Two approaches to de-duping a multi-dimensional array

super_unique.php

/*
	* Super Unique 
	*/
	public function super_unique(array $badarray)
	{

		$goodarray = array();

		foreach( $badarray as $ba )
		{
			$goodarray[ serialize($ba) ] = $ba;
		}

		$returnarray = array_values($goodarray);

		return $returnarray;

		/*

		$badarray = array(
			array('foo','bar'),	array('baz','boo'),	array('foo','bar'),	array('foo','bar'),	array('baz','boo'),
			array('biz','baa'),	array('foo','bar'),	array('baz','boo'),	array('foo','bar'),	array('foo','bar'),
			array('boo','baa'),	array('foo','bar'),	array('foo','bar'),	array('baz','boo'),	array('fop','bop')
		);

		*/

		$goodarray= array(); 

		$col1_ref = array();
		$col2_ref = array();
		
		$q = 0;

		foreach( $badarray as $row  )
		{

			$keys = array_keys($row);

			$dupeExists = false;
			for($j=0; $j < count($col1_ref); $j++)
			{
				if ( ($col1_ref[$j] == $row[$keys[0]])  && ($col2_ref[$j] == $row[$keys[1]]) ) 
				{
					$dupeExists = true;
				}
			}

			if(!$dupeExists)
			{
				$goodarray[] = $row;
			}

			$col1_ref[] = $row[$keys[0]];
			$col2_ref[] = $row[$keys[1]];

			$q++;
		}

		return $goodarray;
	}