note 93696 added to function.array-combine

From:	xavier at api-meal dot eu	Date:	Wed, 23 Sep 2009 10:37:58 +0000
Subject:	note 93696 added to function.array-combine
Groups:	php.notes
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<?php /** * Return alternatives defined by values of each parameters. * * Exemple : * * array_alternatives(array('foo','bar'), array('baz', 'qux')); * array( * array('foo', 'baz'), * array('bar', 'baz'), * array('foo', 'qux'), * array('bar', 'qux'), * ); * * array_alternatives(array('a'), array('simple-minded'), array('solution')); * array( * array('a', 'simple-minded', 'solution') * ); * * array_alternatives(array('a'), array('red', 'blue'), array('car')); * array( * array('a', 'red', 'car'), * array('a', 'blue', 'car'), * ); * * @param array $first_element * @param array $second_element * @return array * @author Xavier Barbosa */ function array_alternatives(array $first_element, array $second_element) { $lists = func_get_args(); $total_lists = func_num_args(); for($i=0; $i<$total_lists; $i++) { $list =& $lists[$i]; if (is_array($list) === FALSE) throw new Exception("Parameter $i is not an array."); if (count($list) === 0) throw new Exception("Parameter $i has no element."); unset($list); } // Initialize our alternatives $alternatives = array(); foreach($lists[0] as &$value) { array_push($alternatives, array($value)); unset($value); } unset($lists[0]); // Process alternatives for($i=1; $i<$total_lists; $i++) { $list =& $lists[$i]; $new_alternatives = array(); foreach($list as &$value) { foreach($alternatives as $_) { array_push($_, $value); array_push($new_alternatives, $_); } } // Rotate references, it's cheaper than copy array like

$alternatives =
$new_alternatives;