how to use in_array

[omerbutt]

hi i need to compare a value inside the array that is returned via recordset from database

Array
(
    [0] => Array
        (
            [email] => ranatouqeer@msn.com
        )

    [1] => Array
        (
            [email] => omer@etgi.us
        )

)

i am trying to use in_array() to search inside the array but in_array() doesnt seem to do so here is the code
[code=php]
$email=$this->input->post('email' );
if(in_array($em ail,$newsletter _array)){
echo 'yes';
}else{
echo 'no';
}
[/code]
i have tried using it this way too

if(in_array(array(array('email'=>$email)),$newsletter_array)){
			echo 'yes';
		}else{
			echo 'no';
		}

what am i doing wrong
regards,
Omer Aslam

[omerbutt]

i did it by using the following method

function array_value_recursive($key, array $arr){
		$val = array();
		@array_walk_recursive($arr, function($v, $k) use($key, &$val){ if($k == $key) array_push($val, $v);});
		return count($val) > 1 ? $val : array_pop($val);
	}
$new_array=array_value_recursive('email',$newsletter_array);

			if(in_array($email,$new_array)){
echo 'matched';
}else{
echo 'not found';
}

regards,
Omer Aslam