<?php
/**
 * Sort an array of array, by a specific column in the sub-arrays
 *
 * $id$
 *
 * @file	function.array_columnsort.php
 * @author	Tobias H. michaelsen <thm-hide@address.com>
 * @date	2000-11-03
 *
 * @param	&$arr	Pointer to the array that is to be sorted
 * @param	$col	Name or index of the column to sort by
 */
function array_columnsort(&$arr, $col) {

	$GLOBALS['i3t27ftr4'] = $col;
	usort($arr, "custom_compare_function");

}

// {{{ custom compare function
function custom_compare_function($a, $b) {
	global $i3t27ftr4;

	if (!is_array($a) or !is_array($b)) {

		return 0;

	} elseif (is_string($a[$i3t27ftr4]) and is_string($b[$i3t27ftr4])) {

		return strnatcmp($a[$i3t27ftr4], $b[$i3t27ftr4]);

	} elseif (is_numeric($a[$i3t27ftr4]) and is_numeric($b[$i3t27ftr4])) {

		if ($a[$i3t27ftr4] == $b[$i3t27ftr4]) return 0;
		else return ($a[$i3t27ftr4] < $b[$i3t27ftr4]) ? -1 : 1;

	} else { // unknown type

		return 0;

	}
}
// }}}

/* vim: set tabstop=4: */
?>