翻译强力驱动I have two arrays of the same length ($search_type, $search_term). I want to remove any duplicates in the sense of there being searches that have the same type and search term (ie $search_type[$a] == $search_type[$b] && $search_term[$a] == $search_term[$b]).
I'm aware that I could write this using loops, was wondering if there's a simpler (but equally efficient) way that takes advantage of built in functions?
Try either array_intersect() which will take two arrays and return an array where a value in array A exists in array B. Or array_diff() which does the opposite and returns an array of all values in A that don't exist in B.
Ok, here's an overly complex ad-hoc function foo() (lacking error handling, documentation and testing) that combines those two arrays. array_unique() takes care of the duplicates.
<?php $search_term = array('termA', 'termB', 'foo'=>'termC', 'bar'=>'termD', 'termB', 'termA'); $search_type= array('typeA', 'typeB', 'foo'=>'typeC', 'bar'=>'typeD', 'typeB', 'typeA'); $x = foo(array('term', $search_term), array('type', $search_type)); $x = array_unique($x, SORT_REGULAR); var_dump($x); function foo() { $rv = array(); $params = func_get_args(); foreach ( array_keys($params[0][1]) as $key ) { $rv[$key] = array(); foreach( $params as $p ) { $rv[$key][$p[0]] = $p[1][$key]; } } return $rv; }prints
array(4) { [0]=> array(2) { ["term"]=> string(5) "termA" ["type"]=> string(5) "typeA" } [1]=> array(2) { ["term"]=> string(5) "termB" ["type"]=> string(5) "typeB" } ["foo"]=> array(2) { ["term"]=> string(5) "termC" ["type"]=> string(5) "typeC" } ["bar"]=> array(2) { ["term"]=> string(5) "termD" ["type"]=> string(5) "typeD" } }It doesn't look like there's a simple way to solve the problem using just built-in functions.
This (at least logically) should work.
$search_terms = array('a', 'b', 'c', 'c', 'd', 'd'); $search_types = array( 1, 2, 3, 4, 5, 5); $terms = array_fill_keys($search_terms, array()); // Loop through them once and make an array of types for each term foreach ($search_terms as $i => $term) $terms[$term][] = $search_types[$i]; // Now we have $terms = array('a' => array(1), // 'b' => array(2), // 'c' => array(3, 4), // 'd' => array(5, 5) // ); // Now run through the array again and get rid of duplicates. foreach ($terms as $i => $types) $terms[$i] = array_unique($types);Edit: Here's a shorter and presumably more efficient one where you end up with a less pretty array:
$search_terms = array('a', 'b', 'c', 'c', 'd', 'd'); $search_types = array( 1, 2, 3, 4, 5, 5); $terms = array_fill_keys($search_terms, array()); // Loop through them once and make an array of types for each term foreach ($search_terms as $i => $term) $terms[$term][$search_types[$i]] = 1; // Now we have $terms = array('a' => array(1 => 1), // 'b' => array(2 => 1), // 'c' => array(3 => 1, 4 => 1), // 'd' => array(5 => 1) // );