in_array() function question

[r3gan]

Hi,

I have a question about PHP's in_array() function. Is there any way to have this function search for a particular value within an array that is inside another array? Here's some code to further explain my question:

$userArray = array(
  array("userName" => "jtodd", "firstName" => "James", "lastName" => "Todd"),
  array("userName" => "speters", "firstName" => "Sam", "lastName" => "Peters"),
  array("userName" => "tdunn", "firstName" => "Ted", "lastName" => "Dunn"),
  array("userName" => "bkyle", "firstName" => "Bill", "lastName" => "Kyle")
);
if (in_array("tdunn", $userArray)) {
  print "User found!";
}

Is there any way to use the in_array() function to search for a value of a sub array, or would I have to foreach() the $userArray variable and check every sub array with it's own in_array() function call?

[sid]

see comments at in_array()

[cgraz]

If you know which key of the multidimensional array you are searching in, it would be faster to do

if( isset( $userArray['userName']['tdunn'] ) )
{
	// Found
}

This works because you know that tdunn, if it exists, would exist in the userName key. If you don't have that information, then do as the last poster suggested - plenty of good functions in the manual.