address like this
echo get_key($mm, 'address');
but it gives error says

Undefined variable: mm

I'm afraid that has nothing to do with the helper function. You need to pass the variable to the view correctly :)

$this->load->view ( 'welcome_message', array('mm' => $mm );